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<h1 id="c-collections">C# Collections</h1>
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<h2 id="arrays">Arrays</h2>
|
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<p>An array is an object that contains multiple elements of a particular type. The number of elements is fixed for the lifetime of the array, so it must be specified when the array is created.</p>
|
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<p>An array type is always a reference type, regardless of the element type. Nonetheless, the choice between reference type and value type elements makes a significant difference in an array's behavior.</p>
|
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<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">C#</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-0-1"> 1</a></span>
|
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<span class="normal"><a href="#__codelineno-0-2"> 2</a></span>
|
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<span class="normal"><a href="#__codelineno-0-3"> 3</a></span>
|
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<span class="normal"><a href="#__codelineno-0-4"> 4</a></span>
|
|
<span class="normal"><a href="#__codelineno-0-5"> 5</a></span>
|
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<span class="normal"><a href="#__codelineno-0-6"> 6</a></span>
|
|
<span class="normal"><a href="#__codelineno-0-7"> 7</a></span>
|
|
<span class="normal"><a href="#__codelineno-0-8"> 8</a></span>
|
|
<span class="normal"><a href="#__codelineno-0-9"> 9</a></span>
|
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<span class="normal"><a href="#__codelineno-0-10">10</a></span>
|
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<span class="normal"><a href="#__codelineno-0-11">11</a></span>
|
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<span class="normal"><a href="#__codelineno-0-12">12</a></span>
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<span class="normal"><a href="#__codelineno-0-13">13</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1"></a><span class="n">type</span><span class="p">[]</span><span class="w"> </span><span class="n">array</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">type</span><span class="p">[</span><span class="n">dimension</span><span class="p">];</span>
|
|
<a id="__codelineno-0-2" name="__codelineno-0-2"></a><span class="n">type</span><span class="w"> </span><span class="n">array</span><span class="p">[]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">type</span><span class="p">[</span><span class="n">dimension</span><span class="p">];</span><span class="w"> </span><span class="c1">//invalid</span>
|
|
<a id="__codelineno-0-3" name="__codelineno-0-3"></a>
|
|
<a id="__codelineno-0-4" name="__codelineno-0-4"></a><span class="n">type</span><span class="p">[]</span><span class="w"> </span><span class="n">array</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="n">value1</span><span class="p">,</span><span class="w"> </span><span class="n">value2</span><span class="p">,</span><span class="w"> </span><span class="p">...,</span><span class="w"> </span><span class="n">valueN</span><span class="p">};</span><span class="w"> </span><span class="c1">// initializer</span>
|
|
<a id="__codelineno-0-5" name="__codelineno-0-5"></a><span class="kt">var</span><span class="w"> </span><span class="n">array</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">type</span><span class="p">[]</span><span class="w"> </span><span class="p">{</span><span class="n">value1</span><span class="p">,</span><span class="w"> </span><span class="n">value2</span><span class="p">,</span><span class="w"> </span><span class="p">...,</span><span class="w"> </span><span class="n">valueN</span><span class="p">};</span><span class="w"> </span><span class="c1">// initializer (var type needs new operator)</span>
|
|
<a id="__codelineno-0-6" name="__codelineno-0-6"></a><span class="kt">var</span><span class="w"> </span><span class="n">array</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="p">[]</span><span class="w"> </span><span class="p">{</span><span class="n">value1</span><span class="p">,</span><span class="w"> </span><span class="n">value2</span><span class="p">,</span><span class="w"> </span><span class="p">...,</span><span class="w"> </span><span class="n">valueN</span><span class="p">};</span><span class="w"> </span><span class="c1">// initializer w/ element type inference (var type needs new operator), can be used as method arg</span>
|
|
<a id="__codelineno-0-7" name="__codelineno-0-7"></a>
|
|
<a id="__codelineno-0-8" name="__codelineno-0-8"></a><span class="n">array</span><span class="p">[</span><span class="n">index</span><span class="p">];</span><span class="w"> </span><span class="c1">// value access</span>
|
|
<a id="__codelineno-0-9" name="__codelineno-0-9"></a><span class="n">array</span><span class="p">[</span><span class="n">index</span><span class="p">]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">value</span><span class="p">;</span><span class="w"> </span><span class="c1">// value assignment</span>
|
|
<a id="__codelineno-0-10" name="__codelineno-0-10"></a><span class="n">array</span><span class="p">.</span><span class="n">Length</span><span class="p">;</span><span class="w"> </span><span class="c1">// dimension of the array</span>
|
|
<a id="__codelineno-0-11" name="__codelineno-0-11"></a>
|
|
<a id="__codelineno-0-12" name="__codelineno-0-12"></a><span class="c1">// from IEnumerable<T></span>
|
|
<a id="__codelineno-0-13" name="__codelineno-0-13"></a><span class="n">array</span><span class="p">.</span><span class="n">OfType</span><span class="o"><</span><span class="n">Type</span><span class="o">></span><span class="p">();</span><span class="w"> </span><span class="c1">// filter array based on type, returns IEnumerable<Type></span>
|
|
</code></pre></div></td></tr></table></div>
|
|
<h3 id="array-methods"><a href="https://docs.microsoft.com/en-us/dotnet/api/system.array?view=netcore-3.1#methods">Array Methods</a></h3>
|
|
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">C#</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-1-1"> 1</a></span>
|
|
<span class="normal"><a href="#__codelineno-1-2"> 2</a></span>
|
|
<span class="normal"><a href="#__codelineno-1-3"> 3</a></span>
|
|
<span class="normal"><a href="#__codelineno-1-4"> 4</a></span>
|
|
<span class="normal"><a href="#__codelineno-1-5"> 5</a></span>
|
|
<span class="normal"><a href="#__codelineno-1-6"> 6</a></span>
|
|
<span class="normal"><a href="#__codelineno-1-7"> 7</a></span>
|
|
<span class="normal"><a href="#__codelineno-1-8"> 8</a></span>
|
|
<span class="normal"><a href="#__codelineno-1-9"> 9</a></span>
|
|
<span class="normal"><a href="#__codelineno-1-10">10</a></span>
|
|
<span class="normal"><a href="#__codelineno-1-11">11</a></span>
|
|
<span class="normal"><a href="#__codelineno-1-12">12</a></span>
|
|
<span class="normal"><a href="#__codelineno-1-13">13</a></span>
|
|
<span class="normal"><a href="#__codelineno-1-14">14</a></span>
|
|
<span class="normal"><a href="#__codelineno-1-15">15</a></span>
|
|
<span class="normal"><a href="#__codelineno-1-16">16</a></span>
|
|
<span class="normal"><a href="#__codelineno-1-17">17</a></span>
|
|
<span class="normal"><a href="#__codelineno-1-18">18</a></span>
|
|
<span class="normal"><a href="#__codelineno-1-19">19</a></span>
|
|
<span class="normal"><a href="#__codelineno-1-20">20</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1"></a><span class="c1">// overloaded search methods</span>
|
|
<a id="__codelineno-1-2" name="__codelineno-1-2"></a><span class="n">Array</span><span class="p">.</span><span class="n">IndexOf</span><span class="p">(</span><span class="n">array</span><span class="p">,</span><span class="w"> </span><span class="n">item</span><span class="p">);</span><span class="w"> </span><span class="c1">// return index of searched item in passed array</span>
|
|
<a id="__codelineno-1-3" name="__codelineno-1-3"></a><span class="n">Array</span><span class="p">.</span><span class="n">LastIndexOf</span><span class="p">(</span><span class="n">array</span><span class="p">,</span><span class="w"> </span><span class="n">item</span><span class="p">);</span><span class="w"> </span><span class="c1">// return index of searched item staring from the end of the array</span>
|
|
<a id="__codelineno-1-4" name="__codelineno-1-4"></a><span class="n">Array</span><span class="p">.</span><span class="n">FindIndex</span><span class="p">(</span><span class="n">array</span><span class="p">,</span><span class="w"> </span><span class="n">Predicate</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">)</span><span class="w"> </span><span class="c1">// returns the index of the first item matching the predicate (can be lambda function)</span>
|
|
<a id="__codelineno-1-5" name="__codelineno-1-5"></a><span class="n">Array</span><span class="p">.</span><span class="n">FindLastIndex</span><span class="p">(</span><span class="n">array</span><span class="p">,</span><span class="w"> </span><span class="n">Predicate</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">)</span><span class="w"> </span><span class="c1">// returns the index of the last item matching the predicate (can be lambda function)</span>
|
|
<a id="__codelineno-1-6" name="__codelineno-1-6"></a><span class="n">Array</span><span class="p">.</span><span class="n">Find</span><span class="p">(</span><span class="n">array</span><span class="p">,</span><span class="w"> </span><span class="n">Predicate</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">)</span><span class="w"> </span><span class="c1">// returns the value of the first item matching the predicate (can be lambda function)</span>
|
|
<a id="__codelineno-1-7" name="__codelineno-1-7"></a><span class="n">Array</span><span class="p">.</span><span class="n">FindLast</span><span class="p">(</span><span class="n">array</span><span class="p">,</span><span class="w"> </span><span class="n">Predicate</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">)</span><span class="w"> </span><span class="c1">// returns the value of the last item matching the predicate (can be lambda function)</span>
|
|
<a id="__codelineno-1-8" name="__codelineno-1-8"></a><span class="n">Array</span><span class="p">.</span><span class="n">FindAll</span><span class="p">(</span><span class="n">array</span><span class="p">,</span><span class="w"> </span><span class="n">Predicate</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">)</span><span class="w"> </span><span class="c1">// returns array of all items matching the predicate (can be lambda function)</span>
|
|
<a id="__codelineno-1-9" name="__codelineno-1-9"></a><span class="n">Array</span><span class="p">.</span><span class="n">BinarySearch</span><span class="p">(</span><span class="n">array</span><span class="p">,</span><span class="w"> </span><span class="k">value</span><span class="p">)</span><span class="w"> </span><span class="c1">// Searches a SORTED array for a value, using a binary search algorithm; returns the index of the found item</span>
|
|
<a id="__codelineno-1-10" name="__codelineno-1-10"></a>
|
|
<a id="__codelineno-1-11" name="__codelineno-1-11"></a><span class="n">Array</span><span class="p">.</span><span class="n">Sort</span><span class="p">(</span><span class="n">array</span><span class="p">);</span>
|
|
<a id="__codelineno-1-12" name="__codelineno-1-12"></a><span class="n">Array</span><span class="p">.</span><span class="n">Reverse</span><span class="p">(</span><span class="n">array</span><span class="p">);</span><span class="w"> </span><span class="c1">// reverses the order of array elements</span>
|
|
<a id="__codelineno-1-13" name="__codelineno-1-13"></a><span class="n">Array</span><span class="p">.</span><span class="n">Clear</span><span class="p">(</span><span class="n">start_index</span><span class="p">,</span><span class="w"> </span><span class="n">x</span><span class="p">);</span><span class="w"> </span><span class="c1">//removes reference to x elements starting at start index. Dimension of array unchanged (cleared elements value is set tu null)</span>
|
|
<a id="__codelineno-1-14" name="__codelineno-1-14"></a><span class="n">Array</span><span class="p">.</span><span class="n">Resize</span><span class="p">(</span><span class="k">ref</span><span class="w"> </span><span class="n">array</span><span class="p">,</span><span class="w"> </span><span class="n">target_dimension</span><span class="p">);</span><span class="w"> </span><span class="c1">//expands or shrinks the array dimension. Shrinking drops trailing values. Array passed by reference.</span>
|
|
<a id="__codelineno-1-15" name="__codelineno-1-15"></a>
|
|
<a id="__codelineno-1-16" name="__codelineno-1-16"></a><span class="c1">// Copies elements from an Array starting at the specified index and pastes them to another Array starting at the specified destination index.</span>
|
|
<a id="__codelineno-1-17" name="__codelineno-1-17"></a><span class="n">Array</span><span class="p">.</span><span class="n">Copy</span><span class="p">(</span><span class="n">sourceArray</span><span class="p">,</span><span class="w"> </span><span class="n">sourceStartIndex</span><span class="p">,</span><span class="w"> </span><span class="n">destinationArray</span><span class="p">,</span><span class="w"> </span><span class="n">destinationStartIndex</span><span class="p">,</span><span class="w"> </span><span class="n">numItemsToCopy</span><span class="p">);</span>
|
|
<a id="__codelineno-1-18" name="__codelineno-1-18"></a><span class="c1">// Copies elements from an Array starting at the first element and pastes them into another Array starting at the first element.</span>
|
|
<a id="__codelineno-1-19" name="__codelineno-1-19"></a><span class="n">Array</span><span class="p">.</span><span class="n">Copy</span><span class="p">(</span><span class="n">sourceArray</span><span class="p">,</span><span class="w"> </span><span class="n">destinationArray</span><span class="p">,</span><span class="w"> </span><span class="n">numItemsToCopy</span><span class="p">);</span>
|
|
<a id="__codelineno-1-20" name="__codelineno-1-20"></a><span class="n">Array</span><span class="p">.</span><span class="n">Clone</span><span class="p">();</span><span class="w"> </span><span class="c1">// returns a shallow copy of the array</span>
|
|
</code></pre></div></td></tr></table></div>
|
|
<h3 id="multidimensional-arrays">Multidimensional Arrays</h3>
|
|
<p>C# supports two multidimensional array forms: <a href="https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/arrays/jagged-arrays">jagged</a> arrays and <a href="https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/arrays/multidimensional-arrays">rectangular</a> arrays (<em>matrices</em>).</p>
|
|
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">C#</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-2-1"> 1</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-2"> 2</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-3"> 3</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-4"> 4</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-5"> 5</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-6"> 6</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-7"> 7</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-8"> 8</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-9"> 9</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-10">10</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-11">11</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-12">12</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-13">13</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-14">14</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-15">15</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-16">16</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-17">17</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-18">18</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-19">19</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-20">20</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-21">21</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-22">22</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-23">23</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-24">24</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-25">25</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-26">26</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1"></a><span class="c1">//specify first dimension</span>
|
|
<a id="__codelineno-2-2" name="__codelineno-2-2"></a><span class="n">type</span><span class="p">[][]</span><span class="w"> </span><span class="n">jagged</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">type</span><span class="p">[][]</span>
|
|
<a id="__codelineno-2-3" name="__codelineno-2-3"></a><span class="p">{</span>
|
|
<a id="__codelineno-2-4" name="__codelineno-2-4"></a><span class="w"> </span><span class="k">new</span><span class="p">[]</span><span class="w"> </span><span class="p">{</span><span class="n">item1</span><span class="p">,</span><span class="w"> </span><span class="n">item2</span><span class="p">,</span><span class="w"> </span><span class="n">item3</span><span class="p">},</span>
|
|
<a id="__codelineno-2-5" name="__codelineno-2-5"></a><span class="w"> </span><span class="k">new</span><span class="p">[]</span><span class="w"> </span><span class="p">{</span><span class="n">item1</span><span class="p">},</span>
|
|
<a id="__codelineno-2-6" name="__codelineno-2-6"></a><span class="w"> </span><span class="k">new</span><span class="p">[]</span><span class="w"> </span><span class="p">{</span><span class="n">item1</span><span class="p">,</span><span class="w"> </span><span class="n">item2</span><span class="p">},</span>
|
|
<a id="__codelineno-2-7" name="__codelineno-2-7"></a><span class="w"> </span><span class="p">...</span>
|
|
<a id="__codelineno-2-8" name="__codelineno-2-8"></a><span class="p">}</span>
|
|
<a id="__codelineno-2-9" name="__codelineno-2-9"></a>
|
|
<a id="__codelineno-2-10" name="__codelineno-2-10"></a><span class="c1">// shorthand</span>
|
|
<a id="__codelineno-2-11" name="__codelineno-2-11"></a><span class="n">type</span><span class="p">[][]</span><span class="w"> </span><span class="n">jagged</span><span class="w"> </span><span class="o">=</span>
|
|
<a id="__codelineno-2-12" name="__codelineno-2-12"></a><span class="p">{</span>
|
|
<a id="__codelineno-2-13" name="__codelineno-2-13"></a><span class="w"> </span><span class="k">new</span><span class="p">[]</span><span class="w"> </span><span class="p">{</span><span class="n">item1</span><span class="p">,</span><span class="w"> </span><span class="n">item2</span><span class="p">,</span><span class="w"> </span><span class="n">item3</span><span class="p">},</span>
|
|
<a id="__codelineno-2-14" name="__codelineno-2-14"></a><span class="w"> </span><span class="k">new</span><span class="p">[]</span><span class="w"> </span><span class="p">{</span><span class="n">item1</span><span class="p">},</span>
|
|
<a id="__codelineno-2-15" name="__codelineno-2-15"></a><span class="w"> </span><span class="k">new</span><span class="p">[]</span><span class="w"> </span><span class="p">{</span><span class="n">item1</span><span class="p">,</span><span class="w"> </span><span class="n">item2</span><span class="p">},</span>
|
|
<a id="__codelineno-2-16" name="__codelineno-2-16"></a><span class="w"> </span><span class="p">...</span>
|
|
<a id="__codelineno-2-17" name="__codelineno-2-17"></a><span class="p">}</span>
|
|
<a id="__codelineno-2-18" name="__codelineno-2-18"></a>
|
|
<a id="__codelineno-2-19" name="__codelineno-2-19"></a><span class="c1">// matrices</span>
|
|
<a id="__codelineno-2-20" name="__codelineno-2-20"></a><span class="n">type</span><span class="p">[,]</span><span class="w"> </span><span class="n">matrix</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">type</span><span class="p">[</span><span class="n">n</span><span class="p">,</span><span class="w"> </span><span class="n">m</span><span class="p">];</span><span class="w"> </span><span class="c1">// n * m matrix</span>
|
|
<a id="__codelineno-2-21" name="__codelineno-2-21"></a><span class="n">type</span><span class="p">[,]</span><span class="w"> </span><span class="n">matrix</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{{},</span><span class="w"> </span><span class="p">{},</span><span class="w"> </span><span class="p">{},</span><span class="w"> </span><span class="p">...};</span><span class="w"> </span><span class="c1">// {} for each row to initialize</span>
|
|
<a id="__codelineno-2-22" name="__codelineno-2-22"></a><span class="n">type</span><span class="p">[,</span><span class="w"> </span><span class="p">,]</span><span class="w"> </span><span class="n">tensor</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">type</span><span class="p">[</span><span class="n">n</span><span class="p">,</span><span class="w"> </span><span class="n">m</span><span class="p">,</span><span class="w"> </span><span class="n">o</span><span class="p">]</span><span class="w"> </span><span class="c1">// n * m * o tensor</span>
|
|
<a id="__codelineno-2-23" name="__codelineno-2-23"></a>
|
|
<a id="__codelineno-2-24" name="__codelineno-2-24"></a><span class="n">matrix</span><span class="p">.</span><span class="n">Length</span><span class="p">;</span><span class="w"> </span><span class="c1">// total number of elements (n * m)</span>
|
|
<a id="__codelineno-2-25" name="__codelineno-2-25"></a><span class="n">matrix</span><span class="p">.</span><span class="n">GetLength</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">dimension</span><span class="p">);</span><span class="w"> </span><span class="c1">// get the size of a particular direction</span>
|
|
<a id="__codelineno-2-26" name="__codelineno-2-26"></a><span class="c1">// row = 0, column = 1, ...</span>
|
|
</code></pre></div></td></tr></table></div>
|
|
<h2 id="lists"><a href="https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.list-1">Lists</a></h2>
|
|
<p><code>List<T></code> stores sequences of elements. It can grow or shrink, allowing to add or remove elements.</p>
|
|
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">C#</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-3-1"> 1</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-2"> 2</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-3"> 3</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-4"> 4</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-5"> 5</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-6"> 6</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-7"> 7</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-8"> 8</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-9"> 9</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-10">10</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-11">11</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-12">12</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-13">13</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-14">14</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-15">15</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-16">16</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-17">17</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-18">18</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-19">19</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-20">20</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-21">21</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-22">22</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-23">23</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-24">24</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-25">25</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-26">26</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-27">27</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-28">28</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-29">29</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-30">30</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-31">31</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-32">32</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-33">33</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-34">34</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-35">35</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-36">36</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-37">37</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-38">38</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-39">39</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-3-1" name="__codelineno-3-1"></a><span class="k">using</span><span class="w"> </span><span class="nn">System.Collections.Generics</span><span class="p">;</span>
|
|
<a id="__codelineno-3-2" name="__codelineno-3-2"></a>
|
|
<a id="__codelineno-3-3" name="__codelineno-3-3"></a><span class="n">List</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="n">list</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">List</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">();</span>
|
|
<a id="__codelineno-3-4" name="__codelineno-3-4"></a><span class="n">List</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="n">list</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">List</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="p">{</span><span class="n">item_1</span><span class="p">,</span><span class="w"> </span><span class="p">...};</span><span class="w"> </span><span class="c1">// initialized usable since list implements IEnumerable<T> and has Add() method (even extension method)</span>
|
|
<a id="__codelineno-3-5" name="__codelineno-3-5"></a><span class="n">List</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="n">list</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">List</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">(</span><span class="n">dimension</span><span class="p">);</span><span class="w"> </span><span class="c1">// set list starting dimension</span>
|
|
<a id="__codelineno-3-6" name="__codelineno-3-6"></a><span class="n">List</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="n">list</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">List</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">(</span><span class="n">IEnumerable</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">);</span><span class="w"> </span><span class="c1">// create a list from an enumerable collection</span>
|
|
<a id="__codelineno-3-7" name="__codelineno-3-7"></a>
|
|
<a id="__codelineno-3-8" name="__codelineno-3-8"></a>
|
|
<a id="__codelineno-3-9" name="__codelineno-3-9"></a><span class="n">list</span><span class="p">.</span><span class="n">Add</span><span class="p">(</span><span class="n">item</span><span class="p">);</span><span class="w"> </span><span class="c1">//item insertion into the list</span>
|
|
<a id="__codelineno-3-10" name="__codelineno-3-10"></a><span class="n">list</span><span class="p">.</span><span class="n">AddRange</span><span class="p">(</span><span class="n">IEnumerable</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="n">collection</span><span class="p">);</span><span class="w"> </span><span class="c1">// insert multiple items</span>
|
|
<a id="__codelineno-3-11" name="__codelineno-3-11"></a><span class="n">list</span><span class="p">.</span><span class="n">Insert</span><span class="p">(</span><span class="n">index</span><span class="p">,</span><span class="w"> </span><span class="n">item</span><span class="p">);</span><span class="w"> </span><span class="c1">// insert an item at the specified index</span>
|
|
<a id="__codelineno-3-12" name="__codelineno-3-12"></a><span class="n">list</span><span class="p">.</span><span class="n">InsertRange</span><span class="p">(</span><span class="n">index</span><span class="p">,</span><span class="w"> </span><span class="n">item</span><span class="p">);</span><span class="w"> </span><span class="c1">// insert items at the specified index</span>
|
|
<a id="__codelineno-3-13" name="__codelineno-3-13"></a>
|
|
<a id="__codelineno-3-14" name="__codelineno-3-14"></a><span class="n">list</span><span class="p">.</span><span class="n">IndexOf</span><span class="p">(</span><span class="n">item</span><span class="p">);</span><span class="w"> </span><span class="c1">// return index of searched item in passed list</span>
|
|
<a id="__codelineno-3-15" name="__codelineno-3-15"></a><span class="n">list</span><span class="p">.</span><span class="n">LastIndexOf</span><span class="p">(</span><span class="n">item</span><span class="p">);</span><span class="w"> </span><span class="c1">// return index of searched item staring from the end of the array</span>
|
|
<a id="__codelineno-3-16" name="__codelineno-3-16"></a><span class="n">list</span><span class="p">.</span><span class="n">FindIndex</span><span class="p">(</span><span class="n">Predicate</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">)</span><span class="w"> </span><span class="c1">// returns the index of the first item matching the predicate (can be lambda function)</span>
|
|
<a id="__codelineno-3-17" name="__codelineno-3-17"></a><span class="n">list</span><span class="p">.</span><span class="n">FindLastIndex</span><span class="p">(</span><span class="n">Predicate</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">)</span><span class="w"> </span><span class="c1">// returns the index of the last item matching the predicate (can be lambda function)</span>
|
|
<a id="__codelineno-3-18" name="__codelineno-3-18"></a><span class="n">list</span><span class="p">.</span><span class="n">Find</span><span class="p">(</span><span class="n">Predicate</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">)</span><span class="w"> </span><span class="c1">// returns the value of the first item matching the predicate (can be lambda function)</span>
|
|
<a id="__codelineno-3-19" name="__codelineno-3-19"></a><span class="n">list</span><span class="p">.</span><span class="n">FindLast</span><span class="p">(</span><span class="n">Predicate</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">)</span><span class="w"> </span><span class="c1">// returns the value of the last item matching the predicate (can be lambda function)</span>
|
|
<a id="__codelineno-3-20" name="__codelineno-3-20"></a><span class="n">list</span><span class="p">.</span><span class="n">FindAll</span><span class="p">(</span><span class="n">Predicate</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">)</span><span class="w"> </span><span class="c1">// returns list of all items matching the predicate (can be lambda function)</span>
|
|
<a id="__codelineno-3-21" name="__codelineno-3-21"></a><span class="n">list</span><span class="p">.</span><span class="n">BinarySearch</span><span class="p">(</span><span class="k">value</span><span class="p">)</span><span class="w"> </span><span class="c1">// Searches a SORTED list for a value, using a binary search algorithm; returns the index of the found item</span>
|
|
<a id="__codelineno-3-22" name="__codelineno-3-22"></a>
|
|
<a id="__codelineno-3-23" name="__codelineno-3-23"></a><span class="n">list</span><span class="p">.</span><span class="n">Remove</span><span class="p">(</span><span class="n">item</span><span class="p">);</span><span class="w"> </span><span class="c1">// remove item from list</span>
|
|
<a id="__codelineno-3-24" name="__codelineno-3-24"></a><span class="n">list</span><span class="p">.</span><span class="n">RemoveAt</span><span class="p">(</span><span class="n">index</span><span class="p">);</span><span class="w"> </span><span class="c1">// remove item at specified position</span>
|
|
<a id="__codelineno-3-25" name="__codelineno-3-25"></a><span class="n">list</span><span class="p">.</span><span class="n">RemoveRange</span><span class="p">(</span><span class="n">index</span><span class="p">,</span><span class="w"> </span><span class="n">quantity</span><span class="p">);</span><span class="w"> </span><span class="c1">// remove quantity items at specified position</span>
|
|
<a id="__codelineno-3-26" name="__codelineno-3-26"></a>
|
|
<a id="__codelineno-3-27" name="__codelineno-3-27"></a><span class="n">list</span><span class="p">.</span><span class="n">Contains</span><span class="p">(</span><span class="n">item</span><span class="p">);</span><span class="w"> </span><span class="c1">// check if item is in the list</span>
|
|
<a id="__codelineno-3-28" name="__codelineno-3-28"></a><span class="n">list</span><span class="p">.</span><span class="n">TrueForAll</span><span class="p">(</span><span class="n">Predicate</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">);</span><span class="w"> </span><span class="c1">// Determines whether every element matches the conditions defined by the specified predicate</span>
|
|
<a id="__codelineno-3-29" name="__codelineno-3-29"></a>
|
|
<a id="__codelineno-3-30" name="__codelineno-3-30"></a><span class="n">list</span><span class="p">[</span><span class="n">index</span><span class="p">];</span><span class="w"> </span><span class="c1">// access to items by index</span>
|
|
<a id="__codelineno-3-31" name="__codelineno-3-31"></a><span class="n">list</span><span class="p">[</span><span class="n">index</span><span class="p">]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">value</span><span class="p">;</span><span class="w"> </span><span class="c1">// modify to items by index</span>
|
|
<a id="__codelineno-3-32" name="__codelineno-3-32"></a><span class="n">list</span><span class="p">.</span><span class="n">Count</span><span class="p">;</span><span class="w"> </span><span class="c1">// number of items in the list</span>
|
|
<a id="__codelineno-3-33" name="__codelineno-3-33"></a>
|
|
<a id="__codelineno-3-34" name="__codelineno-3-34"></a><span class="n">list</span><span class="p">.</span><span class="n">Sort</span><span class="p">();</span><span class="w"> </span><span class="c1">// sorts item in crescent order</span>
|
|
<a id="__codelineno-3-35" name="__codelineno-3-35"></a><span class="n">list</span><span class="p">.</span><span class="n">Reverse</span><span class="p">();</span><span class="w"> </span><span class="c1">// Reverses the order of the elements in the list</span>
|
|
<a id="__codelineno-3-36" name="__codelineno-3-36"></a>
|
|
<a id="__codelineno-3-37" name="__codelineno-3-37"></a><span class="c1">// from IEnumerable<T></span>
|
|
<a id="__codelineno-3-38" name="__codelineno-3-38"></a><span class="n">list</span><span class="p">.</span><span class="n">OfType</span><span class="o"><</span><span class="n">Type</span><span class="o">></span><span class="p">();</span><span class="w"> </span><span class="c1">// filter list based on type, returns IEnumerable<Type></span>
|
|
<a id="__codelineno-3-39" name="__codelineno-3-39"></a><span class="n">list</span><span class="p">.</span><span class="n">OfType</span><span class="o"><</span><span class="n">Type</span><span class="o">></span><span class="p">().</span><span class="n">ToList</span><span class="p">();</span><span class="w"> </span><span class="c1">// filter list based on type, returns List<Type></span>
|
|
</code></pre></div></td></tr></table></div>
|
|
<h2 id="iterators"><a href="https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/concepts/iterators">Iterators</a></h2>
|
|
<p>An iterator can be used to step through collections such as lists and arrays.</p>
|
|
<p>An iterator method or <code>get</code> accessor performs a custom iteration over a collection. An iterator method uses the <code>yield return</code> statement to return each element one at a time.
|
|
When a <code>yield return</code> statement is reached, the current location in code is remembered. Execution is restarted from that location the next time the iterator function is called.</p>
|
|
<p>It's possible to use a <code>yield break</code> statement or exception to end the iteration.</p>
|
|
<p><strong>Note</strong>: Since an iterator returns an <code>IEnumerable<T></code> is can be used to implement a <code>GetEnumerator()</code>.</p>
|
|
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">C#</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-4-1">1</a></span>
|
|
<span class="normal"><a href="#__codelineno-4-2">2</a></span>
|
|
<span class="normal"><a href="#__codelineno-4-3">3</a></span>
|
|
<span class="normal"><a href="#__codelineno-4-4">4</a></span>
|
|
<span class="normal"><a href="#__codelineno-4-5">5</a></span>
|
|
<span class="normal"><a href="#__codelineno-4-6">6</a></span>
|
|
<span class="normal"><a href="#__codelineno-4-7">7</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-4-1" name="__codelineno-4-1"></a><span class="c1">// simple iterator</span>
|
|
<a id="__codelineno-4-2" name="__codelineno-4-2"></a><span class="k">public</span><span class="w"> </span><span class="k">static</span><span class="w"> </span><span class="n">System</span><span class="p">.</span><span class="n">Collections</span><span class="p">.</span><span class="n">IEnumerable</span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="n">IterateRange</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">start</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="m">0</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">end</span><span class="p">)</span>
|
|
<a id="__codelineno-4-3" name="__codelineno-4-3"></a><span class="p">{</span>
|
|
<a id="__codelineno-4-4" name="__codelineno-4-4"></a><span class="w"> </span><span class="k">for</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">start</span><span class="p">;</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o"><</span><span class="w"> </span><span class="n">end</span><span class="p">;</span><span class="w"> </span><span class="n">i</span><span class="o">++</span><span class="p">){</span>
|
|
<a id="__codelineno-4-5" name="__codelineno-4-5"></a><span class="w"> </span><span class="k">yield</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">i</span><span class="p">;</span>
|
|
<a id="__codelineno-4-6" name="__codelineno-4-6"></a><span class="w"> </span><span class="p">}</span>
|
|
<a id="__codelineno-4-7" name="__codelineno-4-7"></a><span class="p">}</span>
|
|
</code></pre></div></td></tr></table></div>
|
|
<h2 id="list-sequence-interfaces">List & Sequence Interfaces</h2>
|
|
<h3 id="ienumerablet"><a href="https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.ienumerable-1"><code>IEnumerable<T></code></a></h3>
|
|
<p>Exposes the enumerator, which supports a simple iteration over a collection of a specified type.</p>
|
|
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">C#</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-5-1"> 1</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-2"> 2</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-3"> 3</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-4"> 4</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-5"> 5</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-6"> 6</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-7"> 7</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-8"> 8</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-9"> 9</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-10">10</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-11">11</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-12">12</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-13">13</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-14">14</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-15">15</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-16">16</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-5-1" name="__codelineno-5-1"></a><span class="k">public</span><span class="w"> </span><span class="k">interface</span><span class="w"> </span><span class="n">IEnumerable</span><span class="o"><</span><span class="k">out</span><span class="w"> </span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="n">IEnumerable</span>
|
|
<a id="__codelineno-5-2" name="__codelineno-5-2"></a><span class="p">{</span>
|
|
<a id="__codelineno-5-3" name="__codelineno-5-3"></a><span class="w"> </span><span class="n">IEnumerator</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="n">GetEnumerator</span><span class="p">();</span><span class="w"> </span><span class="c1">// return an enumerator</span>
|
|
<a id="__codelineno-5-4" name="__codelineno-5-4"></a><span class="p">}</span>
|
|
<a id="__codelineno-5-5" name="__codelineno-5-5"></a>
|
|
<a id="__codelineno-5-6" name="__codelineno-5-6"></a><span class="c1">// iterate through a collection</span>
|
|
<a id="__codelineno-5-7" name="__codelineno-5-7"></a><span class="k">public</span><span class="w"> </span><span class="k">interface</span><span class="w"> </span><span class="n">IEnumerator</span><span class="o"><</span><span class="n">T</span><span class="o">></span>
|
|
<a id="__codelineno-5-8" name="__codelineno-5-8"></a><span class="p">{</span>
|
|
<a id="__codelineno-5-9" name="__codelineno-5-9"></a><span class="w"> </span><span class="c1">// properties</span>
|
|
<a id="__codelineno-5-10" name="__codelineno-5-10"></a><span class="w"> </span><span class="kt">object</span><span class="w"> </span><span class="n">Current</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">get</span><span class="p">;</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="c1">// Get the element in the collection at the current position of the enumerator.</span>
|
|
<a id="__codelineno-5-11" name="__codelineno-5-11"></a>
|
|
<a id="__codelineno-5-12" name="__codelineno-5-12"></a><span class="w"> </span><span class="c1">// methods</span>
|
|
<a id="__codelineno-5-13" name="__codelineno-5-13"></a><span class="w"> </span><span class="k">void</span><span class="w"> </span><span class="n">IDisposable</span><span class="p">.</span><span class="n">Dispose</span><span class="p">();</span><span class="w"> </span><span class="c1">// Perform application-defined tasks associated with freeing, releasing, or resetting unmanaged resources</span>
|
|
<a id="__codelineno-5-14" name="__codelineno-5-14"></a><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="nf">MoveNext</span><span class="p">();</span><span class="w"> </span><span class="c1">// Advance the enumerator to the next element of the collection.</span>
|
|
<a id="__codelineno-5-15" name="__codelineno-5-15"></a><span class="w"> </span><span class="k">void</span><span class="w"> </span><span class="nf">Reset</span><span class="p">();</span><span class="w"> </span><span class="c1">// Set the enumerator to its initial position, which is before the first element in the collection.</span>
|
|
<a id="__codelineno-5-16" name="__codelineno-5-16"></a><span class="p">}</span>
|
|
</code></pre></div></td></tr></table></div>
|
|
<p><strong>Note</strong>: must call <code>Dispose()</code> on enumerators once finished with them, because many of them rely on this. <code>Reset()</code> is legacy and can, in some situations, throw <code>NotSupportedException()</code>.</p>
|
|
<h3 id="icollectiont"><a href="https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.icollection-1"><code>ICollection<T></code></a></h3>
|
|
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">C#</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-6-1"> 1</a></span>
|
|
<span class="normal"><a href="#__codelineno-6-2"> 2</a></span>
|
|
<span class="normal"><a href="#__codelineno-6-3"> 3</a></span>
|
|
<span class="normal"><a href="#__codelineno-6-4"> 4</a></span>
|
|
<span class="normal"><a href="#__codelineno-6-5"> 5</a></span>
|
|
<span class="normal"><a href="#__codelineno-6-6"> 6</a></span>
|
|
<span class="normal"><a href="#__codelineno-6-7"> 7</a></span>
|
|
<span class="normal"><a href="#__codelineno-6-8"> 8</a></span>
|
|
<span class="normal"><a href="#__codelineno-6-9"> 9</a></span>
|
|
<span class="normal"><a href="#__codelineno-6-10">10</a></span>
|
|
<span class="normal"><a href="#__codelineno-6-11">11</a></span>
|
|
<span class="normal"><a href="#__codelineno-6-12">12</a></span>
|
|
<span class="normal"><a href="#__codelineno-6-13">13</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-6-1" name="__codelineno-6-1"></a><span class="k">public</span><span class="w"> </span><span class="k">interface</span><span class="w"> </span><span class="n">ICollection</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="n">IEnumerable</span><span class="o"><</span><span class="n">T</span><span class="o">></span>
|
|
<a id="__codelineno-6-2" name="__codelineno-6-2"></a><span class="p">{</span>
|
|
<a id="__codelineno-6-3" name="__codelineno-6-3"></a><span class="w"> </span><span class="c1">// properties</span>
|
|
<a id="__codelineno-6-4" name="__codelineno-6-4"></a><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">Count</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">get</span><span class="p">;</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="c1">// Get the number of elements contained in the ICollection<T></span>
|
|
<a id="__codelineno-6-5" name="__codelineno-6-5"></a><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">IsReadOnly</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">get</span><span class="p">;</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="c1">// Get a value indicating whether the ICollection<T> is read-only</span>
|
|
<a id="__codelineno-6-6" name="__codelineno-6-6"></a>
|
|
<a id="__codelineno-6-7" name="__codelineno-6-7"></a><span class="w"> </span><span class="c1">// methods</span>
|
|
<a id="__codelineno-6-8" name="__codelineno-6-8"></a><span class="w"> </span><span class="k">void</span><span class="w"> </span><span class="nf">Add</span><span class="w"> </span><span class="p">(</span><span class="n">T</span><span class="w"> </span><span class="n">item</span><span class="p">);</span><span class="w"> </span><span class="c1">// Add an item to the ICollection<T></span>
|
|
<a id="__codelineno-6-9" name="__codelineno-6-9"></a><span class="w"> </span><span class="k">void</span><span class="w"> </span><span class="nf">Clear</span><span class="w"> </span><span class="p">();</span><span class="w"> </span><span class="c1">// Removes all items from the ICollection<T></span>
|
|
<a id="__codelineno-6-10" name="__codelineno-6-10"></a><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="nf">Contains</span><span class="w"> </span><span class="p">(</span><span class="n">T</span><span class="w"> </span><span class="n">item</span><span class="p">);</span><span class="w"> </span><span class="c1">// Determines whether the ICollection<T> contains a specific value</span>
|
|
<a id="__codelineno-6-11" name="__codelineno-6-11"></a><span class="w"> </span><span class="n">IEnumerator</span><span class="w"> </span><span class="nf">GetEnumerator</span><span class="w"> </span><span class="p">();</span><span class="w"> </span><span class="c1">// Returns an enumerator that iterates through a collection</span>
|
|
<a id="__codelineno-6-12" name="__codelineno-6-12"></a><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="nf">Remove</span><span class="w"> </span><span class="p">(</span><span class="n">T</span><span class="w"> </span><span class="n">item</span><span class="p">);</span><span class="w"> </span><span class="c1">// Removes the first occurrence of a specific object from the ICollection<T></span>
|
|
<a id="__codelineno-6-13" name="__codelineno-6-13"></a><span class="p">}</span>
|
|
</code></pre></div></td></tr></table></div>
|
|
<h3 id="ilistt"><a href="https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.ilist-1"><code>IList<T></code></a></h3>
|
|
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">C#</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-7-1"> 1</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-2"> 2</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-3"> 3</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-4"> 4</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-5"> 5</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-6"> 6</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-7"> 7</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-8"> 8</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-9"> 9</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-10">10</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-11">11</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-12">12</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-13">13</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-14">14</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-15">15</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-16">16</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-17">17</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-18">18</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-7-1" name="__codelineno-7-1"></a><span class="k">public</span><span class="w"> </span><span class="k">interface</span><span class="w"> </span><span class="n">IList</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="n">ICollection</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">,</span><span class="w"> </span><span class="n">IEnumerable</span><span class="o"><</span><span class="n">T</span><span class="o">></span>
|
|
<a id="__codelineno-7-2" name="__codelineno-7-2"></a><span class="p">{</span>
|
|
<a id="__codelineno-7-3" name="__codelineno-7-3"></a><span class="w"> </span><span class="c1">// properties</span>
|
|
<a id="__codelineno-7-4" name="__codelineno-7-4"></a><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">Count</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">get</span><span class="p">;</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="c1">// Get the number of elements contained in the ICollection<T></span>
|
|
<a id="__codelineno-7-5" name="__codelineno-7-5"></a><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">IsReadOnly</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">get</span><span class="p">;</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="c1">// Get a value indicating whether the ICollection<T> is read-only</span>
|
|
<a id="__codelineno-7-6" name="__codelineno-7-6"></a><span class="w"> </span><span class="n">T</span><span class="w"> </span><span class="k">this</span><span class="p">[</span><span class="kt">int</span><span class="w"> </span><span class="n">index</span><span class="p">]</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">get</span><span class="p">;</span><span class="w"> </span><span class="k">set</span><span class="p">;</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="c1">// Get or set the element at the specified index</span>
|
|
<a id="__codelineno-7-7" name="__codelineno-7-7"></a>
|
|
<a id="__codelineno-7-8" name="__codelineno-7-8"></a><span class="w"> </span><span class="c1">// methods</span>
|
|
<a id="__codelineno-7-9" name="__codelineno-7-9"></a><span class="w"> </span><span class="k">void</span><span class="w"> </span><span class="nf">Add</span><span class="w"> </span><span class="p">(</span><span class="n">T</span><span class="w"> </span><span class="n">item</span><span class="p">);</span><span class="w"> </span><span class="c1">// Add an item to the ICollection<T></span>
|
|
<a id="__codelineno-7-10" name="__codelineno-7-10"></a><span class="w"> </span><span class="k">void</span><span class="w"> </span><span class="nf">Clear</span><span class="w"> </span><span class="p">();</span><span class="w"> </span><span class="c1">// Remove all items from the ICollection<T></span>
|
|
<a id="__codelineno-7-11" name="__codelineno-7-11"></a><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="nf">Contains</span><span class="w"> </span><span class="p">(</span><span class="n">T</span><span class="w"> </span><span class="n">item</span><span class="p">);</span><span class="w"> </span><span class="c1">// Determine whether the ICollection<T> contains a specific value</span>
|
|
<a id="__codelineno-7-12" name="__codelineno-7-12"></a><span class="w"> </span><span class="k">void</span><span class="w"> </span><span class="nf">CopyTo</span><span class="w"> </span><span class="p">(</span><span class="n">T</span><span class="p">[]</span><span class="w"> </span><span class="n">array</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">arrayIndex</span><span class="p">);</span><span class="w"> </span><span class="c1">// Copy the elements of the ICollection<T> to an Array, starting at a particular Array index</span>
|
|
<a id="__codelineno-7-13" name="__codelineno-7-13"></a><span class="w"> </span><span class="n">IEnumerator</span><span class="w"> </span><span class="nf">GetEnumerator</span><span class="w"> </span><span class="p">();</span><span class="w"> </span><span class="c1">// Return an enumerator that iterates through a collection</span>
|
|
<a id="__codelineno-7-14" name="__codelineno-7-14"></a><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="nf">IndexOf</span><span class="w"> </span><span class="p">(</span><span class="n">T</span><span class="w"> </span><span class="n">item</span><span class="p">);</span><span class="w"> </span><span class="c1">// Determine the index of a specific item in the IList<T></span>
|
|
<a id="__codelineno-7-15" name="__codelineno-7-15"></a><span class="w"> </span><span class="k">void</span><span class="w"> </span><span class="nf">Insert</span><span class="w"> </span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">index</span><span class="p">,</span><span class="w"> </span><span class="n">T</span><span class="w"> </span><span class="n">item</span><span class="p">);</span><span class="w"> </span><span class="c1">// Insert an item to the IList<T> at the specified index</span>
|
|
<a id="__codelineno-7-16" name="__codelineno-7-16"></a><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="nf">Remove</span><span class="w"> </span><span class="p">(</span><span class="n">T</span><span class="w"> </span><span class="n">item</span><span class="p">);</span><span class="w"> </span><span class="c1">// Remove the first occurrence of a specific object from the ICollection<T></span>
|
|
<a id="__codelineno-7-17" name="__codelineno-7-17"></a><span class="w"> </span><span class="n">oid</span><span class="w"> </span><span class="nf">RemoveAt</span><span class="w"> </span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">index</span><span class="p">);</span><span class="w"> </span><span class="c1">// Remove the IList<T> item at the specified index</span>
|
|
<a id="__codelineno-7-18" name="__codelineno-7-18"></a><span class="p">}</span>
|
|
</code></pre></div></td></tr></table></div>
|
|
<h2 id="dictionaries"><a href="https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.dictionary-2">Dictionaries</a></h2>
|
|
<p><a href="https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.dictionary-2.valuecollection">ValueCollection</a>
|
|
<a href="https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.dictionary-2.keycollection">KeyCollection</a></p>
|
|
<p><strong>Notes</strong>:</p>
|
|
<ul>
|
|
<li>Enumerating a dictionary will return <code>KeyValuePair<TKey, TValue></code>.</li>
|
|
<li>The <code>Dictionary<TKey, TValue></code> collection class relies on hashes to offer fast lookup (<code>TKey</code> should have a good <code>GetHashCode()</code>).</li>
|
|
</ul>
|
|
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">C#</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-8-1"> 1</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-2"> 2</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-3"> 3</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-4"> 4</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-5"> 5</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-6"> 6</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-7"> 7</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-8"> 8</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-9"> 9</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-10">10</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-11">11</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-12">12</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-13">13</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-14">14</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-15">15</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-16">16</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-17">17</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-18">18</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-19">19</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-20">20</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-21">21</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-22">22</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-23">23</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-24">24</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-25">25</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-26">26</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-27">27</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-28">28</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-29">29</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-30">30</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-31">31</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-32">32</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-33">33</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-34">34</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-35">35</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-8-1" name="__codelineno-8-1"></a><span class="n">Dictionary</span><span class="o"><</span><span class="n">TKey</span><span class="p">,</span><span class="w"> </span><span class="n">TValue</span><span class="o">></span><span class="w"> </span><span class="n">dict</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">Dictionary</span><span class="o"><</span><span class="n">TKey</span><span class="p">,</span><span class="w"> </span><span class="n">TValue</span><span class="o">></span><span class="p">();</span><span class="w"> </span><span class="c1">// init empty dict</span>
|
|
<a id="__codelineno-8-2" name="__codelineno-8-2"></a><span class="n">Dictionary</span><span class="o"><</span><span class="n">TKey</span><span class="p">,</span><span class="w"> </span><span class="n">TValue</span><span class="o">></span><span class="w"> </span><span class="n">dict</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">Dictionary</span><span class="o"><</span><span class="n">TKey</span><span class="p">,</span><span class="w"> </span><span class="n">TValue</span><span class="o">></span><span class="p">(</span><span class="n">IEqualityComparer</span><span class="o"><</span><span class="n">TKey</span><span class="o">></span><span class="p">);</span><span class="w"> </span><span class="c1">// specify key comparer (TKey must implement Equals() and GetHashCode())</span>
|
|
<a id="__codelineno-8-3" name="__codelineno-8-3"></a>
|
|
<a id="__codelineno-8-4" name="__codelineno-8-4"></a><span class="c1">// initializer (implicitly uses Add method)</span>
|
|
<a id="__codelineno-8-5" name="__codelineno-8-5"></a><span class="n">Dictionary</span><span class="o"><</span><span class="n">TKey</span><span class="p">,</span><span class="w"> </span><span class="n">TValue</span><span class="o">></span><span class="w"> </span><span class="n">dict</span><span class="w"> </span><span class="o">=</span>
|
|
<a id="__codelineno-8-6" name="__codelineno-8-6"></a><span class="p">{</span>
|
|
<a id="__codelineno-8-7" name="__codelineno-8-7"></a><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="n">key</span><span class="p">,</span><span class="w"> </span><span class="k">value</span><span class="w"> </span><span class="p">}</span>
|
|
<a id="__codelineno-8-8" name="__codelineno-8-8"></a><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="n">key</span><span class="p">,</span><span class="w"> </span><span class="k">value</span><span class="w"> </span><span class="p">},</span>
|
|
<a id="__codelineno-8-9" name="__codelineno-8-9"></a><span class="w"> </span><span class="p">...</span>
|
|
<a id="__codelineno-8-10" name="__codelineno-8-10"></a><span class="p">}</span>
|
|
<a id="__codelineno-8-11" name="__codelineno-8-11"></a>
|
|
<a id="__codelineno-8-12" name="__codelineno-8-12"></a><span class="c1">// object initializer</span>
|
|
<a id="__codelineno-8-13" name="__codelineno-8-13"></a><span class="n">Dictionary</span><span class="o"><</span><span class="n">TKey</span><span class="p">,</span><span class="w"> </span><span class="n">TValue</span><span class="o">></span><span class="w"> </span><span class="n">dict</span><span class="w"> </span><span class="o">=</span>
|
|
<a id="__codelineno-8-14" name="__codelineno-8-14"></a><span class="p">{</span>
|
|
<a id="__codelineno-8-15" name="__codelineno-8-15"></a><span class="w"> </span><span class="na">[key]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">value</span><span class="p">,</span>
|
|
<a id="__codelineno-8-16" name="__codelineno-8-16"></a><span class="w"> </span><span class="na">[key]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">value</span><span class="p">,</span>
|
|
<a id="__codelineno-8-17" name="__codelineno-8-17"></a><span class="w"> </span><span class="p">...</span>
|
|
<a id="__codelineno-8-18" name="__codelineno-8-18"></a><span class="p">}</span>
|
|
<a id="__codelineno-8-19" name="__codelineno-8-19"></a>
|
|
<a id="__codelineno-8-20" name="__codelineno-8-20"></a><span class="c1">// indexer access</span>
|
|
<a id="__codelineno-8-21" name="__codelineno-8-21"></a><span class="n">dict</span><span class="p">[</span><span class="n">key</span><span class="p">];</span><span class="w"> </span><span class="c1">// read value associated with key (throws KeyNotFoundException if key does not exist)</span>
|
|
<a id="__codelineno-8-22" name="__codelineno-8-22"></a><span class="n">dict</span><span class="p">[</span><span class="n">key</span><span class="p">]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">value</span><span class="p">;</span><span class="w"> </span><span class="c1">// modify value associated with key (throws KeyNotFoundException if key does not exist)</span>
|
|
<a id="__codelineno-8-23" name="__codelineno-8-23"></a>
|
|
<a id="__codelineno-8-24" name="__codelineno-8-24"></a><span class="n">dict</span><span class="p">.</span><span class="n">Count</span><span class="p">;</span><span class="w"> </span><span class="c1">// number of key-value pair stored in the dict</span>
|
|
<a id="__codelineno-8-25" name="__codelineno-8-25"></a><span class="n">dict</span><span class="p">.</span><span class="n">Keys</span><span class="p">;</span><span class="w"> </span><span class="c1">// Dictionary<TKey,TValue>.KeyCollection containing the keys of the dict</span>
|
|
<a id="__codelineno-8-26" name="__codelineno-8-26"></a><span class="n">dict</span><span class="p">.</span><span class="n">Values</span><span class="p">;</span><span class="w"> </span><span class="c1">// Dictionary<TKey,TValue>.ValueCollection containing the values of the dict</span>
|
|
<a id="__codelineno-8-27" name="__codelineno-8-27"></a>
|
|
<a id="__codelineno-8-28" name="__codelineno-8-28"></a><span class="n">dict</span><span class="p">.</span><span class="n">Add</span><span class="p">(</span><span class="n">key</span><span class="p">,</span><span class="w"> </span><span class="k">value</span><span class="p">);</span><span class="w"> </span><span class="c1">// ArgumentException if the key already exists</span>
|
|
<a id="__codelineno-8-29" name="__codelineno-8-29"></a><span class="n">dict</span><span class="p">.</span><span class="n">Clear</span><span class="p">();</span><span class="w"> </span><span class="c1">// empty the dictionary</span>
|
|
<a id="__codelineno-8-30" name="__codelineno-8-30"></a><span class="n">dict</span><span class="p">.</span><span class="n">ContainsKey</span><span class="p">(</span><span class="n">key</span><span class="p">);</span><span class="w"> </span><span class="c1">// check if a key is in the dictionary</span>
|
|
<a id="__codelineno-8-31" name="__codelineno-8-31"></a><span class="n">dict</span><span class="p">.</span><span class="n">ContainsValue</span><span class="p">(</span><span class="k">value</span><span class="p">);</span><span class="w"> </span><span class="c1">// check if a value is in the dictionary</span>
|
|
<a id="__codelineno-8-32" name="__codelineno-8-32"></a><span class="n">dict</span><span class="p">.</span><span class="n">Remove</span><span class="p">(</span><span class="n">key</span><span class="p">);</span><span class="w"> </span><span class="c1">// remove a key-value pair</span>
|
|
<a id="__codelineno-8-33" name="__codelineno-8-33"></a><span class="n">dict</span><span class="p">.</span><span class="n">Remove</span><span class="p">(</span><span class="n">key</span><span class="p">,</span><span class="w"> </span><span class="k">out</span><span class="w"> </span><span class="kt">var</span><span class="p">);</span><span class="w"> </span><span class="c1">// remove key-value pair and copy TValue to var parameter</span>
|
|
<a id="__codelineno-8-34" name="__codelineno-8-34"></a><span class="n">dict</span><span class="p">.</span><span class="n">TryAdd</span><span class="p">(</span><span class="n">key</span><span class="p">,</span><span class="w"> </span><span class="k">value</span><span class="p">);</span><span class="w"> </span><span class="c1">// adds a key-value pair; returns true if pair is added, false otherwise</span>
|
|
<a id="__codelineno-8-35" name="__codelineno-8-35"></a><span class="n">dict</span><span class="p">.</span><span class="n">TryGetValue</span><span class="p">(</span><span class="n">key</span><span class="p">,</span><span class="w"> </span><span class="k">out</span><span class="w"> </span><span class="kt">var</span><span class="p">);</span><span class="w"> </span><span class="c1">// put the value associated with kay in the var parameter; true if the dict contains an element with the specified key, false otherwise.</span>
|
|
</code></pre></div></td></tr></table></div>
|
|
<h2 id="sets"><a href="https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.hashset-1">Sets</a></h2>
|
|
<p>Collection of non duplicate items.</p>
|
|
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">C#</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-9-1"> 1</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-2"> 2</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-3"> 3</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-4"> 4</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-5"> 5</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-6"> 6</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-7"> 7</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-8"> 8</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-9"> 9</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-10">10</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-11">11</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-12">12</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-13">13</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-14">14</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-15">15</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-16">16</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-17">17</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-18">18</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-19">19</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-20">20</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-21">21</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-22">22</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-9-1" name="__codelineno-9-1"></a><span class="n">HashSet</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="k">set</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">HashSet</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">();</span>
|
|
<a id="__codelineno-9-2" name="__codelineno-9-2"></a>
|
|
<a id="__codelineno-9-3" name="__codelineno-9-3"></a><span class="k">set</span><span class="p">.</span><span class="n">Add</span><span class="p">(</span><span class="n">T</span><span class="p">);</span><span class="w"> </span><span class="c1">// adds an item to the set; true if the element is added, false if the element is already present.</span>
|
|
<a id="__codelineno-9-4" name="__codelineno-9-4"></a><span class="k">set</span><span class="p">.</span><span class="n">Clear</span><span class="p">();</span><span class="w"> </span><span class="c1">//Remove all elements from a HashSet<T> object.</span>
|
|
<a id="__codelineno-9-5" name="__codelineno-9-5"></a><span class="k">set</span><span class="p">.</span><span class="n">Contains</span><span class="p">(</span><span class="n">T</span><span class="p">);</span><span class="w"> </span><span class="c1">// Determine whether a HashSet<T> object contains the specified element.</span>
|
|
<a id="__codelineno-9-6" name="__codelineno-9-6"></a><span class="k">set</span><span class="p">.</span><span class="n">CopyTo</span><span class="p">(</span><span class="n">T</span><span class="p">[]);</span><span class="w"> </span><span class="c1">// Coy the elements of a HashSet<T> object to an array.</span>
|
|
<a id="__codelineno-9-7" name="__codelineno-9-7"></a><span class="k">set</span><span class="p">.</span><span class="n">CopyTo</span><span class="p">(</span><span class="n">T</span><span class="p">[],</span><span class="w"> </span><span class="n">arrayIndex</span><span class="p">);</span><span class="w"> </span><span class="c1">// Copy the elements of a HashSet<T> object to an array, starting at the specified array index.</span>
|
|
<a id="__codelineno-9-8" name="__codelineno-9-8"></a><span class="k">set</span><span class="p">.</span><span class="n">CopyTo</span><span class="p">(</span><span class="n">T</span><span class="p">[],</span><span class="w"> </span><span class="n">arrayIndex</span><span class="p">,</span><span class="w"> </span><span class="n">count</span><span class="p">);</span><span class="w"> </span><span class="c1">// Copies the specified number of elements of a HashSet<T> object to an array, starting at the specified array index.</span>
|
|
<a id="__codelineno-9-9" name="__codelineno-9-9"></a><span class="k">set</span><span class="p">.</span><span class="n">CreateSetComparer</span><span class="p">();</span><span class="w"> </span><span class="c1">// Return an IEqualityComparer object that can be used for equality testing of a HashSet<T> object.</span>
|
|
<a id="__codelineno-9-10" name="__codelineno-9-10"></a><span class="k">set</span><span class="p">.</span><span class="n">ExceptWith</span><span class="p">(</span><span class="n">IEnumerable</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">);</span><span class="w"> </span><span class="c1">// Remove all elements in the specified collection from the current HashSet<T> object.</span>
|
|
<a id="__codelineno-9-11" name="__codelineno-9-11"></a><span class="k">set</span><span class="p">.</span><span class="n">IntersectWith</span><span class="p">(</span><span class="n">IEnumerable</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">);</span><span class="w"> </span><span class="c1">// Modify the current HashSet<T> object to contain only elements that are present in that object and in the specified collection.</span>
|
|
<a id="__codelineno-9-12" name="__codelineno-9-12"></a><span class="k">set</span><span class="p">.</span><span class="n">IsProperSubsetOf</span><span class="p">(</span><span class="n">IEnumerable</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">);</span><span class="w"> </span><span class="c1">// Determine whether a HashSet<T> object is a proper subset of the specified collection.</span>
|
|
<a id="__codelineno-9-13" name="__codelineno-9-13"></a><span class="k">set</span><span class="p">.</span><span class="n">IsProperSupersetOf</span><span class="p">(</span><span class="n">IEnumerable</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">);</span><span class="w"> </span><span class="c1">// Determine whether a HashSet<T> object is a proper superset of the specified collection.</span>
|
|
<a id="__codelineno-9-14" name="__codelineno-9-14"></a><span class="k">set</span><span class="p">.</span><span class="n">IsSubsetOf</span><span class="p">(</span><span class="n">IEnumerable</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">);</span><span class="w"> </span><span class="c1">// Determine whether a HashSet<T> object is a subset of the specified collection.</span>
|
|
<a id="__codelineno-9-15" name="__codelineno-9-15"></a><span class="k">set</span><span class="p">.</span><span class="n">IsSupersetOf</span><span class="p">(</span><span class="n">IEnumerable</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">);</span><span class="w"> </span><span class="c1">// Determine whether a HashSet<T> object is a superset of the specified collection.</span>
|
|
<a id="__codelineno-9-16" name="__codelineno-9-16"></a><span class="k">set</span><span class="p">.</span><span class="n">Overlaps</span><span class="p">(</span><span class="n">IEnumerable</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">);</span><span class="w"> </span><span class="c1">// Determine whether the current HashSet<T> object and a specified collection share common elements.</span>
|
|
<a id="__codelineno-9-17" name="__codelineno-9-17"></a><span class="k">set</span><span class="p">.</span><span class="n">Remove</span><span class="p">(</span><span class="n">T</span><span class="p">);</span><span class="w"> </span><span class="c1">// Remove the specified element from a HashSet<T> object.</span>
|
|
<a id="__codelineno-9-18" name="__codelineno-9-18"></a><span class="k">set</span><span class="p">.</span><span class="n">RemoveWhere</span><span class="p">(</span><span class="n">Predicate</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">);</span><span class="w"> </span><span class="c1">// Remove all elements that match the conditions defined by the specified predicate from a HashSet<T> collection.</span>
|
|
<a id="__codelineno-9-19" name="__codelineno-9-19"></a><span class="k">set</span><span class="p">.</span><span class="n">SetEquals</span><span class="p">(</span><span class="n">IEnumerable</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">);</span><span class="w"> </span><span class="c1">// Determine whether a HashSet<T> object and the specified collection contain the same elements.</span>
|
|
<a id="__codelineno-9-20" name="__codelineno-9-20"></a><span class="k">set</span><span class="p">.</span><span class="n">SymmetricExceptWith</span><span class="p">(</span><span class="n">IEnumerable</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">);</span><span class="w"> </span><span class="c1">// Modify the current HashSet<T> object to contain only elements that are present either in that object or in the specified collection, but not both.</span>
|
|
<a id="__codelineno-9-21" name="__codelineno-9-21"></a><span class="k">set</span><span class="p">.</span><span class="n">UnionWith</span><span class="p">(</span><span class="n">IEnumerable</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">);</span><span class="w"> </span><span class="c1">// Modify the current HashSet<T> object to contain all elements that are present in itself, the specified collection, or both.</span>
|
|
<a id="__codelineno-9-22" name="__codelineno-9-22"></a><span class="k">set</span><span class="p">.</span><span class="n">TryGetValue</span><span class="p">(</span><span class="n">T</span><span class="p">,</span><span class="w"> </span><span class="k">out</span><span class="w"> </span><span class="n">T</span><span class="p">);</span><span class="w"> </span><span class="c1">// Search the set for a given value and returns the equal value it finds, if any.</span>
|
|
</code></pre></div></td></tr></table></div>
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