向指定txt文件里添加、读取和删除信息实例

using System;using System.IO;struct Record{public string name;public UInt16 age;public string phone;public string address;};//通讯录的记录格式class PhoneBook{FileStream f_srm;string s_filename;Record m_record;public PhoneBook(string filename){s_filename=filename;}public int Open(){//显示初始化界面Console.WriteLine("1:List Record");Console.WriteLine("2:Add New Record");Console.WriteLine("3:Erase Record");Console.WriteLine("0:Exit");Console.WriteLine("Please input the number you chose:");int i=Convert.ToInt32(Console.ReadLine());return i;}public void AddNew(){//向通讯录中添加记录try{f_srm=new FileStream(s_filename,FileMode.OpenOrCreate);}catch{Console.WriteLine("PhoneBook Error!");return;}BinaryWriter pw=new BinaryWriter(f_srm);pw.Seek(0,SeekOrigin.End);string s_temp;Console.Write("Name:");m_record.name=Console.ReadLine();pw.Write(m_record.name);reenter:Console.Write("Age:");s_temp=Console.ReadLine();try{m_record.age=Convert.ToUInt16(s_temp);}catch{Console.WriteLine("The format of age is error,please ReEnter");goto reenter;}pw.Write(m_record.age);Console.Write("Phone Number:");m_record.phone=Console.ReadLine();pw.Write(m_record.phone);Console.Write("Address:");m_record.address=Console.ReadLine();pw.Write(m_record.address);Console.WriteLine("Add Sucessfull");f_srm.Close();}public void List(){//浏览所有记录try{f_srm=new FileStream(s_filename,FileMode.Open);}catch{Console.WriteLine("PhoneBook Error!");return;}BinaryReader pr=new BinaryReader(f_srm);Console.WriteLine("Name Age Phone Number Address");Console.WriteLine("************************************************");while(true){if(f_srm.Length==0)//判断文件是否为空{Console.WriteLine("The phonebook is empty!");break;}try{m_record.name=pr.ReadString();m_record.age=pr.ReadUInt16();m_record.phone=pr.ReadString();m_record.address=pr.ReadString();}catch{return;}Console.WriteLine("{0,-9}{1,-6}{2,-18}{3}",m_record.name,m_record.age,m_record.phone,m_record.address);if(f_srm.Length==f_srm.Position)//如果已经读到文件的末尾，则跳出循环{break;}}Console.WriteLine("**************************************************");f_srm.Close();}public void Erase(){//清空所有记录try{//FileMode.Create指定操作系统应创建新文件。如果文件已存在，它将被改写。f_srm=new FileStream(s_filename,FileMode.Create);//对现有的phonebook.txt文件进行修改}catch{Console.WriteLine("PhoneBook Error!");return;}f_srm.Close();Console.WriteLine("Now the book is empty!");}}class Test{public static void Main(){//注意，先要创建指定的目录PhoneBook pbook=new PhoneBook("f://c#//file//phonebook.txt");while(true){int i=pbook.Open();//初始化，选择功能switch(i){case 1://列出电话本里的信息pbook.List();break;case 2://添加新记录pbook.AddNew();break;case 3://删除电话本里所有的记录pbook.Erase();break;}if(i==0)//如果选择的是0，退出，避免死循环{break;}}}}

以上示例，是一个简单的通讯录的操作，包括添加、显示和删除功能。