WP8.1按返回键出现对话框确认退出，如何实现？

Question

实现如图的效果。

Answer 1

您好,

在windows phone 8.1 中你需要对话框命令来实现确定取消的功能，具体请参考下面的代码：

protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            // TODO: Prepare page for display here.

            // TODO: If your application contains multiple pages, ensure that you are
            // handling the hardware Back button by registering for the
            // Windows.Phone.UI.Input.HardwareButtons.BackPressed event.
            // If you are using the NavigationHelper provided by some templates,
            // this event is handled for you.
            Windows.Phone.UI.Input.HardwareButtons.BackPressed += HardwareButtons_BackPressed;
        }

        private void HardwareButtons_BackPressed(object sender, Windows.Phone.UI.Input.BackPressedEventArgs e)
        {
            MessageDialog msgDialog = new MessageDialog("Your message", "Your title");

            //OK Button
            UICommand okBtn = new UICommand("OK");
            okBtn.Invoked = OkBtnClick;
            msgDialog.Commands.Add(okBtn);

            //Cancel Button
            UICommand cancelBtn = new UICommand("Cancel");
            cancelBtn.Invoked = CancelBtnClick;
            msgDialog.Commands.Add(cancelBtn);

            //Show message
            msgDialog.ShowAsync();

        }

        private void CancelBtnClick(IUICommand command)
        {
            return;
        }

        private void OkBtnClick(IUICommand command)
        {
            Application.Current.Exit();
        }

更多信息请参考MSDN官方文档：https://msdn.microsoft.com/zh-cn/library/windows/apps/windows.ui.popups.messagedialog.aspx

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Answer 2

谢谢你的回答。