protected override void OnBackKeyPress(System.ComponentModel.CancelEventArgs e) { //if (MessageBox.Show("是否要退出?", "提示", MessageBoxButton.OKCancel) == MessageBoxResult.OK) //{ // m_d3dBackground.ONSExit(); //} m_d3dBackground.BackKeyPressed(); e.Cancel = true; base.OnBackKeyPress(e); }