我之前開發一個軟件 winMarkdown，這個軟件在關閉需要提示用戶還沒有保存東西，需要保存，如果用戶選擇退出，那么把數據存放。 在Metro程序中，沒有傳統的窗口，當我們要用需要交互的消息提示時，在Win8時代，引入了一個MessageDialog來取代常用的MessageBox。 我在MainPage，掛起`App.Current.Suspending += suspend;` ~~~ private async void suspend(object sender, Windows.ApplicationModel.SuspendingEventArgs e) { SuspendingDeferral deferral = e.SuspendingOperation.GetDeferral(); MessageDialog message_dialog = new MessageDialog("當前還在運行，確定退出", "退出"); message_dialog.Commands.Add(new UICommand("確定", cmd => { }, "退出")); message_dialog.Commands.Add(new UICommand("取消", cmd => { })); message_dialog.DefaultCommandIndex = 0; message_dialog.CancelCommandIndex = 1; IUICommand result = await message_dialog.ShowAsync(); if (result.Id as string == "退出") { } deferral.Complete(); } ~~~ `SuspendingDeferral deferral = e.SuspendingOperation.GetDeferral();`掛起還要做，直到`deferral.Complete();` ~~~ MessageDialog message_dialog = new MessageDialog("當前還在運行，確定退出", "退出"); message_dialog.Commands.Add(new UICommand("確定", cmd => { }, "退出")); message_dialog.Commands.Add(new UICommand("取消", cmd => { })); ~~~ 兩個按鈕，一個確定，一個取消，可以UICommand ID作為點擊后，是哪個按鈕點擊 ~~~ MessageDialog.DefaultCommandIndex按ESC選擇按鈕 MessageDialog.CancelCommandIndex按enter按鈕 ~~~ ~~~ IUICommand result = await message_dialog.ShowAsync(); if (result.Id as string == "退出") { } ~~~ 程序要調試掛起，需要生命周期，點擊掛起?  我們按enter就會點擊確定 而我們對于MessageDialog功能還是覺得不夠，ContentDialog可以定義復雜的Xaml自定義 我們把MessageDialog換ContentDialog ~~~ ContentDialog content_dialog = new ContentDialog() { Title = "退出", Content = "當前還在運行，確定退出", PrimaryButtonText = "確定", SecondaryButtonText = "取消", FullSizeDesired = true, }; content_dialog.PrimaryButtonClick += (_s, _e) => { }; await content_dialog.ShowAsync(); ~~~  ~~~ <UserControl x:Class="produproperty.content" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="using:produproperty" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400"> <Grid> <Grid.RowDefinitions> <RowDefinition></RowDefinition> <RowDefinition></RowDefinition> </Grid.RowDefinitions> <TextBlock Grid.Row="0" Text="當前還在運行，確定退出"></TextBlock> <CheckBox Grid.Row="1" Content="保存"></CheckBox> </Grid> </UserControl> ~~~ ~~~ ContentDialog content_dialog = new ContentDialog() { Title = "退出", Content = new content(), PrimaryButtonText = "確定", SecondaryButtonText = "取消", FullSizeDesired = false, }; content_dialog.PrimaryButtonClick += (_s, _e) => { }; await content_dialog.ShowAsync(); ~~~  參見：? [http://www.cnblogs.com/TianFang/p/4857205.html](http://www.cnblogs.com/TianFang/p/4857205.html)