学步园

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 
}