Multi-target C# WinRT tests

src/Compilers/CSharp/Test/WinRT/Microsoft.CodeAnalysis.CSharp.WinRT.UnitTests.csproj

@@ -6,8 +6,8 @@
     <PlatformTarget>AnyCPU</PlatformTarget>
     <OutputType>Library</OutputType>
     <RootNamespace>Microsoft.CodeAnalysis.CSharp.UnitTests.CodeGen</RootNamespace>
-    <TargetFramework>net46</TargetFramework>
-    <RuntimeIdentifier>$(RoslynDesktopRuntimeIdentifier)</RuntimeIdentifier>
+    <TargetFrameworks>$(RoslynPortableTargetFrameworks)</TargetFrameworks>
+    <RoslynProjectType>UnitTestPortable</RoslynProjectType>
     <RoslynProjectType>UnitTest</RoslynProjectType>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|AnyCPU'" />
@@ -21,10 +21,7 @@
     <ProjectReference Include="..\..\..\VisualBasic\Portable\Microsoft.CodeAnalysis.VisualBasic.vbproj" />
     <ProjectReference Include="..\..\..\..\Test\PdbUtilities\Roslyn.Test.PdbUtilities.csproj" />
   </ItemGroup>
-  <ItemGroup>
-    <Reference Include="System.Xml.Linq" />
-  </ItemGroup>
   <ItemGroup>
     <Service Include="{82A7F48D-3B50-4B1E-B82E-3ADA8210C358}" />
   </ItemGroup>
-</Project>
\ No newline at end of file
+</Project>

src/Compilers/CSharp/Test/WinRT/PEParameterSymbolTests.cs

@@ -6,13 +6,13 @@
 using Microsoft.CodeAnalysis.CSharp.Test.Utilities;
 using Microsoft.CodeAnalysis.Test.Utilities;
 using Roslyn.Test.Utilities;
-using Roslyn.Test.Utilities.Desktop;
 using Xunit;
 
 namespace Microsoft.CodeAnalysis.CSharp.UnitTests.Symbols
 {
     public class PEParameterSymbolTests : CSharpTestBase
     {
+#if !NETCOREAPP2_1
         [Fact]
         public void NoParameterNames()
         {
@@ -21,7 +21,7 @@ public void NoParameterNames()
             // {
             //   void M(object, object);
             // }
-            var reference = DesktopRuntimeUtil.CreateReflectionEmitAssembly(moduleBuilder =>
+            var reference = Roslyn.Test.Utilities.Desktop.DesktopRuntimeUtil.CreateReflectionEmitAssembly(moduleBuilder =>
                 {
                     var typeBuilder = moduleBuilder.DefineType(
                         "I",
@@ -48,6 +48,7 @@ static void M(I o)
                 // (5,16): error CS1744: Named argument 'value' specifies a parameter for which a positional argument has already been given
                 Diagnostic(ErrorCode.ERR_NamedArgumentUsedInPositional, "value").WithArguments("value").WithLocation(5, 16));
         }
+#endif
 
         [Fact]
         [WorkItem(8018, "https://github.com/dotnet/roslyn/issues/8018")]