IEnumerable介面與IEnumerator介面

標籤：c# ienumerable與ienumerator   ienumerable   ienumerator   

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)//建構函式，初始化數組        {            s = str;        }        public IEnumerator GetEnumerator()//迭代器        {            return s.GetEnumerator();        }    }}

-------------------------------------------------------StiAll.cs

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;        //遊標        int i = -1;        public StiAll(Student ss)//建構函式，初始化student對象        {            this.s = ss;        }         public object Current//擷取當前的項（唯讀屬性）        {            get { return s.s[i]; }        }        public bool MoveNext()//將遊標的位置向前移動        {            if (i<s.s.Length-1)//如果在s數組的長度範圍之內就返回true            {                i++;                return true;            }            else            {                return false;            }        }        public void Reset()//初始化遊標        {            i = -1;        }    }}

-------------------------------------------------------主程式

 Student s = new Student(new string[] { "呂蒙", "周泰", "黃蓋" });//執行個體化Student對象            //第一種方式遍曆            foreach (var item in s)            {                Console.WriteLine(item);//輸出呂蒙，周泰，黃蓋            }            //第二種方式遍曆            StiAll sa = new StiAll(s);            while (sa.MoveNext())            {                Console.WriteLine(sa.Current);//輸出呂蒙，周泰，黃蓋            }            Console.ReadKey();

本文出自 “程式猿的家” 部落格，請務必保留此出處http://962410314.blog.51cto.com/7563109/1529891