C#的事件

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;

namespace codeTest
{
class Program
{
static void Main(string[] args)
{
EventTest e = new EventTest(10);
e.eNumDelegate += new codeTest.EventTest.NumDelegate(e.Show);
e.eNumDelegate += (x) => { Console.WriteLine("匿名函数可以直接绑定！"); };
e.SetValue(20);

IEvent ie= new MyClass();
ie.myDelegate += new MyDelegate(show);
ie.Show();
ie.myEventHandler += new EventHandler(Show);
ie.myEventHandler(new object(), new EventArgs());
Console.ReadLine();
}

static void show()
{
Console.WriteLine("Show!!!");
}

static void Show(object sender, EventArgs e)
{
Console.WriteLine("Show EventHandler");
}
}

class EventTest
{
int value;
public delegate void NumDelegate(int num);
public event NumDelegate eNumDelegate;
public EventTest(int num)
{
SetValue(num);
}

public void OnNumChange(int num)
{
if (eNumDelegate != null)
{
eNumDelegate(num);
}
else
{
Console.WriteLine("Event is null");
}
}

public void SetValue(int n)
{
if (value != n)
{
value = n;
OnNumChange(n);
}
}

public void Show(int num)
{
Console.WriteLine(string.Format("Num is {0}", num));
}
}

public delegate void MyDelegate();

public interface IEvent
{
//微软推荐写法
EventHandler myEventHandler { get; set; }
event MyDelegate myDelegate;
void Show();
}

public class MyClass : IEvent
{
public EventHandler myEventHandler { get; set; }
public event MyDelegate myDelegate;
public void Show()
{
if (myDelegate != null)
myDelegate();
}
}
}