C#的foreach循环替换for循环

C#的foreach循环替换for循环

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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Collections;   namespace Test1111 {     class Program     {         static void Main(string[] args)         {             ArrayList studentList = new ArrayList();             studentList.Add("a");             studentList.Add("b");             studentList.Add("c");             studentList.Add("d");             studentList.Add("e");             studentList.AddRange(new int[]{6,7,8,9});             studentList.Add("ssss");             Console.WriteLine("集合元素为：");             //for (int i = 0; i<studentList.Count;i++ )             //{             //    Console.Write(studentList[i]);             //}               foreach (object x in studentList)             {                 Console.Write("{0} ", x);             }               Console.WriteLine();                 studentList.Remove("e");             studentList.RemoveAt(1);             studentList.RemoveRange(4,2);             Console.WriteLine("集合元素为：");             //for (int i = 0; i < studentList.Count; i++)             //{             //    Console.Write(studentList[i]);             //}                 foreach (object x in studentList)             {                 Console.Write("{0} ", x);             }             Console.WriteLine();                 studentList.Insert(1,"fff");             studentList.InsertRange(0,new string[]{"张三","李四"});             Console.WriteLine("集合元素为：");             //for (int i = 0; i < studentList.Count; i++)             //{             //    Console.Write(studentList[i]);             //}             foreach (object x in studentList)             {                 Console.Write("{0} ", x);             }             Console.WriteLine();               studentList.Add("王五");             if (!studentList.Contains("王五"))             {                 studentList.Add("王五");             }             else {                 Console.WriteLine("集合中已经有王五了！");             }               //for (int i = 0; i<studentList.Count;i++ )             //{             //    Console.Write(studentList[i]);             //}               foreach (object x in studentList)             {                 Console.Write("{0} ", x);             }                 Console.ReadLine();         }     } }