C# 委托异步

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

 

namespace WindowsFormsApplication1

{

    public partial class Form1 : Form

    {

 

        #region 窗体设计器代码

        /// <summary>

        /// 必需的设计器变量。

        /// </summary>

        private System.ComponentModel.IContainer components = null;

 

        /// <summary>

        /// 清理所有正在使用的资源。

        /// </summary>

        /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>

        protected override void Dispose(bool disposing)

        {

            if (disposing && (components != null))

            {

                components.Dispose();

            }

            base.Dispose(disposing);

        }

 

        #region Windows 窗体设计器生成的代码

 

        /// <summary>

        /// 设计器支持所需的方法 - 不要

        /// 使用代码编辑器修改此方法的内容。

        /// </summary>

        private void InitializeComponent()

        {

            this.button1 = new System.Windows.Forms.Button();

            this.textBox1 = new System.Windows.Forms.TextBox();

            this.label1 = new System.Windows.Forms.Label();

            this.textBox2 = new System.Windows.Forms.TextBox();

            this.button2 = new System.Windows.Forms.Button();

            this.SuspendLayout();

            // 

            // button1

            // 

            this.button1.Location = new System.Drawing.Point(58, 119);

            this.button1.Name = "button1";

            this.button1.Size = new System.Drawing.Size(75, 23);

            this.button1.TabIndex = 0;

            this.button1.Text = "start";

            this.button1.UseVisualStyleBackColor = true;

            this.button1.Click += new System.EventHandler(this.button1_Click);

            // 

            // textBox1

            // 

            this.textBox1.Location = new System.Drawing.Point(128, 63);

            this.textBox1.Name = "textBox1";

            this.textBox1.Size = new System.Drawing.Size(100, 20);

            this.textBox1.TabIndex = 1;

            // 

            // label1

            // 

            this.label1.AutoSize = true;

            this.label1.Location = new System.Drawing.Point(55, 66);

            this.label1.Name = "label1";

            this.label1.Size = new System.Drawing.Size(67, 13);

            this.label1.TabIndex = 2;

            this.label1.Text = "线程做加法";

            // 

            // textBox2

            // 

            this.textBox2.Location = new System.Drawing.Point(287, 63);

            this.textBox2.Name = "textBox2";

            this.textBox2.Size = new System.Drawing.Size(100, 20);

            this.textBox2.TabIndex = 3;

            // 

            // button2

            // 

            this.button2.Location = new System.Drawing.Point(157, 119);

            this.button2.Name = "button2";

            this.button2.Size = new System.Drawing.Size(240, 23);

            this.button2.TabIndex = 4;

            this.button2.Text = "执行start按钮期间,点击我弹Message";

            this.button2.UseVisualStyleBackColor = true;

            this.button2.Click += new System.EventHandler(this.button2_Click);

            // 

            // Form1

            // 

            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);

            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

            this.ClientSize = new System.Drawing.Size(437, 249);

            this.Controls.Add(this.button2);

            this.Controls.Add(this.textBox2);

            this.Controls.Add(this.label1);

            this.Controls.Add(this.textBox1);

            this.Controls.Add(this.button1);

            this.Name = "Form1";

            this.Text = "Form1";

            this.ResumeLayout(false);

            this.PerformLayout();

 

        }

 

        #endregion

 

        private System.Windows.Forms.Button button1;

        private System.Windows.Forms.TextBox textBox1;

        private System.Windows.Forms.Label label1;

        private System.Windows.Forms.TextBox textBox2;

        private System.Windows.Forms.Button button2;

        #endregion

 

        public Form1()

        {

            InitializeComponent();

        }

        

        private void button1_Click(object sender, EventArgs e)

        {

            int startInt =10;//从10开始加起

            ProcessMethod = new Btn_ProcessMethod(CallFun);

            ProcessMethod.BeginInvoke(startInt,new AsyncCallback(CallBackFun),null);

        }

        /// <summary>

        /// 委托调用的方法（主要是做一件事情;把textBox1中的数字加1加5次，返回事情已经做完的结果状态）

        /// </summary>

        /// <param name="sign"></param>

        /// <returns></returns>

        private bool CallFun(int sign)

        {

            int ReturnInt = 0;//返回加1的次数

            while (ReturnInt < 5)//加5次

            {

                sign++;

                if (this.InvokeRequired)//如果不是当前UI线程则返回true

                {

                    this.Invoke(new delegateAddDisplay(AddDisplay), sign);

                }

                else

                {

                    AddDisplay(sign);

                }

                ReturnInt++;

                System.Threading.Thread.Sleep(2000);//两秒加一次

            }

            return true;

        }

        delegate void delegateAddDisplay(int sign);//显示textBox1信息委托

        delegate void delegateEndDisplay(string str);//显示textBox2信息委托

        private void AddDisplay(int sign)

        {

            this.textBox1.Text = sign.ToString();

        }

        private void EndDisplay(string str)

        {

            this.textBox2.Text = str; 

        }

        /// <summary>

        /// 异步回调方法

        /// </summary>

        /// <param name="IAresult"></param>

        /// <returns></returns>

        public void CallBackFun(IAsyncResult IAresult)

        {

            bool ReturnBool = ProcessMethod.EndInvoke(IAresult);//得到CallFun方法的返回值

            if (ReturnBool)//CallFun方法返回True，说明CallFun方法已经执行完毕

            {

                if (this.InvokeRequired)//如果不是当前UI线程则返回true

                {

                    //因为textBox2是UI线程创建的控件，所以要判断当前是不是创建此控件的UI线程

                    //（不然，就出现你所说的错误：“ 线程间操作无效:从不是创建控件 的线程访问它”）

                    this.Invoke(new delegateEndDisplay(EndDisplay), "事情已经做完");

                }

                else

                {

                    EndDisplay("事情已经做完");

                }

            }

        }

        delegate bool Btn_ProcessMethod(int sign);//UI以外线程代理

        Btn_ProcessMethod ProcessMethod;//UI以外线程代理申明 

 

        private void button2_Click(object sender, EventArgs e)

        {

            MessageBox.Show("你执行你的加法运算，我弹我的框，哈哈");

        }

    }

}