委托多线程

public partial class Form1 : Form

    {

        /*

         * 界面上有一个button,和一个textbox，点击button1时，开始一个新线程，新线程中有一个方法，从0开始计数

         * 并累加，且将每一个新的数字显示到textbox1中去

         * */

        public Form1()

        {

            InitializeComponent();

        }

 

        public delegate void SetTextDelegate(int text);

 

        private void button1_Click(object sender, EventArgs e)

        {

            Thread th = new Thread(new ThreadStart(SetText));

            th.Start();

        }

        private void SetText()

        {

            for (int a=0;a<1000000;a++)

            {

                if (textBox1.InvokeRequired)

                {

                    textBox1.Invoke(new SetTextDelegate(SetTextDo), a);

                }

            }

        }

        public void SetTextDo(int i)

        {

            textBox1.Text = i.ToString();

        }

    }

 #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.SuspendLayout();

            // 

            // button1

            // 

            this.button1.Location = new System.Drawing.Point(13, 23);

            this.button1.Name = "button1";

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

            this.button1.TabIndex = 0;

            this.button1.Text = "button1";

            this.button1.UseVisualStyleBackColor = true;

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

            // 

            // textBox1

            // 

            this.textBox1.Location = new System.Drawing.Point(145, 23);

            this.textBox1.Name = "textBox1";

            this.textBox1.Size = new System.Drawing.Size(100, 21);

            this.textBox1.TabIndex = 1;

            // 

            // Form1

            // 

            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);

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

            this.ClientSize = new System.Drawing.Size(284, 262);

            this.Controls.Add(this.textBox1);

            this.Controls.Add(this.button1);

            this.Name = "Form1";

            this.Text = "Form1";

            this.ResumeLayout(false);

            this.PerformLayout();

 

        }