How can I write an extension method that converts a System.Drawing.Bitmap to a byte array?

Posted by Patrick Szalapski on Stack Overflow See other posts from Stack Overflow or by Patrick Szalapski
Published on 2011-01-12T16:47:51Z Indexed on 2011/01/12 16:53 UTC
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How can I write an extension method that converts a System.Drawing.Bitmap to a byte array? Why not:

<Extension()> _
Public Function ToByteArray(ByVal image As System.Drawing.Bitmap) As Byte()
    Using ms = New MemoryStream()
        image.Save(ms, image.RawFormat)
        Return ms.ToArray()
    End Using
End Function

Yet when I use that, I get "System.Runtime.InteropServices.ExternalException: A generic error occurred in GDI+." What am I doing wrong?

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