C#索引器：在集合或数组中取出某一个元素 举例 _【转】

Garmmar：

[访问修饰符] 数据类型 this[参数列表]

{

get

{ 获取索引器的内容 }

set

{ 设置索引器的内容 }

}

Eg：

     <span style="font-size:14px;">using System;
     using System.Collections.Generic;
     using System.Text;  

     namespace IndexerUsing
     {
         class Photo
         {  

             private string name;  

             public string Name
             {
                 get { return name; }
                 set { name = value; }
             }
             public Photo() { }
             public Photo(string name)
             {
                 this.name = name;
             }
         }
         class Album
         {
             private Photo[] _photos;
             public Album()
             { }
             public Album(int count)
             {
                 _photos = new Photo[count];
             }
             public Photo this[int index]
             {
                 get
                 {
                     if (index <  || index > _photos.Length)
                         return null;
                     else
                         return _photos[index];
                 }
                 set
                 {
                     if (index <  || index > _photos.Length)
                         return;
                     else
                         _photos[index] = value;
                 }
             }
         }  

         class Program
         {
             static void Main(string[] args)
             {
                 Album album = new Album();
                 Photo photo1 = new Photo("王云鹏");
                 Photo photo2 = new Photo("黄利云");
                 Photo photo3 = new Photo("李文平");
                 album[] = photo1;
                 album[] = photo2;
                 album[] = photo3;
                 Console.WriteLine("输入第一张照片:{0}", album[].Name);  

             }
         }
     }
     </span>