第三章集合

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using System;using System.Collections;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace day_03{    class Program    {        static void Main(string[] args)        {              ForeachTest();                       foreach (Book item in list)            {                item.BookAuthor = "yy";                if (item.BookAuthor.Equals("yy"))                {                    item.BookAuthor = "yyy";                    break;                }            }            Console.WriteLine("===================修改===============");            foreach (Book item in list)            {                Console.WriteLine(item.BookAuthor);            }        }        static ArrayList list = new ArrayList();        private static void ForeachTest()        {                        Book book1=new Book("yy","xx",50);            Book book2 = new Book("yyy", "xxx", 60);            Book book3 = new Book("yyyy", "xxxx", 70);            list.Add(book1);            list.Add(book2);            list.Add(book3);            foreach (Book item in list)            {                Book book = (Book)item;                Console.WriteLine(item.BookName);            }        }        private static void ListBeginOneDemo()        {            //集合分类：单列集合+双列集合            ArrayList list = new ArrayList();            //添加一个元素            list.Add("张");            list.Add("李");            list.Add("凤");            //遍历            foreach (string item in list)            {                Console.WriteLine(item);            }            //修改，将凤 改成 宋            for (int i = 0; i < list.Count; i++)            {                if (list[i].Equals("凤"))                {                    list[i] = "宋";                    break;                }            }            Console.WriteLine("修改后");            foreach (string item in list)            {                Console.WriteLine(item);            }            //按索引删除            Console.WriteLine("========================");            list.RemoveAt(0);            foreach (string item in list)            {                Console.WriteLine(item);            }            //释放一个人  凤            list.Remove("凤");            Console.WriteLine("==================释放后======");            foreach (string item in list)            {                Console.WriteLine(item);            }            //i just make a joke .释放 所有人            list.Clear();            Console.WriteLine("==================释放所有======");            foreach (string item in list)            {                Console.WriteLine(item);            }        }    }}     using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace day_03{    class Book    {        public string BookName { get; set; }        public string BookAuthor { get; set; }        public int BookPrice { get; set; }        public Book() { }        public Book(string bookname, string bookauthor, int bookprice)        {            this.BookName = bookname;            this.BookAuthor = bookauthor;            this.BookPrice = bookprice;        }    }}
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第三章 集合

第三章集合
