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：
namespace ThreadExample
{
partial class ThreadExample
{
/**//// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;

/**//// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}

Windows Form Designer generated code#region Windows Form Designer generated code

/**//// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </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.Button btnStart;
private System.Windows.Forms.Button btnStop;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.Label lblResult;
}
}
程序代码：
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 Thread timerThread;
//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。
MethodInvoker mi = 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, EventArgs e)
{
//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, EventArgs e)
{
//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。