关于C#进程的问题

Question

我的代码事这样的
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.IO;namespace Book
{
    public class Book 
    {
        private string bookID;
        private string bookName;
        private string publish;
        private string author;        public string BookID {
            get { return bookID; }
            set { bookID = value; }
        }
        public string BookName {
            get { return bookName; }
            set { bookName = value; }
        }
        public string Publish {
            get { return publish; }
            set { publish = value; }
        }
        public string Author {
            get { return author; }
            set { author = value; }
        }
    }    public class BookMethod
    {
        Book book = new Book();
        public void into1(string a){
            FileStream fs = new FileStream("e:\\aa.txt",FileMode.Create,FileAccess.Write);
            StreamWriter sw = new StreamWriter(fs);
            sw.WriteLine(a);
            sw.Close();
        }
        //输入
        public void into(string a) {
            StreamWriter writer = new StreamWriter("e:\\aa.txt",true);
            writer.WriteLine(a);
            writer.Close();
        }//输出所有
        public void outf() {
            string text;
            FileStream fs1 = new FileStream("e:\\aa.txt",FileMode.Open,FileAccess.Read);
            StreamReader sr = new StreamReader(fs1);
            text=sr.ReadToEnd();
            Console.WriteLine(text);
            sr.Close();
            fs1.Close();
        }
           //根据书号查询     
        public void outf1(string b) {
            FileInfo fi = new FileInfo("e:\\aa.txt");
            StreamReader sr = fi.OpenText();
            string text;            do{
                string[] text2=new string[4];
                text = sr.ReadLine();
                //?
                try { 
                    text2= text.Split(' ');
                }catch(SystemException e){
                    Console.WriteLine(e.Message);
                }
                
                if(text2[0]==b)
                Console.WriteLine(text);
            }while(text!=null);
            sr.Close();
        }
        public string outf2(string b)
        {
            FileInfo fi = new FileInfo("e:\\aa.txt");
            StreamReader sr = fi.OpenText();
            string text;
            string text3;
            do
            {
                string[] text2 = new string[4];
                text = sr.ReadLine();
                //?
                try
                {
                    text2 = text.Split(' ');
                }
                catch (SystemException e)
                {
                    Console.WriteLine(e.Message);
                }                if (text2[0] == b)
                {Console.WriteLine(text);
                 text3 = text;
                 return text3; 
                } 
            } while (text != null);
            sr.Close(); 
            return null;
        }
        //增加
        public void AddBook() {
            bool f=false;            do{
                Console.WriteLine("请输入书号!");
                string num = Console.ReadLine().Trim();
                Console.WriteLine("请输入书名!");
                string name = Console.ReadLine();
                Console.WriteLine("请输入出版社!");
                string pub = Console.ReadLine();
                Console.WriteLine("请输入作者!");
                string auth = Console.ReadLine();
                string save = num + " " + name + " " + pub + " " + auth;
                into(save);
                Console.WriteLine("是否继续添加?(Y/N)");
                string a = Console.ReadLine();
                if (a == "Y" || a == "y")
                    f = true;
                else
                    f = false;
            }while(f);
        }
       
        public string AddBook1() {
            Console.WriteLine("请输入书号!");
            string num = Console.ReadLine().Trim();
            Console.WriteLine("请输入书名!");
            string name = Console.ReadLine();
            Console.WriteLine("请输入出版社!");
            string pub = Console.ReadLine();
            Console.WriteLine("请输入作者!");
            string auth = Console.ReadLine();
            string save = num + " " + name + " " + pub + " " + auth;
            Console.WriteLine(save);
            Console.WriteLine("++++++++++++++++++++");
            return save;
        }
        //修改
        
        public void replace(string a,string b) {
            StreamReader sr1 = new StreamReader("e:\\aa.txt");
            string s = sr1.ReadToEnd();
            sr1.Close();
            try { 
               s = s.Replace(a,b);
               Console.WriteLine(s);
            }catch(SystemException ex){
                Console.WriteLine(ex.Message);
            }
            //try {
                Console.WriteLine("haha");
                into1(s);
           // }catch(SystemException e){
                Console.WriteLine("-------------");
           // }
            
            
        }
        
        public void Del(string a) {
                }
   
    class BookTest
    {
        static void Main(string[] args)
        {
            BookMethod b = new BookMethod();
            string p="";
            do{
               Console.WriteLine("请选择业务：输入0添加，1删除，2修改，3查看所有，4根据书号查看,5退出"); 
                p=Console.ReadLine();
                switch(p)
                {
                    case "0":
                        b.AddBook();
                        break;
                    case "1":
                        Console.WriteLine("请输入要删除的书号!");
                        string s = Console.ReadLine().Trim();
                        string q = b.outf2(s);
                        Console.WriteLine(q);                        b.Del(q);
                        Console.WriteLine("删除成功!");
                        break;
                    case "2":
                        /*b.replace();*/
                        Console.WriteLine("请输入要修改的书号!");
                        string c = Console.ReadLine().Trim();
                        string e= b.outf2(c);
                        Console.WriteLine("修改为:");
                        string d= b.AddBook1();
                        Console.WriteLine(e);
                        b.replace(e,d);
                        Console.WriteLine("修改成功!");
                        break;
                    case "3":
                        b.outf();
                        break;
                    case "4":
                        string a;
                        Console.WriteLine("请输入要查询的书号!");
                        a = Console.ReadLine().Trim();
                        b.outf1(a);
                        break;
                    case "5":
                        return;
                    default:
                        break;
                }
                
            }while(true);
        }
    }
}
在实现修改功能时,修改后不能写入文件,报异常 e:\\aa.txt被另一个进程使用不能访问到
是怎么回事?谢谢

Answer 1

是不是说的这步?
 
 public   void   replace(string   a,string   b)   { 
                        StreamReader   sr1   =   new   StreamReader("e:\\aa.txt"); 
                        string   s   =   sr1.ReadToEnd(); 
                        sr1.Close();                        try   {   
                              s   =   s.Replace(a,b); 
                              Console.WriteLine(s); 
                        }catch(SystemException   ex){ 
                                Console.WriteLine(ex.Message); 
                        } 
                        //try   { 
                                Console.WriteLine("haha"); 
                                into1(s); 
                      //   }catch(SystemException   e){ 
                                Console.WriteLine("-------------"); 
                      //   } 
                        
                        
                } 
 可我后面已经关闭了呀麻烦告诉我应该在哪里关闭?
不好意思,我刚刚开始接触这个,谢谢

Answer 2

String path = "your path";
using (StreamReader sr = new StreamReader(path)) 
{
   //This allows you to do one Read operation.
   Console.WriteLine(sr.ReadToEnd());
}
这样子用你的StreamReader试试