C# 迭代器简析

来源：互联网发布：软件安全性测试 csdn 编辑：程序博客网时间：2024/06/05 15:56

迭代器（iterator）有时又称游标（cursor）是程序设计的软件设计模式，可在容器（container，例如链表或阵列）上遍访的接口，设计人员无需关心容器的内容。

简单迭代器的实现：

using System;using System.Collections;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading;using System.Threading.Tasks;namespace ConsoleApplication1{    class Program    {        static bool delay = true;        static void Main(string[] args)        {            var result = getResult();            Console.WriteLine("first writeline : ");            //for循环控制迭代           /* for (var i = result.Current; result.MoveNext(); )            {                i = result.Current;                Console.WriteLine("outside writeLine : {0}", i);            }*/            //手动控制迭代            var i = result.Current;            Console.WriteLine("outside writeLine : {0}", i);            result.MoveNext();            i = result.Current;            Console.WriteLine("outside writeLine : {0}", i);            result.MoveNext();            i = result.Current;            Console.WriteLine("outside writeLine : {0}", i);            result.MoveNext();            i = result.Current;            Console.WriteLine("outside writeLine : {0}", i);            result.MoveNext();            i = result.Current;            Console.WriteLine("outside writeLine : {0}", i);            result.MoveNext();            i = result.Current;            Console.WriteLine("outside writeLine : {0}", i);            result.MoveNext();            i = result.Current;            Console.WriteLine("outside writeLine : {0}", i);            result.MoveNext();            i = result.Current;            Console.WriteLine("outside writeLine : {0}", i);            result.MoveNext();            i = result.Current;            Console.WriteLine("outside writeLine : {0}", i);            Console.ReadLine();        }        static IEnumerator getResult()        {            //var arr = Array.CreateInstance(typeof(Program), 1);              var arr = new int[] { 1, 2, 3, 45, 23, 23, 4, 3213 };            foreach (var item in arr)            {                yield return item;                if (delay) Thread.Sleep(100);            }        }      }    }

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