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Is there a way to get a DrawingContext (or something similar) for a WriteableBitmap? I.e. something to allow you to call simple DrawLine/DrawRectangle/etc kinds of methods, rather than manipulate the raw pixels directly.
It appears the word is no.
For future reference, we plan to use a port of the Writeable Bitmap Extensions for WPF.
For a solution using purely existing code, any of the other suggestions mentioned below will work.