程式碼示例：

public class Program {

//需要監控的欄位

private int myValue;

//屬性設定，此處呼叫了事件觸發函式

public int MyValue{

get { return myValue; }

set{

//如果變數改變則呼叫事件觸發函式

if (value!=myValue) {

WhenMyValueChange();

}

myValue = value;

}

}

//定義的委託

public delegate void MyValueChanged(object sender, EventArgs e);

//與委託相關聯的事件

public event MyValueChanged OnMyValueChanged;

//建構函式初始化初值並繫結一個事件處理函式

public Program(){

myValue = 0;

OnMyValueChanged += new MyValueChanged(afterMyValueChanged);

}

//事件處理函式，在這裡新增變數改變之後的操作

private void afterMyValueChanged(object sender, EventArgs e) {

//do something

}

//事件觸發函式

private void WhenMyValueChange(){

if (OnMyValueChanged != null) {

OnMyValueChanged(this, null);

}

}

}

可以將要監控的變數寫成一個類

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace WindowsFormsApplication7 {

class MyClass {

private int myValue;

public int MyValue{

get { return myValue; }

set {

if (value !=myValue ){

WhenMyValueChange();

}

myValue = value;

}

}

//定義的委託

public delegate void MyValueChanged(object sender, EventArgs e);

//與委託相關聯的事件

public event MyValueChanged OnMyValueChanged;

//事件觸發函式

private void WhenMyValueChange() {

if(OnMyValueChanged !=null ){

OnMyValueChanged(this, null);

}

}

}

}

該類應用的程式碼

namespace WindowsFormsApplication7{

public partial class Form1 : Form {

MyClass myclase;

public Form1(){

InitializeComponent();

myclase = new MyClass();

myclase.MyValue = 23;

myclase.OnMyValueChanged += myclase_OnMyValueChanged;

myclase.MyValue = 24;

}

void myclase_OnMyValueChanged(object sender, EventArgs e){

MessageBox.Show("gaibian");

}

private void Form1_Load(object sender, EventArgs e) {

}

}

}