Question

我有一个消息对话框，显示两个按钮nav-to-page1和nav-to-page2按钮，意味着我限制用户导航到page1或page2。

我遇到一个问题，万一打开消息对话框，按回按钮，按此行为关闭我的消息对话框。

我可以在消息对话框未打开时覆盖后退按钮。当对话框打开时，我想覆盖后退按钮。

MessageDialog dlg = new MessageDialog("Are you sure you want to quit you will loose all your work ?", "Warning");
dlg.Commands.Add(new UICommand("nav-to-page1", new UICommandInvokedHandler(CommandHandler1)));
dlg.Commands.Add(new UICommand("nav-to-page2", new UICommandInvokedHandler(CommandHandler1)));

await dlg.ShowAsync();

非常感谢任何帮助

Answer 1

默认情况下，关闭Backkeypress上的messagedialog。不要认为你可以覆盖这种行为，因为它在messagedialog打开时没有点击backkeypress方法。一个建议：现在当您按下后退按钮时，它将其作为命令并进入“CommandHandler1”方法。要在创建命令时避免这种情况，请添加一些命令ID，如

private async void gv_Tapped(object sender, TappedRoutedEventArgs e)
    {
        GridView gvi = sender as GridView;
        MessageDialog dlg = new MessageDialog("Are you sure you want to quit you will loose all your work ?", "Warning");
        dlg.Commands.Add(new UICommand("nav-to-page1", new UICommandInvokedHandler(CommandHandler1), 0));
        dlg.Commands.Add(new UICommand("nav-to-page2", new UICommandInvokedHandler(CommandHandler1),1));

        await dlg.ShowAsync();
    }



    private void CommandHandler1(IUICommand command)
    {
       // throw new NotImplementedException();
    }

消息对话框打开时，Windows Phone 8.1覆盖后退按钮

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