在C# 1.0中提出了一种新特性叫作：委托。委托本质上一种类型。是对特定方法的抽象，定义委托后，可以将方法封装，把方法当参数，传递

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 WindowsFormsTest
{
    public partial class Form1 : Form
    {

        delegate void mydelget(RichTextBox gg);
       

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            mydelget my = new mydelget(this.WriteTextBox1);
            if (checkBox1.Checked == true)
            {
                richTextBox1.Clear();
                richTextBox1.Refresh();
                //this.WriteTextBox1();
                my(richTextBox1);
                richTextBox1.Focus();
                richTextBox1.SelectAll();
            }
            if (checkBox2.Checked == true)
            {
                richTextBox2.Clear();
                richTextBox2.Refresh();
                //this.WriteTextBox2();
                my(richTextBox2);
                richTextBox2.Focus();
                richTextBox2.SelectAll();
            }
        }

        public void WriteTextBox1(RichTextBox rich)
        {
            string data = textBox1.Text;
            for (int i = 0; i < data.Length; i++)
            {
                rich.AppendText(data[i].ToString());
                //延时
                DateTime now = DateTime.Now;
                while (now.AddSeconds(1) > DateTime.Now)
                {                 
                }
            }
        }

        //public void WriteTextBox2()
        //{
        //    string data = textBox1.Text;
        //    for (int i = 0; i < data.Length; i++)
        //    {
        //        richTextBox2.AppendText(data[i].ToString());
        //        //延时
        //        DateTime now = DateTime.Now;
        //        while (now.AddSeconds(1) > DateTime.Now)
        //        {

        //        }
        //    }

        //}
    }
}

运行结果：

通过WinForm小程序，探讨了一下委托。学习、理解委托是学习多线程的基础