.net初学之索引器

1.语法

(可有可无)[访问修饰符]  数据类型  this[数据类型  标识符]

{

    get{}

    set{}

}

e.g:

class Program
    {
        static void Main(string[] args)
        {
            Indexer ind = new Indexer(5);
            ind[0] = new animal("猫科", " 豹子");
            ind[1] = new animal("猫科", " 豹子1");
            ind[2] = new animal("猫科", " 豹子2");
            ind[3] = new animal("猫科", " 豹子3");
            ind[4] = new animal("猫科", " 豹子4");
 
            for (int i = 0; i < 5; i++)
            {
                Console.WriteLine(ind[i].show());
            }
        }
    }
 
    public class animal
    {
        private string kemu;
        public string Kemu
        {
            get { return kemu; }
            set { kemu = value; }
        }
        private string name;
        public string Name
        {
            get { return name; }
            set { name = value; }
        }
        public animal() { }
        public animal(string _kemu, string _name)
        {
            this.Kemu = _kemu;
            this.Name = _name;
        }
        public string show()
        {
            return "名字" + Name + "科目是" + Kemu;
        }
    }
    public class Indexer
    {
        public animal[] ani;
        public Indexer(int count)
        {
            if (count < 0)
                Console.WriteLine("长度不合法");
            ani = new animal[count];
        }
 
        public animal this[int index]
        {
            get
            {
                if (index > ani.Length)
                    return null;
                return ani[index];
            }
            set { ani[index] = value; }
        }
    }