c#文件的追加

   C#追加文件新建文件
   sWriter=new StreamWriter(Server.MapPath(".")+"\\myText.txt",false,System.Text.Encoding.Default);
   sw.WriteLine("追逐理想"); 
sw.WriteLine("kzlll"); 
sw.WriteLine(".NET笔记"); 
sw.Flush(); 
sw.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 
}