DispatcherTimer 应用实例

    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            //实例化
            DispatcherTimer dis = new DispatcherTimer() 
            {
                Interval = TimeSpan.FromMilliseconds(10)
            };
            dis.Tick += dis_Tick;//写完+=之后按两下Tab可自动创建void dis_Tick(object sender, EventArgs e)
            dis.Start();//dis.Stop();
        }
        double ProgressValue = 0;
        void dis_Tick(object sender, EventArgs e)
        {
            if (ProgressValue <= myCan.Width)
            {
                myBorder.Width = ProgressValue++;
            }
            else
            {
                ProgressValue = 0;
            }
        }
    }

<Window x:Class="ProgressMask.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>       
        <Canvas Name="myCan" Height="50" Width="500" Background="LightGray">
            <Border Name="myBorder" Background="Green" Height="50" Panel.ZIndex="10" Width="10"></Border>
        </Canvas> 
    </Grid>
</Window>