c# - 类似于 StackOverflow 的 WPF Alert 控件

Question

寻找类似于 SO 如何使用 Javascript 在浏览器顶部显示警报的 WPF 控件（如此处所述通知警报类似于 stackoverflow 的功能）

系统托盘上方显示了一堆用于通知的 WPF 控件

http://www.hardcodet.net/projects/wpf-notifyicon

http://nickeandersson.blogs.com/blog/2007/12/a-wpf-desktop-a.html

但是我希望在当前窗口或用户控件的顶部显示消息，并带有定时淡出以保持消息本地/相关

我是 WPF 新手，所以不知道如何将上面链接的控件定位到当前窗口/用户控件的顶部 - 任何提示/指针都值得赞赏

Answer 1

使用 DockPanel 作为窗口内的基本面板。将用户控件设置为 DockPanel.Dock=Top。使用另一个面板填充剩余空间。

至于淡出，您可以根据计时器为整个用户控件的不透明度设置动画，当不透明度达到 0 时，将可见性设置为折叠，这样它就不会再占用空间了。

Answer 2

试试这个。

后面的代码。

public partial class dtfromdataset : Window
    {
        public dtfromdataset()
        {
            InitializeComponent();


            this.DataContext = this;

            time.Interval = 5000;
            time.Elapsed += new ElapsedEventHandler(time_Elapsed);
            time.Start();
        }
        Timer time = new Timer();



        void time_Elapsed(object sender, ElapsedEventArgs e)
        {
            Dispatcher.BeginInvoke(new Action(() =>
            {
                StatusBarText = "Time is " + DateTime.Now.ToString("ddd-MM-yy HH:mm:ss tt");
            }));
        }

        private DataTable dt = new DataTable();

        public string StatusBarText
        {
            get { return (string)GetValue(StatusBarTextProperty); }
            set { SetValue(StatusBarTextProperty, value); }
        }

        // Using a DependencyProperty as the backing store for StatusBarText.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty StatusBarTextProperty =
            DependencyProperty.Register("StatusBarText", typeof(string), typeof(dtfromdataset), new UIPropertyMetadata(""));

}

Xaml

   <Grid Name="stackPanel1">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="224*" />
        </Grid.RowDefinitions>
        <TextBlock Name="statusText"
                   Grid.Row="0"
                   HorizontalAlignment="Stretch"
                   Background="Silver"
                   FontSize="20"
                   Text="{Binding Path=StatusBarText,
                                  NotifyOnTargetUpdated=True}"
                   TextAlignment="Center">
            <TextBlock.Triggers>
                <EventTrigger RoutedEvent="Binding.TargetUpdated">
                    <BeginStoryboard>
                        <Storyboard>
                            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity">
                                <EasingDoubleKeyFrame KeyTime="0" Value="0" />
                                <EasingDoubleKeyFrame KeyTime="0:0:0.25" Value="1" />
                                <EasingDoubleKeyFrame KeyTime="0:0:4" Value="1" />
                                <EasingDoubleKeyFrame KeyTime="0:0:5" Value="0" />
                            </DoubleAnimationUsingKeyFrames>
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
            </TextBlock.Triggers>
        </TextBlock>
</Grid>