WPF Dispatcher的使用



<Window x:Class="DispatcherExam.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>

        <StackPanel>

            <Label x:Name="lblHello">欢迎你光临WPF的世界!</Label>

            <Button Name="btnThd" Click="btnThd_Click">多线程同步调用</Button>

            <Button Name="btnAppBeginInvoke" Click="btnAppBeginInvoke_Click" >BeginInvoke 异步调用</Button>

        </StackPanel>

    </Grid>

</Window>

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading;

using System.Threading.Tasks;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;

using System.Windows.Threading;

namespace DispatcherExam

{

    /// <summary>

    /// Interaction logic for MainWindow.xaml

    /// </summary>

    public partial class MainWindow : Window

    {

        public MainWindow()

        {

            InitializeComponent();

            this.Dispatcher.Thread.Name = "MainThread";

        }

private void btnThd_Click(object sender, RoutedEventArgs e)

        {

            Thread th = new Thread(ModifyUI);

            th.Name = "SubThread";

            th.Start();

        }

        private void ModifyUI()

        {

// 模拟一些工作正在进行

Thread.Sleep(TimeSpan.FromSeconds(2));

//lblHello.Content = "欢迎你光临WPF的世界,Dispatcher";

            MessageBox.Show(this.Dispatcher.Thread.Name); //MainThread

            this.Dispatcher.Invoke(DispatcherPriority.Normal, (ThreadStart)delegate()

            {

                lblHello.Content = "欢迎你光临WPF的世界,Dispatche  同步方法 ！！";

});

}

private void btnAppBeginInvoke_Click(object sender, RoutedEventArgs e)

        {

            new Thread(() =>

            {

Application.Current.Dispatcher.BeginInvoke(DispatcherPriority.Normal,

new Action(() =>

                    {

Thread.Sleep(TimeSpan.FromSeconds(2));

this.lblHello.Content = "欢迎你光临WPF的世界,Dispatche 异步方法！！" + DateTime.Now.ToString();

}));

}).Start();

}

}

}