Roslyn analyzer/code fixer for use of Marshal.* functions

When using C#/WinRT, how developers do COM interop has changed a bit.

Before:

Guid guid = new Guid(ISurfaceImageSourceNative);
var imageSource = new MyImageSource();
IntPtr pointer = Marshal.GetIUnknownForObject(imageSource);
IntPtr pOut;
Marshal.QueryInterface(pointer, ref guid, out pOut);
var nativeInterface = (ISurfaceImageSourceNative)Marshal.GetObjectForIUnknown(pOut);
nativeInterface = null;
Marshal.Release(pOut);

Now:

var imageSource = new MyImageSource();
var nativeInterface = imageSource.As<ISurfaceImageSourceNative>();

The new code is so much prettier! But it will be a stumbling block for developers who are used to the old pattern. I think it should be possible to detect usage of Marshal.* APIs with a Roslyn analyzer, and hopefully a code-fixer as well. This could be added to https://github.com/dotnet/try-convert/issues/308

Thoughts?

Edit: Here's the definition of ISurfaceImageSourceNative

[ComImport, Guid(MainWindow.ISurfaceImageSourceNative), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface ISurfaceImageSourceNative {
}

Start by reviewing the requested Roslyn analyzer and code-fixer scope around the Marshal.* usage pattern shown in the issue, along with the referenced try-convert issue 308. Done should include a defined detection and migration behavior for the old COM interop pattern, but the issue does not name repository files or tests.