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BackgroundWorker是·net里用来执行多线程任务的控件，它允许编程者在一个单独的线程上执行一些操作。
在开发多线程程序时，有些时候仅仅只是想实现一个简单的多线程，并不需要写一大堆的委托、回调等等，那么BackgroundWorker便是最好的选择。
本Demo演示BackgroundWorker在WPF中的简单线程例子！
---------------------------------------------------------------------XAML代码-----------------------------------------------------------
<Window x:Class="LshBackgroundWorkerDemo.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="BackgroundWorkerDemo" Width="800" Height="270" Loaded="Window_Loaded">
<ScrollViewer VerticalScrollBarVisibility="Auto">
<StackPanel>
<WrapPanel>
<Button Name="btnStartThread" Content="启动线程" Click="btnStartThread_Click"/>
<Button Name="btnPauseThread" Content="暂停线程" Click="btnPauseThread_Click"/>
<Button Name="btnContinueThread" Content="恢复线程" Click="btnContinueThread_Click"/>
<Button Name="btnTerminationThread" Content="终止线程" Click="btnTerminationThread_Click"/>
</WrapPanel>
<WrapPanel HorizontalAlignment="Center">
<TextBlock Text="数量:" Style="{StaticResource txtBlockSyle}">
</TextBlock>
<TextBox Name="txtNum" Style="{StaticResource txtNum}"></TextBox>
</WrapPanel>
<GroupBox Header="线程状态显示" Margin="10">
<Grid>
<ProgressBar x:Name="progressBar" Height="50"/>
<WrapPanel HorizontalAlignment="Center">
<TextBlock Text=" 已加载:" Style="{StaticResource txtBlockSyle}" />
<TextBlock x:Name="txtBlockNum" Text="0%" Style="{StaticResource txtBlockSyle}"/>
</WrapPanel>
</Grid>
</GroupBox>
</StackPanel>
</ScrollViewer>
</Window>
---------------------------------------------------------------------Style代码-----------------------------------------------------------
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Style TargetType="Button">
<Setter Property="FontSize" Value="20"></Setter>
<Setter Property="Margin" Value="20" ></Setter>
<Setter Property="Padding" Value="10 5 10 5"></Setter>
<Setter Property="Width" Value="150"></Setter>
<Setter Property="Background" Value="Black"></Setter>
<Setter Property="FontWeight" Value="Bold"></Setter>
<Setter Property="Effect">
<Setter.Value>
<DropShadowEffect Color="{DynamicResource {x:Static SystemColors.DesktopColorKey}}"/>
</Setter.Value>
</Setter>
<Setter Property="Foreground">
<Setter.Value>
<LinearGradientBrush EndPoint="0.5,1" MappingMode="RelativeToBoundingBox" StartPoint="0.5,0">
<GradientStop Color="#FFEEF906" Offset="1"/>
<GradientStop Color="#FFDA9D86"/>
</LinearGradientBrush>
</Setter.Value>
</Setter>
</Style>
<Style TargetType="TextBox" x:Key="txtNum">
<Setter Property="Width" Value="150"></Setter>
<Setter Property="Height" Value="35"></Setter>
<Setter Property="Text" Value="10000"></Setter>
<Setter Property="FontSize" Value="20"></Setter>
</Style>
<Style TargetType="TextBlock" x:Key="txtBlockSyle">
<Setter Property="Width" Value="100"></Setter>
<Setter Property="Height" Value="40"></Setter>
<Setter Property="FontSize" Value="20"></Setter>
<Setter Property="Padding" Value="0 5 0 0"></Setter>
<Setter Property="Margin" Value="0 5 0 0"></Setter>
</Style>
</ResourceDictionary>
---------------------------------------------------------------------CS代码-----------------------------------------------------------
using System;
using System.Collections.Generic;
using System.ComponentModel;
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.Text.RegularExpressions;
using System.Threading;
namespace LshBackgroundWorkerDemo
{
/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window
{
#region 公共变量
//简单线程对象
private BackgroundWorker backgroundWorker;
//指定的操作数量
private int number;
//用该对象控制线程的暂停和继续
private ManualResetEvent manualReset = new ManualResetEvent(true);
#endregion
public MainWindow()
{
InitializeComponent();
}
/// <summary>
/// 启动线程单击事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnStartThread_Click(object sender, RoutedEventArgs e)
{
//验证用户输入是否正确
if (vili())
{
//初始化所有控件以及数据
int num = int.Parse(txtNum.Text);
number = num;
progressBar.Maximum = num;
progressBar.Minimum = 0;
//启动线程
backgroundWorker.RunWorkerAsync(num);
}
}
/// <summary>
/// 线程执行函数
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
{
for (int i = 0; i <= Convert.ToInt32(e.Argument); i++)
{
//判断用户是否已经取消该线程执行，如果没有则正常执行
if (!backgroundWorker.CancellationPending)
{
backgroundWorker.ReportProgress(i);
//等待消息通知，为true则不进行阻塞，false则进行阻塞暂停该线程执行
manualReset.WaitOne();
Thread.Sleep(1);
}
}
}
/// <summary>
/// 线程结束回调函数
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void backgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
global::System.Windows.MessageBox.Show("结束");
}
/// <summary>
/// 线程操作数被修改回调函数
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void backgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
double baifen = ((double)e.ProgressPercentage / (double)number) * 100;
txtBlockNum.Text = baifen + "%";
progressBar.Value = e.ProgressPercentage;
}
/// <summary>
/// 验证文本框
/// </summary>
private bool vili()
{
string inputTxt = this.txtNum.Text;
Regex gex = new Regex(@"^-?\d+\.?\d*$");
if (!gex.IsMatch(inputTxt))
{
global::System.Windows.MessageBox.Show("文本框内容必须是纯数字!");
return false;
}
return true;
}
/// <summary>
/// 暂停线程
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnPauseThread_Click(object sender, RoutedEventArgs e)
{
manualReset.Reset();
}
/// <summary>
/// 窗体加载完成时执行事件绑定
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Window_Loaded(object sender, RoutedEventArgs e)
{
backgroundWorker = new BackgroundWorker();
backgroundWorker.WorkerReportsProgress = true;
backgroundWorker.WorkerSupportsCancellation = true;
backgroundWorker.DoWork += new DoWorkEventHandler(backgroundWorker_DoWork);
backgroundWorker.ProgressChanged += new ProgressChangedEventHandler(backgroundWorker_ProgressChanged);
backgroundWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(backgroundWorker_RunWorkerCompleted);
}
/// <summary>
/// 恢复线程运行
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnContinueThread_Click(object sender, RoutedEventArgs e)
{
manualReset.Set();
}
/// <summary>
/// 结束线程
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnTerminationThread_Click(object sender, RoutedEventArgs e)
{
backgroundWorker.CancelAsync();
this.Dispatcher.Invoke(new Action(() =>
{
progressBar.Value = 0;
txtBlockNum.Text = "0%";
}));
}
}
}
|
Demo下载地址：http://yunpan.cn/cfWBaYYrd3wGu
提取码 7172  |
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原文地址：http://www.cnblogs.com/fuhua/p/5880250.html
