c# Lambda表达式使用

        //Lambda运算符=>
        //Lambda运算符的左边是输入参数(如果有)
        //右边是表达式或语句块

        //无参数
        private void OnTest1()
        {
            Action cb1 = delegate () {
                Console.WriteLine("Hello");
            };
            cb1();

            Action cb2 = () => {
                Console.WriteLine("Hello");
            };
            cb2();
        }

        //有参数
        private void OnTest2()
        {
            Action<string> cb1 = delegate (string name) {
                Console.WriteLine(name);
            };
            cb1("小明");

            Action<string> cb2 = name => {
                Console.WriteLine(name);
            };
            cb2("小红");

            Action<int> cb3 = x => {
                int num = x * 3;
                Console.WriteLine(num);
            };
            cb3(2);
        }

        //有返回值
        public delegate int MyDelegate(int x,int y);//定义委托
        private void OnTest3()
        {
            //MyDelegate mydel = new MyDelegate(GetNum);
            MyDelegate mydel = GetNum;
            int n1 = mydel(2,3);
            Console.WriteLine(n1);//6

            mydel = (x, y) => {
                return x * y;
            };
            int n2 = mydel(5,6);
            Console.WriteLine(n2);//30
        }

        private int GetNum(int x,int y)
        {
            return x * y;
        }

        private void btnTest1_Click(object sender, RoutedEventArgs e)
        {
            //OnTest1();
            //OnTest2();
            OnTest3();
        }
    }