委托

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication21
{
    class Program
    {
        static void Main(string[] args)
        {
            //Class1 cdata = new Class1();
            //int c = cdata.jiafa(1,2);
            //Console.WriteLine(c);
            ////通过委托来调用
            ////接收对应条件的函数，然后可以用委托对象来替代函数执行函数操作。
            //mydele m =cdata.jiafa;
            //int s = m(3, 5);
            //Console.WriteLine(s);

            //mydele m1 = cdata.jianfa;
            //Console.WriteLine(m1(5,3));

            //多路委托：相当于一个集合再添加方法，删除方法，按照先后顺序执行方法，必须是同一种委托类型的变量
            //mydele a, b, c;//a,b,c必须是同一个委托类型
            //a = new Class1().jiafa;
            //b = new Class1().jianfa;
            //c = a + b;
            //Console.WriteLine(c(1,2));

            //匿名方法，泛型集合
            //临时指定一个委托，临时写方法
            //string s = "你好";
            //Func<string, string> bianliang = delegate(string p)
            //    {
            //        p = p + s;
            //        return p;
            //    };
            //Console.WriteLine(bianliang("张三"));

            //Class1 c = new Class1();
            //Class1 d = new Class1("很好");
            //lambda表达式:指向的意思
            Func<string, string,string> bianliang = (s1, s2) => s1 + "world" + s2;
           

            Console.ReadLine();
        }
    }
}

类库

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication21
{
    //委托：detegete是一个函数的容器
    public delegate int mydele(int a ,int b);
    class Class1
    {
       
        public int jiafa(int a ,int b)
        {
            return a + b;
        }
        public int jianfa(int a, int b)
        {
            return a - b;
        }
        //类的构造函数
        public Class1()
        {
            Console.WriteLine("这是类的构造函数");
        }
    }
}