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。