调用MessageBox.Show没有来得及弹出对话框再次调用MessageBox.Show引起0x8000FFFF异常

调用MessageBox.Show没有来得及弹出对话框再次调用MessageBox.Show引起0x8000FFFF异常，解决方法：

        private static mMsgboxShown = false;

        public static MessageBoxResult ShowMessageBox(string text,stringcaption,MessageBoxButtonmsgBoxBtn)

        {

           MessageBoxResult ret =MessageBoxResult.None;

           if (!mMsgboxShown)

           {

               mMsgboxShown = true;

               ret = MessageBox.Show(text, caption,msgBoxBtn);

               mMsgboxShown = false;

           }

           return ret;

        }

 

下面是捕获到的异常：  

//try
{
    if (MessageBox.Show("是否退出***？\n点击确认，退出。\n点击取消，继续使用。",
        "退出程序：", MessageBoxButton.OKCancel) == MessageBoxResult.Cancel)
    {
        e.Cancel = true;
    }
}
//catch (Exception err)
//{
//    Message "0x8000ffff"
//    StackTrace 
//        "at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
//        at MS.Internal.XcpImports.MessageBox_ShowCore(String messageBoxText, String caption, UInt32 type)
//        at System.Windows.MessageBox.ShowCore(String messageBoxText, String caption, MessageBoxButton button)
//        at System.Windows.MessageBox.Show(String messageBoxText, String caption, MessageBoxButton button)
//        at BaseClass.BasicPhoneApplicationPage.PhoneApplicationPageModel.PhoneApplicationPage_BackKeyPress(Object sender, CancelEventArgs e)
//        at Microsoft.Phone.Controls.PhoneApplicationPage.ShellPageCallback_OnBackKeyPress(Object source, BackKeyPressEventArgs e)
//        at Microsoft.Phone.Shell.Interop.ShellPageCallback.FireOnBackKeyPress(IntPtr pageThis)

//        at MS.Internal.XcpImports.MessageBox_ShowCoreNative(IntPtr context, String messageBoxText, String caption, UInt32 type, Int32& result)

//        at MS.Internal.XcpImports.MessageBox_ShowCore(String messageBoxText, String caption, UInt32 type)
//        at System.Windows.MessageBox.ShowCore(String messageBoxText, String caption, MessageBoxButton button)
//        at System.Windows.MessageBox.Show(String messageBoxText, String caption, MessageBoxButton button)
//        at BaseClass.BasicPhoneApplicationPage.PhoneApplicationPageModel.PhoneApplicationPage_BackKeyPress(Object sender, CancelEventArgs e)
//        at Microsoft.Phone.Controls.PhoneApplicationPage.ShellPageCallback_OnBackKeyPress(Object source, BackKeyPressEventArgs e)
//        at Microsoft.Phone.Shell.Interop.ShellPageCallback.FireOnBackKeyPress(IntPtr pageThis)"
//}