详解C#中通过委托来实现回调函数功能的方法

void sort( iterator start, iterator end );
void sort( iterator start, iterator end, StrictWeakOrdering cmp );

delegate double ProcessDelegate(double param1, double param2);

static double Multiply(double param1, double param2)
{
  return param1 * param2;
}

staitc double Divide(double param1, double param2)
{
  return param1 / param2;
}

if (input == "M")
  process = new ProcessDelegate(Multiply);
else
  process = new ProcessDelegate(Divide);

static void ExecuteFunction(ProcessDelegate process)
{
process(2.2, 3.3);
}

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; 
using System.Threading; 
 
namespace Stockes 
{ 
  public partial class CallBack : Form 
  { 
    public CallBack() 
    { 
      InitializeComponent(); 
      //初始化回调方法 
      writeBoxCallback1 = new WriteBoxCallback1(Write1); 
      writeBoxCallbacK2 = new WriteBoxCallback2(Write2); 
    } 
    //声明委托已实现回调机制 
    private delegate void WriteTextBox(char ch); 
    private WriteTextBox writeTextBox; 
     //Text1的回调 
    private delegate void WriteBoxCallback1(char ch); 
    private WriteBoxCallback1 writeBoxCallback1; 
    //Text2的回调 
    private delegate void WriteBoxCallback2(char ch); 
    private WriteBoxCallback2 writeBoxCallbacK2; 
    private void button1_Click(object sender, EventArgs e) 
    { 
      if (checkBox1.Checked) 
      { 
        groupBox4.Text = "正在运行。。。"; 
        groupBox4.Refresh(); 
        textBox1.Clear(); 
        textBox1.Refresh(); 
        Thread th1 = new Thread(new ThreadStart(dowrite1));//创建线程1 
        th1.Start();//启动线程1 
      } 
      if (checkBox2.Checked) 
      { 
        groupBox2.Refresh(); 
        groupBox5.Text = "正在运行。。。"; 
        groupBox5.Refresh(); 
        textBox2.Clear(); 
        textBox2.Refresh(); 
        Thread th2 = new Thread(new ThreadStart(dowrite2));//创建线程2 
        th2.Start();//启动线程2 
      } 
    } 
    //Text1使用回调语句 
    private void CallTex1(char ch) 
    { 
      textBox1.Invoke(writeBoxCallback1,ch); 
    } 
    //Text2使用回调语句 
    private void CallText2(char ch) 
    { 
      textBox2.Invoke(writeBoxCallbacK2,ch); 
    } 
    //使用委托 
    private void WriteTex(WriteTextBox write) 
    { 
      string str = textBox3.Text.Trim(); 
      for (int i = 0; i < str.Length; i++) 
      { 
        write(str[i]); 
        DateTime now = DateTime.Now; 
        while (now.AddSeconds(1) > DateTime.Now) { } 
      } 
    } 
    //Text1添加值 
    private void Write1(char ch) 
    { 
      textBox1.AppendText(ch+"\r"); 
    } 
    //Text2添加值 
    private void Write2(char ch) 
    { 
      textBox2.AppendText(ch+"\r"); 
    } 
    //线程1调用的方法 
    private void dowrite1() 
    { 
      if (checkBox1.Checked) 
      { 
        writeTextBox = new WriteTextBox(CallTex1); 
        WriteTex(writeTextBox); 
      } 
    } 
    //线程2调用的方法 
    private void dowrite2() 
    { 
      if (checkBox2.Checked) 
      { 
        writeTextBox = new WriteTextBox(CallText2); 
        WriteTex(writeTextBox); 
      } 
    } 
  } 
}