Remove "netcoreapp2.0" target from the Avalonia. Make previewer use netstandard2.0 (#14268)

* Remove "netcoreapp2.0" target from the Avalonia. Make previewer use netstandard2.0

* Update ApiDiff redirects

Directory.Build.props

@@ -2,7 +2,7 @@
   <Import Project="$(MSBuildThisFileDirectory)/build/AvaloniaPublicKey.props"/>
   <PropertyGroup>
       <PackageOutputPath Condition="'$(PackageOutputPath)' == ''">$(MSBuildThisFileDirectory)build-intermediate/nuget</PackageOutputPath>
-      <AvaloniaPreviewerNetCoreToolPath>$(MSBuildThisFileDirectory)\src\tools\Avalonia.Designer.HostApp\bin\$(Configuration)\netcoreapp2.0\Avalonia.Designer.HostApp.dll</AvaloniaPreviewerNetCoreToolPath>
+      <AvaloniaPreviewerNetCoreToolPath>$(MSBuildThisFileDirectory)\src\tools\Avalonia.Designer.HostApp\bin\$(Configuration)\netstandard2.0\Avalonia.Designer.HostApp.dll</AvaloniaPreviewerNetCoreToolPath>
       <!-- https://github.com/dotnet/msbuild/issues/2661 -->
       <AddSyntheticProjectReferencesForSolutionDependencies>false</AddSyntheticProjectReferencesForSolutionDependencies>
       <MSBuildEnableWorkloadResolver>false</MSBuildEnableWorkloadResolver>

nukebuild/ApiDiffHelper.cs

@@ -105,7 +105,9 @@ public static class ApiDiffHelper
     {
         // We use StartsWith below comparing these tfm, as we ignore platform versions (like, net6.0-ios16.1)
         ("net6.0-android", "net7.0-android"),
-        ("net6.0-ios", "net7.0-ios")
+        ("net6.0-ios", "net7.0-ios"),
+        // Designer was moved from netcoreapp to netstandard 
+        ("netcoreapp2.0", "netstandard2.0")
     };
 
     public static async Task ValidatePackage(

packages/Avalonia/Avalonia.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-      <TargetFrameworks>net6.0;netstandard2.0;net461;netcoreapp2.0</TargetFrameworks>
+      <TargetFrameworks>net6.0;netstandard2.0;net461</TargetFrameworks>
       <PackageId>Avalonia</PackageId>
   </PropertyGroup>
 
@@ -27,11 +27,11 @@
   </PropertyGroup>
 
   <Target Name="AddDesignerHostAppsToPackage" BeforeTargets="GenerateNuspec">
-    <MSBuild Projects="$(DesignerHostAppPath)/Avalonia.Designer.HostApp/Avalonia.Designer.HostApp.csproj" Properties="Configuration=$(Configuration);&#xA;                         Platform=$(Platform)" />
+    <MSBuild Projects="$(DesignerHostAppPath)/Avalonia.Designer.HostApp/Avalonia.Designer.HostApp.csproj" Properties="Configuration=$(Configuration);&#xA;Platform=$(Platform)" />
 
     <ItemGroup>
-      <_PackageFiles Include="$(DesignerHostAppPath)/Avalonia.Designer.HostApp/bin/$(Configuration)/netcoreapp2.0/Avalonia.Designer.HostApp.dll">
-        <PackagePath>tools/netcoreapp2.0/designer</PackagePath>
+      <_PackageFiles Include="$(DesignerHostAppPath)/Avalonia.Designer.HostApp/bin/$(Configuration)/netstandard2.0/Avalonia.Designer.HostApp.dll">
+        <PackagePath>tools/netstandard2.0/designer</PackagePath>
         <Visible>false</Visible>
         <BuildAction>None</BuildAction>
       </_PackageFiles>

packages/Avalonia/Avalonia.props

@@ -1,6 +1,6 @@
 <Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
-    <AvaloniaPreviewerNetCoreToolPath>$(MSBuildThisFileDirectory)\..\tools\netcoreapp2.0\designer\Avalonia.Designer.HostApp.dll</AvaloniaPreviewerNetCoreToolPath>
+    <AvaloniaPreviewerNetCoreToolPath>$(MSBuildThisFileDirectory)\..\tools\netstandard2.0\designer\Avalonia.Designer.HostApp.dll</AvaloniaPreviewerNetCoreToolPath>
     <AvaloniaPreviewerNetFullToolPath>$(MSBuildThisFileDirectory)\..\tools\net461\designer\Avalonia.Designer.HostApp.exe</AvaloniaPreviewerNetFullToolPath>
     <AvaloniaBuildTasksLocation>$(MSBuildThisFileDirectory)\..\tools\netstandard2.0\Avalonia.Build.Tasks.dll</AvaloniaBuildTasksLocation>
     <AvaloniaUseExternalMSBuild>false</AvaloniaUseExternalMSBuild>

samples/Directory.Build.props

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <IsPackable>false</IsPackable>
-    <AvaloniaPreviewerNetCoreToolPath>$(MSBuildThisFileDirectory)..\src\tools\Avalonia.Designer.HostApp\bin\Debug\netcoreapp2.0\Avalonia.Designer.HostApp.dll</AvaloniaPreviewerNetCoreToolPath>
+    <AvaloniaPreviewerNetCoreToolPath>$(MSBuildThisFileDirectory)..\src\tools\Avalonia.Designer.HostApp\bin\Debug\netstandard2.0\Avalonia.Designer.HostApp.dll</AvaloniaPreviewerNetCoreToolPath>
     <EnableNETAnalyzers>false</EnableNETAnalyzers>
     <LangVersion>11</LangVersion>
     <NoWarn>$(NoWarn);CS8002</NoWarn> <!-- ignore signing warnings for samples -->

src/Markup/Avalonia.Markup.Xaml.Loader/Avalonia.Markup.Xaml.Loader.csproj

@@ -5,22 +5,11 @@
     <IsPackable>true</IsPackable>
     <DefineConstants>$(DefineConstants);XAMLX_INTERNAL;XAML_RUNTIME_LOADER</DefineConstants>
   </PropertyGroup>
-  <!--Disable Net Perf. analyzer for submodule to avoid commit issue -->
-  <PropertyGroup>
-    <EnableNETAnalyzers>false</EnableNETAnalyzers>
-  </PropertyGroup>
-  <Import Project="IncludeXamlIlSre.props" />
-  <ItemGroup>
-    <Compile Include="..\..\Avalonia.Base\Utilities\StringBuilderCache.cs" Link="Utilities\StringBuilderCache.cs" />
-    <Compile Include="..\..\Avalonia.Base\Compatibility\TrimmingAttributes.cs" Link="TrimmingAttributes.cs" Visible="False" />
-    <Compile Include="..\..\Shared\IsExternalInit.cs" Link="Compatibility\IsExternalInit.cs" />
-  </ItemGroup>
-  <ItemGroup>
-    <PackageReference Include="System.Reflection.Emit" Version="4.3.0" />
-  </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Avalonia.Markup.Xaml\Avalonia.Markup.Xaml.csproj" />
   </ItemGroup>
+
+  <Import Project="IncludeXamlIlSre.props" />
   <Import Project="..\..\..\build\DevAnalyzers.props" />
   <Import Project="..\..\..\build\TrimmingEnable.props" />
   <Import Project="..\..\..\build\SourceGenerators.props" />

src/Markup/Avalonia.Markup.Xaml.Loader/IncludeXamlIlSre.props

@@ -1,9 +1,26 @@
 <Project>
+  <!--Disable Net Perf. analyzer for submodule to avoid commit issue -->
+  <PropertyGroup>
+    <EnableNETAnalyzers>false</EnableNETAnalyzers>
+  </PropertyGroup>
+
   <ItemGroup>
     <None Remove="$(MSBuildThisFileDirectory)\xamlil.github\**\*.*" />
     <Content Remove="$(MSBuildThisFileDirectory)\xamlil.github\**\*.*" />
     <Compile Remove="$(MSBuildThisFileDirectory)\xamlil.github\**\*.*" />
     <Compile Include="$(MSBuildThisFileDirectory)\xamlil.github\src\XamlX\**\*.cs" />
     <Compile Remove="$(MSBuildThisFileDirectory)\xamlil.github\**\obj\**\*.cs" />
+
+    <!-- Polyfills used by XamlX, but re-imported from this repository -->
+    <Compile Include="$(MSBuildThisFileDirectory)\..\..\Avalonia.Base\Metadata\NullableAttributes.cs" Link="NullableAttributes.cs" Visible="False" />
+    <Compile Include="$(MSBuildThisFileDirectory)\..\..\Avalonia.Base\Compatibility\TrimmingAttributes.cs" Link="TrimmingAttributes.cs" Visible="False" />
+    <Compile Include="$(MSBuildThisFileDirectory)\..\..\Shared\IsExternalInit.cs" Link="Compatibility\IsExternalInit.cs" />
+
+    <!-- Utilities used by XamlX Avalonia SRE -->
+    <Compile Include="$(MSBuildThisFileDirectory)\..\..\Avalonia.Base\Utilities\StringBuilderCache.cs" Link="Utilities\StringBuilderCache.cs" />
+  </ItemGroup>
+
+  <ItemGroup Condition="!('$(TargetFrameworkIdentifier)' == '.NETCoreApp' AND $([MSBuild]::VersionGreaterThanOrEquals($(TargetFrameworkVersion), '6.0')))">
+    <PackageReference Include="System.Reflection.Emit" Version="4.3.0" />
   </ItemGroup>
 </Project>

src/tools/Avalonia.Designer.HostApp/Avalonia.Designer.HostApp.csproj

@@ -1,31 +1,20 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFrameworks>net461;netcoreapp2.0</TargetFrameworks>
+    <TargetFrameworks>net461;netstandard2.0;net6.0</TargetFrameworks>
     <DefineConstants>$(DefineConstants);XAMLX_INTERNAL</DefineConstants>
   </PropertyGroup>
-  <!--Disable Net Perf. analyzer for submodule to avoid commit issue -->
-  <PropertyGroup>
-    <EnableNETAnalyzers>false</EnableNETAnalyzers>
-  </PropertyGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\Avalonia.DesignerSupport\Avalonia.DesignerSupport.csproj" />
     <ProjectReference Include="..\..\Avalonia.Base\Avalonia.Base.csproj" />
     <ProjectReference Include="..\..\Avalonia.Controls\Avalonia.Controls.csproj" />
-    <ProjectReference Include="..\..\Avalonia.Diagnostics\Avalonia.Diagnostics.csproj" />
-    <ProjectReference Include="..\..\Avalonia.Themes.Simple\Avalonia.Themes.Simple.csproj" />
   </ItemGroup>
-  <Import Project="..\..\..\src\Markup\Avalonia.Markup.Xaml.Loader\IncludeXamlIlSre.props" />
   <ItemGroup>
     <Compile Include="..\..\..\src\Markup\Avalonia.Markup.Xaml.Loader\CompilerExtensions\**\*.cs" />
     <Compile Include="..\..\..\src\Markup\Avalonia.Markup.Xaml.Loader\AvaloniaXamlIlRuntimeCompiler.cs" />
     <Compile Include="..\..\..\src\Markup\Avalonia.Markup.Xaml.Loader\CompilerDynamicDependencies.cs" />
-    <Compile Include="..\..\Avalonia.Base\Utilities\StringBuilderCache.cs" Link="Utilities\StringBuilderCache.cs" />
-    <Compile Include="..\..\Avalonia.Base\Compatibility\TrimmingAttributes.cs" Link="TrimmingAttributes.cs" Visible="False" />
-    <Compile Include="..\..\Shared\IsExternalInit.cs" Link="Compatibility\IsExternalInit.cs" />
   </ItemGroup>
-  <ItemGroup>
-    <PackageReference Include="Avalonia.Angle.Windows.Natives" Version="2.1.22045.20230930" />
-  </ItemGroup>
-  <Import Project="..\..\..\build\NetFX.props" />
+  <Import Project="..\..\..\src\Markup\Avalonia.Markup.Xaml.Loader\IncludeXamlIlSre.props" />
+  <Import Project="..\..\..\build\DevAnalyzers.props" />
+  <Import Project="..\..\..\build\TrimmingEnable.props" />
 </Project>

src/tools/Avalonia.Designer.HostApp/DesignXamlLoader.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using System.IO;
 using System.Linq;
 using System.Reflection;
@@ -9,6 +10,7 @@ using Avalonia.Markup.Xaml.XamlIl;
 
 namespace Avalonia.Designer.HostApp;
 
+[RequiresUnreferencedCode(XamlX.TrimmingMessages.DynamicXamlReference)]
 class DesignXamlLoader : AvaloniaXamlLoader.IRuntimeXamlLoader
 {
     public object Load(RuntimeXamlLoaderDocument document, RuntimeXamlLoaderConfiguration configuration)

src/tools/Avalonia.Designer.HostApp/Program.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Diagnostics.CodeAnalysis;
 using System.IO;
 using System.Reflection;
 using Avalonia.DesignerSupport;
@@ -6,6 +7,7 @@ using Avalonia.Markup.Xaml;
 
 namespace Avalonia.Designer.HostApp
 {
+    [RequiresUnreferencedCode(XamlX.TrimmingMessages.DynamicXamlReference)]
     class Program
     {
 #if NETFRAMEWORK

tests/Avalonia.DesignerSupport.Tests/DesignerSupportTests.cs

@@ -19,7 +19,7 @@ namespace Avalonia.DesignerSupport.Tests
 {
     public class DesignerSupportTests
     {
-        private const string DesignerAppPath = "../../../../../src/tools/Avalonia.Designer.HostApp/bin/$BUILD/netcoreapp2.0/Avalonia.Designer.HostApp.dll";
+        private const string DesignerAppPath = "../../../../../src/tools/Avalonia.Designer.HostApp/bin/$BUILD/netstandard2.0/Avalonia.Designer.HostApp.dll";
         private readonly Xunit.Abstractions.ITestOutputHelper outputHelper;
 
         public DesignerSupportTests(Xunit.Abstractions.ITestOutputHelper outputHelper)