class Car
    {
        string carNumber="1001";
        string carType = "Car";
        public string GetCarNum(string num,string type)                    //创建方法
        {
            num = carNumber;                                //获取私有变量的值
            type = carType;                                    //获取私有变量的值
            return num;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Car myCar = new Car();                                //创建一个新对象
            string number="0";                                //初始化对象
            string type = String.Empty;                            //String.Empty初始化空字符串
            myCar.GetCarNum(number, type);                                 //改变字符串的值
            Console.WriteLine(number);                            //输出
            Console.WriteLine(type);
            Console.ReadKey();
        }
    }
    }
----------------------这个输出number是0，type是空字符。书上说“ref关键字来对多个对象进行更改”，下面是代码:
class Car
    {
        string carNumber="1001";                        //声明字符串变量
        string carType = "Car";                        //声明字符串变量
        public string GetCarNum(ref string num,ref string type)                 //使用ref关键字
        {
            num = carNumber;                        /获取私有变量的值
            type = carType;                            //获取私有变量的值
            return num;                            //返回字符串变量
        }
    }
    class Program
    {
        static void Main(string[] args)                    //程序的主入口方法
        {
            Car myCar = new Car();                        //创建一个新对象
            string number="0";                        //将number赋值为0
            string type = String.Empty;                    //将type赋值为空
            myCar.GetCarNum(ref number,ref type);                     //使用ref关键字
            Console.WriteLine(number);                    //输出字段
            Console.WriteLine(type);                        //输出字段
            Console.ReadKey();                        //等待用户按键
        }
    }
-------------这个输出是什么呢，ref关键字的作用（“ref关键字来对多个对象进行更改”）理解不了，哪位前辈帮忙解释下，我是初学者。

[ 本帖最后由 tianqy 于 2011-7-7 15:24 编辑 ]

20分啊，在线等呢，高手们进来解释哈吧

20分啊，在线等呢，高手们进来解释哈吧

哪有求高手

哦 谢谢