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52 lines
2.1 KiB
Markdown
52 lines
2.1 KiB
Markdown
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# App.xaml
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## Root Tag
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The `<Application>` tag begins with two XML namespace declarations, both of which are URIs.
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The default namespace belongs to **Xamarin**. This is the XML namespace (`xmlns`) for elements in the file with no prefix, such as the `ContentPage` tag.
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The URI includes the year that this namespace came into being and the word *forms* as an abbreviation for Xamarin.Forms.
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The second namespace is associated with a prefix of `x` by convention, and it belongs to **Microsoft**. This namespace refers to elements and attributes that are intrinsic to XAML and are found in every XAML implementation.
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The word *winfx* refers to a name once used for the .NET Framework 3.0, which introduced WPF and XAML.
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The `x:Class` attribute can appear only on the root element of a XAML file. It specifies the .NET namespace and name of a derived class. The base class of this derived class is the root element.
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In other words, this `x:Class` specification indicates that the `App` class in the `AppName` namespace derives from `Application`.
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That’s exactly the same information as the `App` class definition in the `App.xaml.cs` file.
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```xml
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<?xml version="1.0" encoding="utf-8" ?>
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<Application xmlns="http://xamarin.com/schemas/2014/forms"
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xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
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x:Class="AppName.App">
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</Application>
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```
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## Shared Resources
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```xml
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<?xml version="1.0" encoding="utf-8" ?>
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<Application xmlns="http://xamarin.com/schemas/2014/forms"
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xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
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x:Class="AppName.App">
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<!-- collection of shared resources definiions -->
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<Application.Resources>
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<!-- Application resource dictionary -->
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<ResourceDictionary>
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<!-- Key-Value Pair -->
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<Type x:Key="DictKey">value<Type>
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</ResourceDictionary>
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<!-- define a reusable style -->
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<Style x:Key="Style Name" TargetType="Element Type">
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<!-- set poperties of the style -->
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<Setter Property="PropertyName" Value="PropertyValue">
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</Style>
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</Application.Resources>
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</Application>
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```
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