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

当使用我们的应用程序（VB.Net，Winforms，使用框架的v2）时，用户偶尔会遇到上述错误。我无法重现它。调用堆栈如下：

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：尝试读取或写入受保护的内存。这通常表明其他内存已损坏。
at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc（IntPtr wndProc，IntPtr hWnd，Int32 msg，IntPtr wParam，IntPtr lParam）
在System.Windows.Forms.NativeWindow.DefWndProc（Message& m）
at System.Windows.Forms.Control.DefWndProc（Message& m）
在System.Windows.Forms.Control.WndProc（Message& m）
在System.Windows.Forms.ComboBox。 System.Windows上的System.Windows.Forms.Control.ControlNativeWindow.OnMessage（Message& m）
处的ControlEx.AutoCompleteCombo.WndProc（Message& m）
中的WndProc（Message& m）
.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

错误处理添加，所以我们可以确定当我们得到一个OutOfMemoryException时，哪个组合导致的问题。

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

任何线索，什么原因，将非常感谢！ ： - ）

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

推荐答案

我在代码中有一个奇怪的非确定性的OutOfMemoryException。

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

你为什么需要？如果你需要它，这可能是你的问题的原因？ OutOfMemoryExceptions是非常罕见的。如果你有这些，我会认为这是一个强烈的迹象，其他的错误。

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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