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(1))
        {
           
        }
        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：