[MSBuild] Allow types to be excluded when generating intersection

<PropertyGroup>
  <IntersectionExcludeType>Type1;Type2</IntersectionExcludeType>
</PropertyGroup>

The type names are passed to ApiIntersect using the -b parameter.

Author: mrward

src/Build/NuGet.Build.Packaging.Tasks/ApiIntersect.cs

@@ -17,6 +17,8 @@ public class ApiIntersect : ToolTask
 
 		public ITaskItem[] ReferencePath { get; set; }
 
+		public ITaskItem[] ExcludeType { get; set; }
+
 		[Required]
 		public ITaskItem RootOutputDirectory { get; set; }
 
@@ -64,6 +66,14 @@ protected override string GenerateCommandLineCommands()
 				builder.AppendFileNameIfNotNull(referencePath.ItemSpec);
 			}
 
+			foreach (var excludeType in ExcludeType.NullAsEmpty())
+			{
+				builder.AppendSwitch("-b");
+				builder.AppendTextUnquoted(" \"");
+				builder.AppendTextUnquoted(excludeType.ItemSpec);
+				builder.AppendTextUnquoted("\"");
+			}
+
 			return builder.ToString();
 		}
 

src/Build/NuGet.Build.Packaging.Tasks/NuGet.Build.Packaging.targets

@@ -522,6 +522,7 @@ Copyright (c) .NET Foundation. All rights reserved.
 			RootOutputDirectory="$(IntermediateOutputPath)"
 			IntersectionAssembly="@(IntersectionAssembly)"
 			ReferencePath="$(IntersectionAssemblyReferencePath)"
+			ExcludeType="$(IntersectionExcludeType)"
 			ToolPath="$(ApiIntersectToolPath)"
 			ToolExe="$(ApiIntersectToolExe)">
 			<Output TaskParameter="OutputDirectory" ItemName="_ReferenceAssemblyBuildInfo" />