实例构造函数

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace 实例构造函数{    class Program    {        static void Main(string[] args)        {            Class1 a = new Class1();//调用1            Class1 b = new Class1(2);//调用2            Class1 c = new Class1("liming");//调用3            a.Say();            b.Say();            c.Say();            Console.ReadKey();        }    }    class Class1     {        int id;        string name;        public Class1() { id = 20; name = "mm"; }//实构1        public Class1(int var) { id = var; name = "mm"; }//实构2        public Class1(string names) { id = 20; name = names; }//实构3        public void Say() { Console.WriteLine("Name={0},id={1}",name,id); }    }}