C#如何进行多线程编程

C#如何进行多线程编程

由于多线程编程非常复杂，这个小例子只能算是一个入门线的知识点吧

首先建一个应用程序项目，命名为ThreadExample，在窗体上放一个文本框(textBox1)，一个标签(lblResult)，再放两个按钮，分别命名为btnStart、btnStop。

窗体代码：

<!--<br><br>Code highlighting produced by Actipro CodeHighlighter (freeware)<br>http://www.CodeHighlighter.com/<br><br>--> namespace ThreadExample
{
partial class ThreadExample
{
/**/ /// <summary>
/// Requireddesignervariable.
/// </summary>
private System.ComponentModel.IContainercomponents = null ;

/**/ /// <summary>
/// Cleanupanyresourcesbeingused.
/// </summary>
/// <paramname="disposing"> trueifmanagedresourcesshouldbedisposed;otherwise,false. </param>
protected override void Dispose( bool disposing)
{
if (disposing && (components != null ))
{
components.Dispose();
}
base .Dispose(disposing);
}

WindowsFormDesignergeneratedcode #region WindowsFormDesignergeneratedcode

/**/ /// <summary>
/// RequiredmethodforDesignersupport-donotmodify
/// thecontentsofthismethodwiththecodeeditor.
/// </summary>
private void InitializeComponent()
{
this .btnStart = new System.Windows.Forms.Button();
this .btnStop = new System.Windows.Forms.Button();
this .button1 = new System.Windows.Forms.Button();
this .textBox1 = new System.Windows.Forms.TextBox();
this .lblResult = new System.Windows.Forms.Label();
this .SuspendLayout();
//
// btnStart
//
this .btnStart.Location = new System.Drawing.Point( 14 , 38 );
this .btnStart.Name = " btnStart " ;
this .btnStart.Size = new System.Drawing.Size( 75 , 23 );
this .btnStart.TabIndex = 0 ;
this .btnStart.Text = " 启动 " ;
this .btnStart.Click += new System.EventHandler( this .btnStart_Click);
//
// btnStop
//
this .btnStop.Location = new System.Drawing.Point( 14 , 68 );
this .btnStop.Name = " btnStop " ;
this .btnStop.Size = new System.Drawing.Size( 75 , 23 );
this .btnStop.TabIndex = 1 ;
this .btnStop.Text = " 停止 " ;
this .btnStop.Click += new System.EventHandler( this .btnStop_Click);
//
// button1
//
this .button1.Location = new System.Drawing.Point( 14 , 97 );
this .button1.Name = " button1 " ;
this .button1.Size = new System.Drawing.Size( 75 , 23 );
this .button1.TabIndex = 3 ;
this .button1.Text = " 关闭 " ;
this .button1.Click += new System.EventHandler( this .button1_Click);
//
// textBox1
//
this .textBox1.Location = new System.Drawing.Point( 14 , 11 );
this .textBox1.Name = " textBox1 " ;
this .textBox1.Size = new System.Drawing.Size( 75 , 21 );
this .textBox1.TabIndex = 4 ;
this .textBox1.Text = " 200 " ;
//
// lblResult
//
this .lblResult.AutoSize = true ;
this .lblResult.Location = new System.Drawing.Point( 12 , 139 );
this .lblResult.Name = " lblResult " ;
this .lblResult.Size = new System.Drawing.Size( 23 , 12 );
this .lblResult.TabIndex = 5 ;
this .lblResult.Text = " 0/0 " ;
//
// ThreadExample
//
this .AutoScaleDimensions = new System.Drawing.SizeF(6F,12F);
this .AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this .ClientSize = new System.Drawing.Size( 104 , 164 );
this .Controls.Add( this .lblResult);
this .Controls.Add( this .textBox1);
this .Controls.Add( this .button1);
this .Controls.Add( this .btnStop);
this .Controls.Add( this .btnStart);
this .Name = " ThreadExample " ;
this .Text = " Form1 " ;
this .ResumeLayout( false );
this .PerformLayout();

}

#endregion

private System.Windows.Forms.ButtonbtnStart;
private System.Windows.Forms.ButtonbtnStop;
private System.Windows.Forms.Buttonbutton1;
private System.Windows.Forms.TextBoxtextBox1;
private System.Windows.Forms.LabellblResult;
}
}

程序代码：

<!--<br><br>Code highlighting produced by Actipro CodeHighlighter (freeware)<br>http://www.CodeHighlighter.com/<br><br>--> using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;

namespace ThreadExample
{
public partial class ThreadExample:Form
{
// 声明一个线程
private ThreadtimerThread;
// 声明一个变量,用来存储label值
int count,i = 0 ;

public ThreadExample()
{
InitializeComponent();
}

// 把label的值加1;
public void AddData()
{
// 显示lable的值
if (i == count)
i = 0 ;
this .lblResult.Text = i.ToString() + " / " + count.ToString();
i ++ ;
}

// 更新线程
public void UpdataThread()
{
try
{
// 在对控件的调用方法进行调用时,或需要一个简单委托又不想自己定义时可以使用该委托。
MethodInvokermi = new MethodInvoker( this .AddData);
while ( true )
{
// 在创建控件的基础句柄所在线程上异步执行指定的委托
this .BeginInvoke(mi);
Thread.Sleep( 50 );
}
}
catch (ThreadInterruptedException)
{
// 针对具体问题定制异常抛出显示
}
finally
{
// 做一些处理
}
}

// 启动线程
public void StartThread()
{
StopThread();
timerThread = new Thread( new ThreadStart(UpdataThread));
// 获取或设置一个值，该值指示某个线程是否为后台线程。
timerThread.IsBackground = true ;
timerThread.Start();
}

// 停止线程
public void StopThread()
{
if (timerThread != null )
{
// 中断线程
timerThread.Interrupt();
timerThread = null ;
}
}

// 启动线程,显示结果
private void btnStart_Click( object sender,EventArgse)
{
// 调用线程启动函数
count = int .Parse(textBox1.Text);
this .StartThread();
}

// 停止线程
private void btnStop_Click( object sender,EventArgse)
{
// 调用线程停止函数
this .StopThread();
}
}
}

编译后，运行，在文本框中输入200，点击开始按钮，标签为动态增长，点击停止可以暫停程序的执行。