System.AccessViolationException

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  • James Arnold
    #1

    System.AccessViolationException

    I am getting the following error message in my WinForms project:

    ---

    An unhandled exception of type 'System.AccessV iolationExcepti on'
    occurred in System.Windows. Forms.dll

    Additional information: Attempted to read or write protected memory.
    This is often an indication that other memory is corrupt.

    ---

    I have narrowed the problem down to a TreeView - if the user is
    currently editing the label of a TreeNode (using node.BeginEdit) and I
    then add a new node to the TreeView, the exception gets thrown.

    However - I cannot seem to programatically end the editing of the
    TreeNode first (assuming that will stop the error). Can anyone direct
    me to a solution please?

    Thanks!

    Tags: None
    • Claes Bergefall
      #2
      Re: System.AccessVi olationExceptio n

      "James Arnold" <jarnie@gmail.c omwrote in message
      news:1161795773 .732002.253280@ e3g2000cwe.goog legroups.com...
      >I am getting the following error message in my WinForms project:
      >
      ---
      >
      An unhandled exception of type 'System.AccessV iolationExcepti on'
      occurred in System.Windows. Forms.dll
      >
      Additional information: Attempted to read or write protected memory.
      This is often an indication that other memory is corrupt.
      >
      ---
      >
      Do you get any callstack or any other useful information?

      I have narrowed the problem down to a TreeView - if the user is
      currently editing the label of a TreeNode (using node.BeginEdit) and I
      then add a new node to the TreeView, the exception gets thrown.
      Where/how are you adding the new node?
      Can you reproduce the problem in a small program?

      However - I cannot seem to programatically end the editing of the
      TreeNode first (assuming that will stop the error). Can anyone direct
      me to a solution please?
      TreeNode.EndEdi t perhaps

      /claes


        Comment

        • James Arnold
          #3
          Re: System.AccessVi olationExceptio n

          Source:
          SourceLibrary.M y.MyApplication
          =IntPtr CallWindowProc( IntPtr, IntPtr, Int32, IntPtr, IntPtr)

          Message:
          Attempted to read or write protected memory. This is often an
          indication that other memory is corrupt.

          StackTrace:
          at System.Windows. Forms.UnsafeNat iveMethods.Call WindowProc(IntP tr
          wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
          at System.Windows. Forms.NativeWin dow.DefWndProc( Message& m)
          at System.Windows. Forms.Control.D efWndProc(Messa ge& m)
          at System.Windows. Forms.Control.W ndProc(Message& m)
          at System.Windows. Forms.TreeView. WndProc(Message & m)
          at
          System.Windows. Forms.Control.C ontrolNativeWin dow.OnMessage(M essage& m)
          at System.Windows. Forms.Control.C ontrolNativeWin dow.WndProc(Mes sage&
          m)
          at System.Windows. Forms.NativeWin dow.Callback(In tPtr hWnd, Int32
          msg, IntPtr wparam, IntPtr lparam)

          Claes Bergefall wrote:
          "James Arnold" <jarnie@gmail.c omwrote in message
          news:1161795773 .732002.253280@ e3g2000cwe.goog legroups.com...
          I am getting the following error message in my WinForms project:

          ---

          An unhandled exception of type 'System.AccessV iolationExcepti on'
          occurred in System.Windows. Forms.dll

          Additional information: Attempted to read or write protected memory.
          This is often an indication that other memory is corrupt.

          ---
          >
          Do you get any callstack or any other useful information?
          >
          >
          I have narrowed the problem down to a TreeView - if the user is
          currently editing the label of a TreeNode (using node.BeginEdit) and I
          then add a new node to the TreeView, the exception gets thrown.
          >
          Where/how are you adding the new node?
          Can you reproduce the problem in a small program?
          >
          >
          However - I cannot seem to programatically end the editing of the
          TreeNode first (assuming that will stop the error). Can anyone direct
          me to a solution please?
          >
          TreeNode.EndEdi t perhaps
          >
          /claes

            Comment

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