C#如何進行多線程編程

由于多線程編程非常復(fù)雜，這個小例子只能算是一個入門線的知識點吧

首先建一個應(yīng)用程序項目，命名為ThreadExample，在窗體上放一個文本框(textBox1) ，一個標(biāo)簽(lblResult)，再放兩個按鈕，分別命名為btnStart、btnStop。

窗體代碼：

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 = "啟動";
            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 = "關(guān)閉";
            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;
    }
}

程序代碼：

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
    {
        //聲明一個線程
        private Thread timerThread;
        //聲明一個變量,用來存儲label值
        int count, i = 0;

        public ThreadExample()
        {
            InitializeComponent();
        }

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

        //更新線程
        public void UpdataThread()
        {
            try
            {
                //在對控件的調(diào)用方法進行調(diào)用時,或需要一個簡單委托又不想自己定義時可以使用該委托。
                MethodInvoker mi = new MethodInvoker(this.AddData);
                while (true)
                {
                    //在創(chuàng)建控件的基礎(chǔ)句柄所在線程上異步執(zhí)行指定的委托
                    this.BeginInvoke(mi);
                    Thread.Sleep(50);
                }
            }
            catch (ThreadInterruptedException)
            {
                //針對具體問題定制異常拋出顯示
            }
            finally
            {
                //做一些處理
            }
        }

        //啟動線程
        public void StartThread()
        {
            StopThread();
            timerThread = new Thread(new ThreadStart(UpdataThread));
            //獲取或設(shè)置一個值，該值指示某個線程是否為后臺線程。
            timerThread.IsBackground = true;
            timerThread.Start();
        }

        //停止線程
        public void StopThread()
        {
            if (timerThread != null)
            {
                //中斷線程
                timerThread.Interrupt();
                timerThread = null;
            }
        }

        //啟動線程,顯示結(jié)果
        private void btnStart_Click(object sender, EventArgs e)
        {
            //調(diào)用線程啟動函數(shù)
            count = int.Parse(textBox1.Text);
            this.StartThread();
        }

        //停止線程
        private void btnStop_Click(object sender, EventArgs e)
        {
            //調(diào)用線程停止函數(shù)
            this.StopThread();
        }
    }
}

編譯后，運行，在文本框中輸入200，點擊開始按鈕，標(biāo)簽為動態(tài)增長，點擊停止可以暫停程序的執(zhí)行。

posted @ 2009-06-23 10:39 .NET快速開發(fā)框架閱讀(352) 評論(0) 收藏舉報

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C#如何進行多線程編程