C#将类实现集合

using  System;
using  System.Collections;

/**/ /// <summary>
/// 实现集合的类Name
/// </summary>
public   class  Name : IEnumerable
... {
      private int _size;
private    string[] _names;

      public Name(int size)
...{
          _size = size;
          _names = new string[_size];
}
      public Name() ...{ }

      public int Length 
      ...{
          get ...{ return _size; }
          set 
          ...{
              _size = value;
              _names = new string[_size];
          }
      }

      public string this[int index]
      ...{
          get
          ...{
              if (index < 0 || index >= _size)
              ...{
                  throw new InvalidOperationException("下标越界！");
              }
              else
              ...{
                  return _names[index];
              }
          }
          set
          ...{ 
               if (index < 0 || index >= _size)
              ...{
                  throw new InvalidOperationException("下标越界！");
              }
              else
              ...{
                  _names[index]=value;
              }
          }
      }

      public IEnumerator GetEnumerator()
      ...{
          return new NameEnumerator(this,_size);
      }

      private class NameEnumerator : IEnumerator
      ...{
          Name myName;
          int location;
          int _size;

          public NameEnumerator(Name theName,int size)
          ...{
              _size = size;
              this.myName = theName;
              location = -1;
          }

          public bool MoveNext()
          ...{
              location++;
              return (location >= _size) ? false : true;
          }

          public object Current
          ...{
              get
              ...{
                  if (location < 0 || location >= _size )
                  ...{
                      throw new InvalidOperationException("越界错误！");
                  }
                  else
                  ...{
                      return myName[(int)location];
                  }
              }
          }

          public void Reset()
          ...{
              location = -1;
          }
    
      }
}

 

-------------------------------------------------------------------------------------------------------------------------

测试：        

Name myName = new Name(3);
myName[0] = "Pzh";
myName[1] = "Youniao";
myName[2] = "Godling";

foreach (string name in myName)
{
      Response.Write("我的名字："+name+"<br />");
}

-------------------------------------------------------------------------------------------------------------------------

输出：

我的名字：Pzh
我的名字：Youniao
我的名字：Godling

给类加了属性Length 可以改变‘容量’，不过数组被重新初始化了，付值前的字符串会丢失，这里随便写个属性表示这么个意思，如果要实现数组列表ArrayList的功能有兴趣的再改进