Lambda表达式

public delegate int DelegateMethod(int a, int b);//声明委托

public DelegateMethod method;//定义委托变量

method = new DelegateMethod(Add);//为委托对象关联方法

//定义方法
public int Add(int a, int b)
{
    return a + b;
}

//调用委托变量传递信息
int a = 10;
int b = 17;
method(a ,b);

完整代码如下：

namespace nimingDemo
{
    public delegate int DelegateMethod(int a, int b);
    class Program
    {
        static void Main(string[] args)
        {
            DelegateMethod  method = new DelegateMethod(Add);
            int nResult = method(12, 34);
            Console.WriteLine(nResult);
            Console.ReadLine();
        }
        public static int Add(int a, int b)
        {
            return a + b;
        }
    }
}

namespace nimingDemo
{
    public delegate int DelegateMethod(int a, int b);
    class Program
    {
        static void Main(string[] args)
        {
            //DelegateMethod  method = new DelegateMethod(Add);
            DelegateMethod method = delegate(int a, int b)
            {
                return a + b;
            };
            int nResult = method(12, 34);
            Console.WriteLine(nResult);
            Console.ReadLine();
        }
        //public static int Add(int a, int b)
        //{
        //    return a + b;
        //}
    }
}

如上所写，我们可以使用匿名方法来直接关联委托和方法，此方法无需再单独定义

//上面的代码可以进行简写
DelegateMethod method = (int a, int b)=>{return a + b;};
//继续简写参数为推断类型
DelegateMethod method = (a, b)=>{return a + b;};