通過一個例子來看
-------------------------------------------------------Student.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Collections;
namespace ConsoleApplication6
{
public class Student:IEnumerable
{
//數組
public string[] s;
//索引器
public int i;
public Student(string[] str)//構造函數,初始化數組
{
s = str;
}
public IEnumerator GetEnumerator()//疊代器
{
return s.GetEnumerator();
}
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Collections;
namespace ConsoleApplication6
{
public class StiAll:IEnumerator
{
//student對象
Student s;
//遊标
int i = -1;
public StiAll(Student ss)//構造函數,初始化student對象
{
this.s = ss;
}
public object Current//擷取目前的項(隻讀屬性)
{
get { return s.s[i]; }
}
public bool MoveNext()//将遊标的位置向前移動
{
if (i<s.s.Length-1)//如果在s數組的長度範圍之内就傳回true
{
i++;
return true;
}
else
{
return false;
}
}
public void Reset()//初始化遊标
{
i = -1;
}
}
}
Student s = new Student(new string[] { "呂蒙", "周泰", "黃蓋" });//執行個體化Student對象
//第一種方式周遊
foreach (var item in s)
{
Console.WriteLine(item);//輸出呂蒙,周泰,黃蓋
}
//第二種方式周遊
StiAll sa = new StiAll(s);
while (sa.MoveNext())
{
Console.WriteLine(sa.Current);//輸出呂蒙,周泰,黃蓋
}
Console.ReadKey();