System.AccessViolationException

  • Thread starter Thread starter James Arnold
  • Start date Start date
J

James Arnold

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

---

An unhandled exception of type 'System.AccessViolationException'
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!
 
James Arnold said:
I am getting the following error message in my WinForms project:

---

An unhandled exception of type 'System.AccessViolationException'
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.
Click to expand...

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.
Click to expand...

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?
Click to expand...

TreeNode.EndEdit perhaps

/claes
 
Source:
SourceLibrary.My.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.UnsafeNativeMethods.CallWindowProc(IntPtr
wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at System.Windows.Forms.NativeWindow.DefWndProc(Message& m)
at System.Windows.Forms.Control.DefWndProc(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.TreeView.WndProc(Message& m)
at
System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message&
m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32
msg, IntPtr wparam, IntPtr lparam)
 
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