The RenderTargetBitmap will cature the _wicSource handler which will release slowly by GC. WPF will throw COM Exception when create RenderTargetBitmap too fast.

Making the RenderTargetBitmap inherit IDisposable. Developers can better control the release of memory.

API Proposal

1. Making the RenderTargetBitmap inherit IDisposable

public class RenderTargetBitmap : IDisposable

2. Add the AsDisposable method

public class RenderTargetBitmap
{
    public IDisposable AsDisposable(){}
}

Add the AsDisposable method can make the Analyzer happy. The Analyzer will not keep alerting that the IDisposable object may be a potential memory leak.

See #3067 (comment)