MemoryStream.Position or MemoryStream.Seek does not work (Silverlight)

I have a memorystream i开发者_运维技巧n a silverlight app. I have to copy this memorystream to a filestream object. If I call:

memoryStream.Position = 0;
memoryStream.Seek(0,SeekOrigin.Begin);

It does not work, I debug the application, check the properties of the memorystream, and the position still points to the end of the file. Any clues?

Is it possible that another of your properties is being triggered in the debugger, and reading through the stream?

Rather than using the debugger, what happens if you log (or show on a message box):

Log("Position = " + stream.Position);
stream.Position = 0;
Log("Position = " + stream.Position);

Does that show the same non-zero number twice? I find it hard to believe that MemoryStream is that broken.

Btw, a simpler way of using MemoryStream for copying than manually copying everything is to call WriteTo with the FileStream as an argument.