来自组合的 AccessViolationException:尝试读取或写入受保护的内存 [英] AccessViolationException from a combo: Attempted to read or write protected memory

问题描述

用户在使用我们的应用程序(VB.Net、Winforms、使用框架的 v2)时偶尔会遇到上述错误.我无法重现它.调用栈如下:

Users are occassionally getting the above error when using our application (VB.Net, Winforms, using v2 of the framework). I'm not able to reproduce it. The callstack is as follows:

: System.AccessViolationException: 试图读取或写入受保护的内存.这通常表明其他内存已损坏.在 System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)在 System.Windows.Forms.NativeWindow.DefWndProc(Message& m)在 System.Windows.Forms.Control.DefWndProc(Message& m)在 System.Windows.Forms.Control.WndProc(Message& m)在 System.Windows.Forms.ComboBox.WndProc(Message& m)在 ControlEx.AutoCompleteCombo.WndProc(Message& m)在 System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)在 System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)在 System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

: System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. 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.ComboBox.WndProc(Message& m) at ControlEx.AutoCompleteCombo.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)

ControlEx.AutoCompleteCombo.WndProc的代码如下:

The code for ControlEx.AutoCompleteCombo.WndProc is as follows:

Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
    Try
        If Not m_fReadOnly Then
            MyBase.WndProc(m)
        Else
            Select Case m.Msg
                Case WM_LBUTTONDOWN, WM_LBUTTONDBLCLK
                    ' do nothing
                Case Else
                    MyBase.WndProc(m)
            End Select
        End If
    Catch ex As OutOfMemoryException
        Throw New OutOfMemoryException("Exception during WndProc for combo " & Me.Name, ex)
    End Try
End Sub

添加了错误处理，以便我们可以在遇到 OutOfMemoryException 时确定哪个组合导致了问题.

The error handling was added so we can determine which combo causes the problem when we get an OutOfMemoryException.

任何有关导致这种情况的原因的线索将不胜感激！:-)

Any clues as to what causes this would be muchly appreciated! :-)

推荐答案

我对代码中的 OutOfMemoryException 有一种奇怪的不确定感.

I have a strange non-deterministic feeling with the OutOfMemoryException in your code.

你为什么需要那个?如果您需要它，这可能是您遇到问题的原因吗?OutOfMemoryExceptions 非常罕见.如果你有这些，我认为这是一个强烈的迹象，表明其他地方出了问题.

Why do you need that? And if you need it, may this be the cause of your problems? OutOfMemoryExceptions are very rare. If you have these, I would think it is a strong indication something else is wrong.

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