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;

[mw_shl_code=csharp,true]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();
}[/mw_shl_code]


SuspendingDeferral deferral = e.SuspendingOperation.GetDeferral();挂起还要做，直到deferral.Complete();
[mw_shl_code=csharp,true] 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 => { }));[/mw_shl_code]


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
[mw_shl_code=csharp,true]MessageDialog.DefaultCommandIndex按ESC选择按钮
MessageDialog.CancelCommandIndex按enter按钮[/mw_shl_code]


[mw_shl_code=csharp,true] IUICommand result = await message_dialog.ShowAsync();
if (result.Id as string == "退出")
{

}[/mw_shl_code]

程序要调试挂起，需要生命周期，点击挂起
***附件停止解析***


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
[mw_shl_code=csharp,true]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();[/mw_shl_code]

***附件停止解析***

[mw_shl_code=csharp,true]<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>[/mw_shl_code]


[mw_shl_code=csharp,true] 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();[/mw_shl_code]

***附件停止解析***

参见：***链接停止解析***

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