UWP消息通知

在Windows 10通常是使用Toast通知方式进行的消息通知，但是在应用通知是不需要通知带有音效的，但是又不能在系统通知中心留下记录，那么需要监听ToastNotification实例的Dismissed事件，利用ToastNotificationManager.History.Remove(toastTag)实现Toast通知在之后消失。
但是在PC上使用是由于通知中心在右下角，对用户可能不是太友好。
所以可以通过Popup+UserControl实现应用内的消息通知。当然实现方法也有很多，用处也不知消息通知，例如：[模态框进度指示器的实现](http://edi.wang/post/2016/2/25/windows-10-uwp-modal-progress-dialog) 。
UWP中实现时就是布置好UserControl的模板，然后延迟一秒之后执行淡出动画。

     <UserControl.Resources>
         <Storyboard x:Name="Notification" >
             <DoubleAnimationUsingKeyFrames Storyboard.TargetName="NotificationGrid"
                                            Storyboard.TargetProperty="Opacity" BeginTime="0:0:0">
                 <SplineDoubleKeyFrame KeyTime="0:0:0.0" Value="1"/>
                 <SplineDoubleKeyFrame KeyTime="0:0:0.5" Value="0.0"/>
             </DoubleAnimationUsingKeyFrames>
         </Storyboard>
     </UserControl.Resources>
     <Grid Name="NotificationGrid">
         <Grid.RowDefinitions>
             <RowDefinition/>
             <RowDefinition/>
         </Grid.RowDefinitions>
             <Border Grid.Row="1" HorizontalAlignment="Center" VerticalAlignment="Bottom" Margin="0,50" Padding="20,15" Background="Black"  >
                 <TextBlock Name="NotificationContent" TextWrapping="Wrap"  Foreground="#daffffff"></TextBlock>
             </Border>
     </Grid>

然后在cs中加入三个成员变量，分别是存储提示内容，自定延迟时间，还有就是用来显示的Popup类型的成员变量。
myNotification.xaml.cs

 public sealed partial class myNotification : UserControl
     {
         private string content;
         private TimeSpan showTime;
         private Popup popup;
         private myNotification()
         {
             this.InitializeComponent();
             this.popup = new Popup();
             this.Width = Window.Current.Bounds.Width;
             this.Height = Window.Current.Bounds.Height;
             popup.Child = this;
             this.Loaded += Notification_Loaded;
             this.Unloaded += Notification_Unloaded;
         }
         public myNotification(string content,TimeSpan showTime):this()
         {
             this.content = content;
             this.showTime = showTime;
         }
         public myNotification(string content):this(content,TimeSpan.FromSeconds())
         {
 
         }
         public void show()
         {
             this.popup.IsOpen = true;
         }
         private void Notification_Unloaded(object sender, RoutedEventArgs e)
         {
             Window.Current.SizeChanged -= Current_SizeChanged;
         }
 
         private void Notification_Loaded(object sender, RoutedEventArgs e)
         {
             NotificationContent.Text = this.content;
             this.Notification.BeginTime = this.showTime;
             this.Notification.Begin();
             this.Notification.Completed += Notification_Completed;
             Window.Current.SizeChanged += Current_SizeChanged;
         }
 
         private void Current_SizeChanged(object sender, Windows.UI.Core.WindowSizeChangedEventArgs e)
         {
             this.Width = e.Size.Width;
             this.Height = e.Size.Height;
         }
 
         private void Notification_Completed(object sender, object e)
         {
             this.popup.IsOpen = false;
         }
     }

然后在MainPage.xaml中加入一个button，并加入click事件来显示通知。
在click事件中加入：

new myNotification("Hello Wrold").show();

运行效果：