可能重复：
Attempted to read or write protected memory. When I call showDialog method of openfileDialog
我的项目是在winxp中创建的，现在已迁移到windows7。我点击项目中的openfiledialog图标时出现一个奇怪的异常，然后应用程序崩溃了。这只发生在我创建发布版本并在Windows 7中安装该版本时。
安装程序也是在Windows 7中创建的。在调试模式下运行代码时，我没有遇到此异常。
我将openfiledialog的initialdirectory属性设置为desktopdirectory。
以下是我在Windows事件查看器中捕获的异常跟踪。
Application: projectname.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.AccessViolationException
Stack:
at System.Windows.Forms.UnsafeNativeMethods.GetOpenFileName(OPENFILENAME_I)
at System.Windows.Forms.OpenFileDialog.RunFileDialog(OPENFILENAME_I)
at System.Windows.Forms.FileDialog.RunDialogOld(IntPtr)
at System.Windows.Forms.FileDialog.RunDialog(IntPtr)
at System.Windows.Forms.CommonDialog.ShowDialog(System.Windows.Forms.IWin32Window)
at System.Windows.Forms.CommonDialog.ShowDialog()
at companyname.projectname.MainForm.processFileOperation(FileOperationType)
at companyname.projectname.MainForm.fileOpenMenuItem_Click(System.Object, System.EventArgs)
at companyname.projectname.MainForm.toolBar_ButtonClick(System.Object, System.Windows.Forms.ToolBarButtonClickEventArgs)
at System.Windows.Forms.ToolBar.OnButtonClick(System.Windows.Forms.ToolBarButtonClickEventArgs)
at System.Windows.Forms.ToolBar.WmReflectCommand(System.Windows.Forms.Message ByRef)
at System.Windows.Forms.ToolBar.WndProc(System.Windows.Forms.Message ByRef)
at System.Windows.Forms.Control+ControlNativeWindow.OnMessage(System.Windows.Forms.Message ByRef)
at System.Windows.Forms.Control+ControlNativeWindow.WndProc(System.Windows.Forms.Message ByRef)
at System.Windows.Forms.NativeWindow.Callback(IntPtr, Int32, IntPtr, IntPtr)
at System.Windows.Forms.UnsafeNativeMethods.SendMessage(System.Runtime.InteropServices.HandleRef, Int32, IntPtr, IntPtr)
at System.Windows.Forms.Control.SendMessage(Int32, IntPtr, IntPtr)
at System.Windows.Forms.Control.ReflectMessageInternal(IntPtr, System.Windows.Forms.Message ByRef)
at System.Windows.Forms.Control.WmCommand(System.Windows.Forms.Message ByRef)
at System.Windows.Forms.Control.WndProc(System.Windows.Forms.Message ByRef)
at System.Windows.Forms.ScrollableControl.WndProc(System.Windows.Forms.Message ByRef)
at System.Windows.Forms.Form.WndProc(System.Windows.Forms.Message ByRef)
at System.Windows.Forms.Control+ControlNativeWindow.OnMessage(System.Windows.Forms.Message ByRef)
at System.Windows.Forms.Control+ControlNativeWindow.WndProc(System.Windows.Forms.Message ByRef)
at System.Windows.Forms.NativeWindow.Callback(IntPtr, Int32, IntPtr, IntPtr)
at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr, IntPtr, Int32, IntPtr, IntPtr)
at System.Windows.Forms.NativeWindow.DefWndProc(System.Windows.Forms.Message ByRef)
at System.Windows.Forms.Control.DefWndProc(System.Windows.Forms.Message ByRef)
at System.Windows.Forms.Control.WmMouseUp(System.Windows.Forms.Message ByRef, System.Windows.Forms.MouseButtons, Int32)
at System.Windows.Forms.Control.WndProc
(System.Windows.Forms.Message ByRef)
at System.Windows.Forms.ToolBar.WndProc(System.Windows.Forms.Message ByRef)
at System.Windows.Forms.Control+ControlNativeWindow.OnMessage(System.Windows.Forms.Message ByRef)
at System.Windows.Forms.Control+ControlNativeWindow.WndProc(System.Windows.Forms.Message ByRef)
at System.Windows.Forms.NativeWindow.Callback(IntPtr, Int32, IntPtr, IntPtr)
at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG ByRef)
at System.Windows.Forms.Application
+ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr, Int32, Int32)
at System.Windows.Forms.Application+ThreadContext.RunMessageLoopInner(Int32, System.Windows.Forms.ApplicationContext)
at System.Windows.Forms.Application+ThreadContext.RunMessageLoop(Int32, System.Windows.Forms.ApplicationContext)
at System.Windows.Forms.Application.Run(System.Windows.Forms.Form)
at companyname.projectname.MainForm.Main(System.String[])