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通過(guò)一個(gè)例子來(lái)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(shù)組 public string[] s; //索引器 public int i; public Student(string[] str)//構(gòu)造函數(shù),初始化數(shù)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(duì)象 Student s; //游標(biāo) int i = -1; public StiAll(Student ss)//構(gòu)造函數(shù),初始化student對(duì)象 { this.s = ss; } public object Current//獲取當(dāng)前的項(xiàng)(只讀屬性) { get { return s.s[i]; } } public bool MoveNext()//將游標(biāo)的位置向前移動(dòng) { if (i<s.s.Length-1)//如果在s數(shù)組的長(zhǎng)度范圍之內(nèi)就返回true { i++; return true; } else { return false; } } public void Reset()//初始化游標(biāo) { i = -1; } } }
-------------------------------------------------------主程序
Student s = new Student(new string[] { "呂蒙", "周泰", "黃蓋" });//實(shí)例化Student對(duì)象 //第一種方式遍歷 foreach (var item in s) { Console.WriteLine(item);//輸出呂蒙,周泰,黃蓋 } //第二種方式遍歷 StiAll sa = new StiAll(s); while (sa.MoveNext()) { Console.WriteLine(sa.Current);//輸出呂蒙,周泰,黃蓋 } Console.ReadKey();
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