class Program
{
    static void Main(string[] args)
    {
      Example example = new Example();
      example.Go();
      Console.ReadKey();
    }
}
public class Example
{
    public delegate void DoSth(string str);
    internal void Go()
    {
      //声明一个委托变量，并把已知方法作为其构造函数的参数
      DoSth d = new DoSth(Print);
      string str = "Hello,World";
      //通过委托的静态方法Invoke触发委托
      d.Invoke(str);
    }
    void Print(string str)
    {
      Console.WriteLine(str);
    }
}

public class Example
{
    public delegate void DoSth(object sender, EventArgs e);
    internal void Go()
    {
      //声明一个委托变量，并把已知方法作为其构造函数的参数
      DoSth d = new DoSth(Print);
      object sender = 10;
      EventArgs e = new EventArgs();
      d(sender, e);
    }
    void Print(object sender, EventArgs e)
    {
      Console.WriteLine(sender);
    }
}

public class Example
{
    public delegate void DoSth(object sender, EventArgs e);
    public event DoSth myDoSth;
    internal void Go()
    {
      //声明一个委托变量，并把已知方法作为其构造函数的参数
      DoSth d = new DoSth(Print);
      object sender = 10;
      EventArgs e = new EventArgs();
      myDoSth += new DoSth(d);
      myDoSth(sender, e);
    }
    void Print(object sender, EventArgs e)
    {
      Console.WriteLine(sender);
    }
}

public class Example
{
    public delegate void DoSth(object sender, EventArgs e);
    public event DoSth myDoSth;
    internal void Go()
    {
      //声明一个委托变量，并把已知方法作为其构造函数的参数
      DoSth d = new DoSth(Print);
      DoSth d1 = new DoSth(Say);
      object sender = 10;
      EventArgs e = new EventArgs();
      //为事件注册多个委托
      myDoSth += new DoSth(d);
      myDoSth += new DoSth(d1);
      myDoSth(sender, e);
    }
    void Print(object sender, EventArgs e)
    {
      Console.WriteLine(sender);
    }
    void Say(object sender, EventArgs e)
    {
      Console.WriteLine(sender);
    }
}

public class Example
{
    public delegate void DoSth(object sender, EventArgs e);
    public event DoSth myDoSth;
    internal void Go()
    {
      object sender = 10;
      EventArgs e = new EventArgs();
      //为事件注册多个委托
      myDoSth += Print;
      myDoSth += Say;
      myDoSth(sender, e);
    }
    void Print(object sender, EventArgs e)
    {
      Console.WriteLine(sender);
    }
    void Say(object sender, EventArgs e)
    {
      Console.WriteLine(sender);
    }
}  
 

public delegate void EventHandler(object sender, System.EventArgs e);

public class Example
{
    public event EventHandler myEvent;
    internal void Go()
    {
      object sender = 10;
      EventArgs e = new EventArgs();
      //为事件注册多个委托
      myEvent += Print;
      myEvent += Say;
      myEvent(sender, e);
    }
    void Print(object sender, EventArgs e)
    {
      Console.WriteLine(sender);
    }
    void Say(object sender, EventArgs e)
    {
      Console.WriteLine(sender);
    }
}