练习题一：

使用学到的文件操作，创建三个文件文件名分别是数学.txt，语文.txt,英语.txt,里面分别存放着50个学生的数学，语文，英语成绩，每一行放着名字和对应的分数，名字是小明1，小明2这样的规律显示，分数随机，每一行显示的完整内容是科目+名字+分数，接下来用我们前面讲到的正则表达式，找出所有txt文件中的小明1的成绩逐行显示到1.txt文件中



            StreamWriter fsWriter1 = new StreamWriter("./语文.txt",true);
            StreamWriter fsWriter2 = new StreamWriter("./数学.txt",true);
            StreamWriter fsWriter3 = new StreamWriter("./英语.txt",true);


            for (int i = 0; i < 50; i++)
            {
               Random random = new Random();
                int a = random.Next(100);
                fsWriter1.WriteLine("语文" + "+" + "小明" + i + "+" + a);
                fsWriter2.WriteLine("数学" + "+" + "小明" + i + "+" + a);
                fsWriter3.WriteLine("英语" + "+" + "小明" + i + "+" + a);
            }
            fsWriter1.Close();
            fsWriter2.Close();
            fsWriter3.Close();

            StreamReader sRead1 = new StreamReader("./语文.txt", Encoding.UTF8);
            StreamReader sRead2 = new StreamReader("./数学.txt", Encoding.UTF8);
            StreamReader sRead3 = new StreamReader("./英语.txt", Encoding.UTF8);

            string patten = @".\+小明1\+.";

            StreamReader[] sRead = { sRead1, sRead2, sRead3 };
            foreach (StreamReader i in sRead)
            {
                StreamWriter fsWriter4 = new StreamWriter("./1.txt", true);
                string str1 = i.ReadToEnd();
            string[] sArray = str1.Split("\n");
            foreach (string s in sArray)
            {
                if (Regex.IsMatch(s,patten))
                {
                    fsWriter4.WriteLine(s);
                }
                
            }
                fsWriter4.Close();

            }

练习题二：

请利用面向对象分析实现图书管理系统，具有录入，查询，删除，显示所有图书信息功能。借助文件操作的方式存储数据，将书籍存放到图书文件夹下，每本书都是一个txt文件，文件名为该书的名字，书中的初始内容为书名，图书的数据有书名，作者，价格，删除的时候要输入书的名字来进行删除

using System.Text;

namespace vrDemo0205am1
{
    internal class Program
    {
        internal class Book
        {



/*            public Book()
            {
                StreamWriter fsWriter = new StreamWriter("./图书管理系统/" + Book.name + ".txt", true);
                fsWriter.Write(Book.name);
                fsWriter.Close();
                Book.name = name;
            }*/
            public  string name { get; set; }
            public string author { get; set; }
            public int price { get; set; }

            public void Insert(string name,string author=" ",string price=" ")
            {
                string system = "./图书管理系统/" + name + ".txt";
                StreamWriter fsWriter = new StreamWriter(system, true);
              //  StreamWriter fsWriter2 = new StreamWriter("./图书管理系统/abc.txt", true);
                fsWriter.WriteLine(name);
                fsWriter.WriteLine(author);
                fsWriter.WriteLine(price);
             //   fsWriter2.WriteLine(name+author+price);
                fsWriter.Close();
              //  fsWriter2.Close();
            }

            public void Select(string name)
            {
                StreamReader sRead = new StreamReader("./图书管理系统/"+name+".txt", Encoding.UTF8);
                string s = sRead.ReadToEnd();
                sRead.Close();
                Console.WriteLine(s);
            }
            
            public void Delete(string name)
            {
                if (File.Exists("./图书管理系统/" + name + ".txt"))
                {
                 File.Delete("./图书管理系统/" + name + ".txt");
                Console.WriteLine("成功");
                }
                else
                {
                Console.WriteLine("失败,未查找到此图书");
                }
                
            }

        }
    

        


        static void Main(string[] args)
        {
            //请利用面向对象分析实现图书管理系统，具有录入，查询 ，删除，显示所有图书信息功能。
            //借助文件操作的方式存储数据，将书籍存放到图书文件夹下，每本书都是一个txt文件，
            //文件名为该书的名字，书中的初始内容为书名，图书的数据有书名，作者，价格，
            //删除的时候要输入书的名字来进行删除
            while (true)
            {
                string[] fileNames = Directory.GetFiles("./图书管理系统/");
/*                foreach (string file in fileNames)
                {
                    string ss = file;
                    Book  book = new Book(file);
                }  */
                 
                Console.WriteLine("录入1，查询2 ，删除3,显示所有图书信息4,任意字符退出");
                string s = Console.ReadLine();
                switch (s)
                {
                    case "1":
                        Console.WriteLine("请输入书名");
                        string name = Console.ReadLine();
                        Book book = new Book();
                        Console.WriteLine("插入作者名和价格1，退出任意字符");
                        string s1 = Console.ReadLine();
                        if (s1=="1")
                        {
                            Console.WriteLine("输入作者名");
                            string author = Console.ReadLine();
                            Console.WriteLine("输入价格");
                            string price = Console.ReadLine();
                            book.Insert(name, author, price);
                        }
                        break;
                    case "2":
                        Console.WriteLine("请输入书名");
                        string name1 = Console.ReadLine();
                       Book book2 = new Book();
                        book2.Select(name1);
                      //  Manage manage = new Manage();
                    //    manage.Insert(name1)
                        break;
                    case "3":
                        Console.WriteLine("请输入书名");
                        string name2 = Console.ReadLine();
                        Book book3 = new Book();
                        book3.Delete(name2);
                        break;
                    case "4":
                        foreach (string file in fileNames)
                        {
                            Console.WriteLine(file);
                        }
                        break;

                    default:
                        break;
                }


            }

        }


    
    }
}

VR引擎开发0205

练习题一：

练习题二：