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I'm trying to redefine WndProc on a Windows.Forms control because I want to disable painting updates under certain conditions but I run into a problem:

As soon as I insert this code into my app..

  override this.WndProc (m : System.Windows.Forms.Message byref) =
    let m2 = m in
    base.WndProc (ref m2)

.. it crashes at startup (when loading that form).

{"Error creating window handle."}    System.Exception {System.ComponentModel.Win32Exception}

It doesn't even matter what I am write as code. Same crash for

  override this.WndProc (m : System.Windows.Forms.Message byref) =
    ()

Does anybody know what I'm doing wrong? Have you succeed at overriding WndProc?

Hi,

You can try this way:

    override this.WndProc (m : System.Windows.Forms.Message byref) =
        let m2 = &m in
        base.WndProc (&m2)

That worked. Thanks.

(found some more explanation here http://research.microsoft.com/fsharp/manual/lexyacc.aspx#ByRefs)