using System;

class Test{
   public static void Main(){
      new Test().F();
   }
   
   event EventHandler ev1;
   EventHandler ev2;
   
   void F(){
      ev1 += Handler1;
      ev1 += Handler2;
      ev1 += Handler3;
      try{ev1(null,null);}catch(Exception ex){Console.WriteLine("catch["+ex.Message+"]");}
      
      ev2 = chain(ev2, Handler1);
      ev2 = chain(ev2, Handler2);
      ev2 = chain(ev2, Handler3);
      try{ev2(null,null);}catch(Exception ex){Console.WriteLine("catch["+ex.Message+"]");}
   }
   
   static EventHandler chain(EventHandler a, EventHandler b){
      return (Object sender, EventArgs e) => {if(a!=null){a(sender, e);} if(b!=null){b(sender, e);}};
   }
   
   static void Handler1(Object sender, EventArgs e){
      Console.WriteLine("1");
   }
   static void Handler2(Object sender, EventArgs e){
      Console.WriteLine("2");
      throw new Exception("ex2");
   }
   static void Handler3(Object sender, EventArgs e){
      Console.WriteLine("3");
   }
}