static void Main(string[] args)
{

   Worker.TwoNumberHandleMethodDelegate method = delegate(int a, int b)
  {
   return a + b;
  };
   Worker worker = new Worker();
   int result = worker.HandleTwoNumber(10, 10,method);

   Console.WriteLine(String.Format("Result:{0}", result));

   Console.ReadLine();
}

 static void Main(string[] args)
  {
   Worker worker = new Worker();
   int result = worker.HandleTwoNumber(10, 10, delegate (int a, int b)
   {
    return a + b;
   });

   Console.WriteLine(String.Format("Result:{0}", result));

   Console.ReadLine();
  }

static void Main(string[] args)
  {

   Worker.TwoNumberHandleMethodDelegate method = delegate(int a, int b)
  {
   return a + b;
  };
}

static void Main(string[] args)
  {

   Worker.TwoNumberHandleMethodDelegate method = (a, b)=>
  {
   return a + b;
  };
}

 static void Main(string[] args)
  {
   Worker worker = new Worker();
   int result = worker.HandleTwoNumber(10, 10, (a, b) =>
   {
    return a + b;
   });

   Console.WriteLine(String.Format("Result:{0}", result));

   Console.ReadLine();
  }

private void A1()
    {
      Console.WriteLine("....");
    }
//Lambda
()=>{Console.WriteLine("....");};
//如果方法体代码只有一句，如上还可省去方法体大括号
()=>Console.WriteLine("....");

private string A2(int a, int b)
    {
      return String.Format("{0}+{1}={2}", a, b, a + b);
    }
    //如上示例可简化为
    (a,b)=>{return String.Format("{0}+{1}={2}", a, b, a + b);}
    //因为方法体只有一句，可进一步简化
    (a,b)=> String.Format("{0}+{1}={2}", a, b, a + b);
    //此时注意return应该去掉，C#编译器自动识别=>做返回值

private string A3(int a)
    {
      return String.Format("{0}", a);
    }
    //上面示例可简化为
    (a)=>String.Format("{0}", a);
    //如果参数列表只有一个参数，参数列表的()可以去掉，上面进一步简化为
    a=>String.Format("{0}", a);