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[One .NET] support latest C# 10 language features
Context: dotnet/sdk#19521 Fixes: dotnet#6075 Fixes: dotnet#6076 We need to make two sets of changes for C# 10: 1. Support "global usings". Our .NET 6 templates should have no `using` statements at the top of `.cs` files. 2. Use `$(Nullable)` `enable` by default in project templates. To test this, our .NET 6 MSBuild tests use `Nullable=enable` and `ImplicitUsings=enable` by default and do not include `using` statements in `.cs` files. I've made a new `MainActivity.cs` for our .NET 6 MSBuild tests. The "legacy" Xamarin.Android tests will use the original file. Our default `global using` are: global using global::Android.App; global using global::Android.Widget; global using Bundle = global::Android.OS.Bundle; The last one is intentionally not bringing in `Android.OS`, because `Android.OS.Environment` would conflict with `System.Environment`. So `AutoImport.props` should become: <ItemGroup Condition=" '$(TargetPlatformIdentifier)' == 'android' and ('$(ImplicitUsings)' == 'true' or '$(ImplicitUsings)' == 'enable') "> <Using Include="Android.App" /> <Using Include="Android.Widget" /> <Using Include="Android.OS.Bundle" Alias="Bundle" /> </ItemGroup> So these items are present at the time `.csproj` files are evaluated. Any templates will add: <Nullable>enable</Nullable> <ImplicitUsings>enable</ImplicitUsings> If users want to configure these settings, they can remove `$(ImplicitUsings)` from the `.csproj` completely or remove specific `@(Using)` items: <ItemGroup> <Using Remove="Android.App" /> </ItemGroup>
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Original file line number | Diff line number | Diff line change |
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@@ -1,5 +1,3 @@ | ||
using System; | ||
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namespace AndroidLib1 | ||
{ | ||
public class Class1 | ||
|
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24 changes: 24 additions & 0 deletions
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src/Xamarin.Android.Build.Tasks/Tests/Xamarin.ProjectTools/Resources/DotNet/MainActivity.cs
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Original file line number | Diff line number | Diff line change |
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namespace ${ROOT_NAMESPACE} | ||
{ | ||
[Android.Runtime.Register ("${JAVA_PACKAGENAME}.MainActivity"), Activity (Label = "${PROJECT_NAME}", MainLauncher = true, Icon = "@drawable/icon")] | ||
public class MainActivity : Activity | ||
{ | ||
int count = 1; | ||
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protected override void OnCreate (Bundle? bundle) | ||
{ | ||
base.OnCreate (bundle); | ||
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// Set our view from the "main" layout resource | ||
SetContentView (Resource.Layout.Main); | ||
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var button = FindViewById<Button> (Resource.Id.myButton); | ||
button!.Click += delegate { | ||
button.Text = string.Format ("{0} clicks!", count++); | ||
}; | ||
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//${AFTER_ONCREATE} | ||
} | ||
} | ||
//${AFTER_MAINACTIVITY} | ||
} |
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