我之前开发一个软件 winMarkdown，这个软件在关闭需要提示用户还没有保存东西，需要保存，如果用户选择退出，那么把数据存放。 在Metro程序中，没有传统的窗口，当我们要用需要交互的消息提示时，在Win8时代，引入了一个MessageDialog来取代常用的MessageBox。 我在MainPage，挂起`App.Current.Suspending += suspend;` ~~~ private async void suspend(object sender, Windows.ApplicationModel.SuspendingEventArgs e) { SuspendingDeferral deferral = e.SuspendingOperation.GetDeferral(); MessageDialog message_dialog = new MessageDialog("当前还在运行，确定退出", "退出"); message_dialog.Commands.Add(new UICommand("确定", 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();`挂起还要做，直到`deferral.Complete();` ~~~ MessageDialog message_dialog = new MessageDialog("当前还在运行，确定退出", "退出"); message_dialog.Commands.Add(new UICommand("确定", cmd => { }, "退出")); message_dialog.Commands.Add(new UICommand("取消", cmd => { })); ~~~ 两个按钮，一个确定，一个取消，可以UICommand ID作为点击后，是哪个按钮点击 ~~~ MessageDialog.DefaultCommandIndex按ESC选择按钮 MessageDialog.CancelCommandIndex按enter按钮 ~~~ ~~~ IUICommand result = await message_dialog.ShowAsync(); if (result.Id as string == "退出") { } ~~~ 程序要调试挂起，需要生命周期，点击挂起   我们按enter就会点击确定 而我们对于MessageDialog功能还是觉得不够，ContentDialog可以定义复杂的Xaml自定义 我们把MessageDialog换ContentDialog ~~~ ContentDialog content_dialog = new ContentDialog() { Title = "退出", Content = "当前还在运行，确定退出", PrimaryButtonText = "确定", 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="当前还在运行，确定退出"></TextBlock> <CheckBox Grid.Row="1" Content="保存"></CheckBox> </Grid> </UserControl> ~~~ ~~~ ContentDialog content_dialog = new ContentDialog() { Title = "退出", Content = new content(), PrimaryButtonText = "确定", SecondaryButtonText = "取消", FullSizeDesired = false, }; content_dialog.PrimaryButtonClick += (_s, _e) => { }; await content_dialog.ShowAsync(); ~~~  参见：  [http://www.cnblogs.com/TianFang/p/4857205.html](http://www.cnblogs.com/TianFang/p/4857205.html)