C#1到C#4使用委托的几种方式

using System;namespace DelegateDemo{    class PRogram    {        private delegate int Cacu(string str);        static void Main(string[] args)        {            //1            Cacu cacu = new Cacu(CacuInstance);            Console.WriteLine(cacu("Hello,Wrold"));            //2            Cacu cacu1 = new Cacu(delegate(string str) { return str.Length; });            Console.WriteLine(cacu1("Hello,Wrold"));            //3            Cacu cacu2 = new Cacu((str) => { return str.Length; });            Console.WriteLine(cacu2("Hello,Wrold"));        }        static int CacuInstance(string str)        {            return str.Length;        }    }}