xamarin-macios/tests/bindings-framework-test/StructsAndEnums.cs

using System;
using System.Runtime.InteropServices;

namespace Bindings.Test
{
	public static class CFunctions {
		[DllImport ("__Internal")]
		public static extern int theUltimateAnswer ();

#if !__MACOS__ && !XCFRAMEWORK
		[DllImport ("__Internal")]
		public static extern int object_theUltimateAnswer ();

		[DllImport ("__Internal")]
		public static extern int ar_theUltimateAnswer ();
#endif
	}

	// Verify that System.Drawing.Color usage compiles
	public class Foo {
		public void Bar (System.Drawing.Color color) { }
	}
}