WPF中的几种处理线程的工作方式:
2015-06-05 17:20
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WPF多线程演示
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="350" Width="525" Background="BlanchedAlmond"> <Grid> <Label Content="UI多线程演示" FontSize="24" Height="49" Margin="139,28,205,0" Name="label1" VerticalAlignment="Top" /> <Button Content="DispatcherTimer" Height="37" Margin="103,73,129,0" Name="button1" VerticalAlignment="Top" Click="button1_Click" /> <Button Content="DispatcherThread" Height="35" 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="40" Margin="103,0,129,65" Name="button4" VerticalAlignment="Bottom" Click="button4_Click" /> <ProgressBar Height="35" Margin="64,0,103,24" Name="progressBar1" VerticalAlignment="Bottom" /> <Label Height="35" HorizontalAlignment="Right" Margin="0,252,22,0" Name="label2" VerticalAlignment="Top" Width="60" /> </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<=100) { 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(100); } // 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 = 0; i < 100; i++) { newDispatcher.Invoke(newAction, i); System.Threading.Thread.Sleep(100); 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(100); } 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 = 0; i <= 100; i++) { System.Threading.Thread t = new System.Threading.Thread(ts); System.Threading.Thread.Sleep(100); 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 = 0; i <= 100; i++) { this.bw.ReportProgress(i); System.Threading.Thread.Sleep(100); } } //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:
![](http://images.cnitblog.com/blog/303892/201308/04094912-2faa7653cbfb43a98aadb415acfc6db2.jpg)
demo下载:http://files.cnblogs.com/BABLOVE/WPF%E5%A4%9A%E7%BA%BF%E7%A8%8B%E6%BC%94%E7%A4%BA.rar
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