Silverlight 4 WriteableBitmap to Bitmap

This is my first Silverlight app and my first go at C#. I have a C# class library that I access from Silverlight using COM. The C# library has a method that takes a Bitmap as an argument, however from what I can see Silverlight only has a WritableBitmap. Is there a way to convert a WritableBitmap to 开发者_开发技巧a Bitmap in Silverlight? Some other answers I have read give functions for the conversion, but the functions all return a Bitmap, which obviously throws an error when I try and build. Can anyone help?

Finally got it working by converting the WritableBitmap into a byte array, passing it through and then building the bitmap again on the other side.

I want to make sure I am understanding you correctly, you are using Silverlight to talk to a C# windows library using COM, the c# libraru is using classes that Silverlight does not have any references to, correct?

If this is the case, I would immediately look into using WPF instead of Silverlight, can you do this? The Bitmap class is really just a wrapper for a GDI+ image, which is why you wont really be able to use it in Silverlight.