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();

        }

    }
}