WPF多线程演示

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WPF中的几种处理线程的工作方式：

1.简单的DispatcherTimer类似Timer控件

2.需要处理UI同步时，Dispatcher DispatcherOpertion

3.增强的Thread对象 System.Windows.Threading

4.BackgroundWorker组建对象

下面看下展示着几种处理方式：xaml文件

<Window x:Class="WPF多线程演示.MainWindow"

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

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

        Title="MainWindow" Height="" Width="" Background="BlanchedAlmond">

    <Grid>

        <Label Content="UI多线程演示" FontSize="" Height="" Margin="139,28,205,0" Name="label1" VerticalAlignment="Top" />

        <Button Content="DispatcherTimer" Height="" Margin="103,73,129,0" Name="button1" VerticalAlignment="Top" Click="button1_Click" />

        <Button Content="DispatcherThread" Height="" Margin="103,116,129,0" Name="button2" VerticalAlignment="Top" Click="button2_Click" />

        <Button Content="Thread" Margin="103,167,129,111" Name="button3" Click="button3_Click" />

        <Button Content="BackgroundWorker" Height="" Margin="103,0,129,65" Name="button4" VerticalAlignment="Bottom" Click="button4_Click" />

        <ProgressBar Height="" Margin="64,0,103,24" Name="progressBar1" VerticalAlignment="Bottom" />

        <Label Height="" HorizontalAlignment="Right" Margin="0,252,22,0" Name="label2" VerticalAlignment="Top" Width="" />

    </Grid>

</Window>

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;

//引入线程命名空间

using System.Windows.Threading;

namespace WPF多线程演示

{

    /// <summary>

    /// MainWindow.xaml 的交互逻辑

    /// </summary>

    public partial class MainWindow : Window

    {

        public MainWindow()

        {

            InitializeComponent();

        }

        //方式一

        DispatcherTimer tm = new DispatcherTimer();//实例化一个DispatcherTimer对象

        private void button1_Click(object sender, RoutedEventArgs e)

        {

            tm.Tick += new EventHandler(tm_Tick);//订阅Tick事件

            tm.Interval = TimeSpan.FromSeconds(0.05);

            tm.Start();

            // tm.Stop();

        }

        void tm_Tick(object sender, EventArgs e)

        {

            if (progressBar1.Value<=)

            {

                progressBar1.Value++;

                this.label2.Content = progressBar1.Value++ +"%";

            }

            else

            {

                tm.Stop();

            }

        }

        //方式二

        public void newActionThread(int value)

        {

            this.progressBar1.Value = value;

            this.label2.Content = progressBar1.Value++ + "%";

            System.Threading.Thread.Sleep();

        }

        // 使用线程 方法

        public void DispatcherThread()

        {

            Dispatcher newDispatcher = Dispatcher.CurrentDispatcher;//提供线程工作环境

            Action<int> newAction = new Action<int>(this.newActionThread);

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

            {

                newDispatcher.Invoke(newAction, i);

                System.Threading.Thread.Sleep();

                this.DoEvents();

                //   newDispatcher.Thread.Abort();

            }

        }

        private void button2_Click(object sender, RoutedEventArgs e)

        {

            DispatcherThread();

        }

        //方式三

        public void newActionThread2(object value)

        {

            Action<int> newAction = new Action<int>(this.newActionThread);

            this.progressBar1.Dispatcher.Invoke(newAction, (int)value);//同步执行指定的委托

            System.Threading.Thread.Sleep();

        }

        public void Thread()

        {

            //winform中的线程

            //  System.Threading.Thread;

            //wpf环境中的线程

            //System.Windows.Threading.Dispatcher.CurrentDispatcher.Thread

            System.Threading.ParameterizedThreadStart ts = new System.Threading.ParameterizedThreadStart(this.newActionThread2);//一个线程执行委托

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

            {

                System.Threading.Thread t = new System.Threading.Thread(ts);

                System.Threading.Thread.Sleep();

                t.Start(i);

                this.label2.Content = progressBar1.Value++ + "%";

                this.DoEvents();//界面刷新

            }

        }

        private void button3_Click(object sender, RoutedEventArgs e)

        {

            Thread();

        }

        //方式四BackgroundWorker

        //http://msdn.microsoft.com/zh-cn/library/vstudio/system.componentmodel.backgroundworker.aspx更多信息

        System.ComponentModel.BackgroundWorker bw;

        private void button4_Click(object sender, RoutedEventArgs e)

        {

            bw = new System.ComponentModel.BackgroundWorker();//创建BackgroundWorker对象实例

            bw.DoWork += new System.ComponentModel.DoWorkEventHandler(bw_DoWork);//订阅DoWork事件

            bw.ProgressChanged += new System.ComponentModel.ProgressChangedEventHandler(bw_ProgressChanged);//订阅报告进程事件

            bw.WorkerReportsProgress = true;

            bw.RunWorkerAsync();//开始执行后台操作

        }

        void bw_ProgressChanged(object sender, System.ComponentModel.ProgressChangedEventArgs e)

        {

            this.progressBar1.Value = e.ProgressPercentage;//获取进度百分比

            this.label2.Content = (e.ProgressPercentage.ToString() + "%");

        }

        void bw_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)

        {

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

            {

                this.bw.ReportProgress(i);

                System.Threading.Thread.Sleep();

            }

        }

        //方式5我们可以利用线程并行来处理

    }

}

类EX中的是一个扩展方法。进行界面刷新

 public static class Ex

    {

        //扩展方法进行界面刷新

        public static void DoEvents(this Window 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;

        }

    }

效果展示：