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。