using System;

namespace LinQAndDeleGate
{
    class Program
    {
        static void Main(string[] args)
        {
            MyDel del1 = new MyDel(M1);
            del1 += M1;
            del1.Invoke();
            Action action = new Action(M1); //.net 4.0自带无返回值委托实例
            action();
            var action2 = new Action<string>(SayHi);//无返回值但是需要一个参数的委托实例(自带) var
            action2("ZhangSan");
            MyDelee<int> myadd = new MyDelee<int>(Add);//泛型委托实例
            var res = myadd(100, 200);
            Console.WriteLine(res);
            var func = new Func<double, double, double>(Mul);
            var res1 = func(3, 5);
            Console.WriteLine(res1);
        }
        static void M1()
        {
            Console.WriteLine("M1 is Here!");
        }
        static void SayHi(string name)
        {
            Console.WriteLine($"{name},Hi!");
        }
        static double Mul(double a,double b)
        {
            return a * b;
        }
        static int Add(int a,int b)
        {
            return a + b;
        }
    }

    delegate void MyDel();
    delegate T MyDelee<T>(T a, T b);//泛型委托,自.net4.0开始,无返回值的委托可直接用Action,有返回值直接用Func

}