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 < 0 || index > _photos.Length)  
                        return null;  
                    else  
                        return _photos[index];  
                }  
                set  
                {  
                    if (index < 0 || index > _photos.Length)  
                        return;  
                    else  
                        _photos[index] = value;  
                }  
            }  
        }  
      
        class Program  
        {  
            static void Main(string[] args)  
            {  
                Album album = new Album(3);  
                Photo photo1 = new Photo("王云鹏");  
                Photo photo2 = new Photo("黄利云");  
                Photo photo3 = new Photo("李文平");  
                album[0] = photo1;  
                album[1] = photo2;  
                album[2] = photo3;  
                Console.WriteLine("输入第一张照片:{0}", album[0].Name);  
      
            }  
        }  
    }  
    </span>