WPFDispatcher示例

Dispatcher 类提供用于管理线程工作项队列的服务。

效果演示：

<Window x:Class="WPF之Dispatcher对象.MainWindow"

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

        Title="MainWindow" Height="" Width="">

    <Grid Background="BurlyWood" Height="" Width="">

        <Grid.ColumnDefinitions>

            <ColumnDefinition Width="184*" />

            <ColumnDefinition Width="172*" />

            <ColumnDefinition Width="147*" />

        </Grid.ColumnDefinitions>

        <Label Content="vlue:0" FontSize="" Height="" Margin="125,10,162,0" Name="label1" VerticalAlignment="Top" Grid.ColumnSpan="" />

        <Button Content="Dispatcher 回调界面线程" Height="" Margin="125,0,117,157" Name="button1" VerticalAlignment="Bottom" Grid.ColumnSpan="" Click="button1_Click" />

        <Button Content="直接更新UI界面线程" Height="" Margin="125,0,117,209" Name="button2" VerticalAlignment="Bottom" Grid.ColumnSpan="" Click="button2_Click" />

        <Button Content="同步更新UI界面线程" Height="" Margin="125,0,117,105" Name="button3" VerticalAlignment="Bottom" Grid.ColumnSpan="" Click="button3_Click" />

        <Button Content="异步更新UI界面线程" Height="" Margin="125,0,117,53" Name="button4" VerticalAlignment="Bottom" Grid.ColumnSpan="" Click="button4_Click" />

        <ProgressBar Height="" Margin="125,97,0,0" Name="progressBar1" VerticalAlignment="Top" Grid.ColumnSpan="" HorizontalAlignment="Left" Width="" />

        <Label Content="Dispatcher 应用" FontSize="" Height="" Margin="157,-142,135,0" Name="label3" VerticalAlignment="Top" Grid.ColumnSpan="" />

    </Grid>

</Window>

后台简答代码：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

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 WPF之Dispatcher对象

{

    /// <summary>

    /// MainWindow.xaml 的交互逻辑

    /// </summary>

    public partial class MainWindow : Window

    {

        public MainWindow()

        {

            InitializeComponent();

        }

        private void button2_Click(object sender, RoutedEventArgs e)

        {

            for (int i = ; i <= ; i++)

            {

                this.label1.Content = "value：" + i+"%";

                this.progressBar1.Value = i;

                System.Threading.Thread.Sleep();

                //不能引用  System.Windows.Forms中的DoEvents会降低性能

                System.Windows.Forms.Application.DoEvents();

            }

        }

        private void button1_Click(object sender, RoutedEventArgs e)

        {

            for (int i = ; i <= ; i++)

            {

                this.label1.Content = "value：" + i+"%";

                this.progressBar1.Value = i;

                System.Threading.Thread.Sleep();

                this.DoEvents();//调用扩展方法DoEvents刷新界面同步

            }

        }

        public delegate void delegateUI(string val);

        public void RefashUI(string val)

        {

            this.label1.Content = "value：" + val+"%";

            this.progressBar1.Value = int.Parse(val);

        }

        private void button3_Click(object sender, RoutedEventArgs e)

        {

            for (int i = ; i <= ; i++)

            {

                this.Dispatcher.Invoke(new delegateUI(RefashUI), //同步执行

                    DispatcherPriority.Normal, //优先级设置

                    new string[] { i.ToString() });

                System.Threading.Thread.Sleep();

                this.DoEvents();

            }

        }

        private void button4_Click(object sender, RoutedEventArgs e)

        {

            for (int i = ; i <= ; i++)

            {

                this.Dispatcher.BeginInvoke(new delegateUI(RefashUI),//异步执行

                    DispatcherPriority.Normal,

                    new string[] { i.ToString() });

                System.Threading.Thread.Sleep();

                this.DoEvents();

                //也可以用这种方法启动线程，设置线程优先级

                //this.Dispatcher.Thread.Start();

                //this.Dispatcher.Thread.Priority = System.Threading.ThreadPriority.Highest;

            }

        }

    }

    //一个扩展的自定义DoEvents,可以直接使用我们的项目中

    public static class WindowEX

    {

        public static void DoEvents(this MainWindow win)

        {

            DispatcherFrame frame = new DispatcherFrame();

            Dispatcher.CurrentDispatcher.BeginInvoke(DispatcherPriority.Background,

                new DispatcherOperationCallback(ExitFrames), frame);

            Dispatcher.PushFrame(frame);

        }

        public static object ExitFrames(object f)

        {

            ((DispatcherFrame)f).Continue = false;

            return null;

        }

    }

}

上面展示了Dispatcher对象简单的运用，更多的用法http://msdn.microsoft.com/zh-cn/library/vstudio/System.Windows.Threading.Dispatcher.aspx

下载：http://files.cnblogs.com/BABLOVE/WPF%E4%B9%8BDispatcher%E5%AF%B9%E8%B1%A1.rar