C#常用的文件操作

C#常用的文件操作

C#写入/读出文本文件

public   void  Page_Load(Object src,EventArgs e) 
{ 
   StreamWriter rw = File.CreateText(Server.MapPath(".")+"//myText.txt"); 
   rw.WriteLine("追逐理想"); 
   rw.WriteLine("kzlll"); 
   rw.WriteLine(".NET笔记"); 
   rw.Flush(); 
   rw.Close(); 
}

打开文本文件

StreamReader sr  =  File.OpenText(Server.MapPath( " . " ) + " //myText.txt " ); 
StringBuilder output  =   new  StringBuilder(); 
string  rl; 
while ((rl = sr.ReadLine()) != null ) 
{ 
output.Append(rl+"<br>"); 
}  
lblFile.Text  =  output.ToString(); 
sr.Close(); 
 

C#追加文件

    StreamWriter sw  =  File.AppendText(Server.MapPath( " . " ) + " //myText.txt " ); 
    sw.WriteLine( " 追逐理想 " ); 
    sw.WriteLine( " kzlll " ); 
    sw.WriteLine( " .NET笔记 " ); 
    sw.Flush(); 
    sw.Close(); 

C#拷贝文件

         string  OrignFile,NewFile; 
        OrignFile  =  Server.MapPath( " . " ) + " //myText.txt " ; 
        NewFile  =  Server.MapPath( " . " ) + " //myTextCopy.txt " ; 
        File.Copy(OrignFile,NewFile, true ); 

C#删除文件

         string  delFile  =  Server.MapPath( " . " ) + " //myTextCopy.txt " ; 
        File.Delete(delFile); 

C#移动文件

       string  OrignFile,NewFile; 
      OrignFile  =  Server.MapPath( " . " ) + " //myText.txt " ; 
      NewFile  =  Server.MapPath( " . " ) + " //myTextCopy.txt " ; 
      File.Move(OrignFile,NewFile); 

C#创建目录 

           //  创建目录c:/sixAge 
          DirectoryInfo d = Directory.CreateDirectory( " c://sixAge " ); 
           //  d1指向c:/sixAge/sixAge1 
          DirectoryInfo d1 = d.CreateSubdirectory( " sixAge1 " ); 
           //  d2指向c:/sixAge/sixAge1/sixAge1_1 
          DirectoryInfo d2 = d1.CreateSubdirectory( " sixAge1_1 " ); 
           //  将当前目录设为c:/sixAge 
          Directory.SetCurrentDirectory( " c://sixAge " ); 
           //  创建目录c:/sixAge/sixAge2 
          Directory.CreateDirectory( " sixAge2 " ); 
           //  创建目录c:/sixAge/sixAge2/sixAge2_1 
          Directory.CreateDirectory( " sixAge2//sixAge2_1 " ); 

递归删除文件夹及文件

<% @ Page Language = C# %>  
<% @ Import  namespace = " System.IO " %>  
< Script runat = server >  
public   void  DeleteFolder( string  dir) 
{ 
     if (Directory.Exists(dir))   //如果存在这个文件夹删除之 
       { 
           foreach(string d in Directory.GetFileSystemEntries(dir)) 
              { 
                 if(File.Exists(d)) 
                 File.Delete(d);    //直接删除其中的文件 
                 else 
                 DeleteFolder(d);       //递归删除子文件夹 
               } 
            Directory.Delete(dir);    //删除已空文件夹 
            Response.Write(dir+"  文件夹删除成功"); 
        } 
     else 
        Response.Write(dir+"  该文件夹不存在");  //如果文件夹不存在则提示 
}  
protected   void  Page_Load (Object sender ,EventArgs e) 
{ 
string Dir="D://gbook//11"; 
DeleteFolder(Dir);           //调用函数删除文件夹 
}  
</ Script >