using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace nange_1{    class A    {        public int a=1;//这里和c++不一样的，c#可以再类里面给字段赋值；        public int b=2;        public A()        {                        Console.WriteLine("构造函数");        }        public A(int a,int b)        {            this.a = a; this.b = b;            Console.WriteLine("构造函数");        }    }   class Program    {        static void Main(string[] args)        {               A objA = new A();            Console.WriteLine(objA.a+" "+ objA.b);            A objB = new A { a = 3, b = 4 };//可以这样初始化对象            Console.WriteLine(objB.a + " " + objB.b);            A objC = new A(5, 6);            Console.WriteLine(objC.a + " " + objC.b);            Console.ReadLine();        }           }}
输出结果如下所示：