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feat(dotnet): add "magic methods" notes

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Marcello 2022-10-27 18:17:14 +02:00
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commit 0bca4bd4ab
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27
docs/dotnet/C#/C#.md
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@ -2922,22 +2922,19 @@ In this case, the method must also be declared as `static`.
private static extern void AVIFileInit();
```
The `LibraryImport` attribute can be used to import external code and have the source generator handle the marshalling for the annotated function.
## Magic Methods
> **Note**: The source generator will still use the `DllImport` attribute in the generated code.
Methods needed to implement a behaviour which do not need an interface to work. The methods **must** be named _appropriately_ and have the correct _return type_.
### Enumerable
```cs
// before
public static class Native
{
[DllImport(nameof(Native), CharSet = CharSet.Unicode)]
public extern static string ToLower(string str);
}
// after
public static class Native
{
[LibraryImport(nameof(Native), StringMarshalling = StringMarshalling.Utf16)]
public static partial string ToLower(string str);
}
public bool MoveNext(/* ... */);
public T Current { get; }
```
### Awaitable
```cs
public TaskAwaiter GetAwaiter(/* ... */);
```