static void DeleteDirectory(string dir)    {        if (Directory.GetDirectories(dir).Length == 0 && Directory.GetFiles(dir).Length == 0)        {            Directory.Delete(dir);//删除文件夹，若不删除文件夹则不需要 Directory.Delete(dir)            return;        }        foreach (string var in Directory.GetDirectories(dir))        {            DeleteDirectory(var);        }        foreach (string var in Directory.GetFiles(dir))        {            File.Delete(var);        }        Directory.Delete(dir));//删除文件夹，若不删除文件夹则不需要 Directory.Delete(dir)    }

 调用方法如：

protected void Button_Click(object sender, EventArgs e)    {        string dir = "E:/HQSearch/upfiles/";        DeleteDirectory(dir);        Response.Write("");    }

 

或者更为简洁的写法

protected void Button_Click(object sender, EventArgs e)    {        foreach (string d in Directory.GetFileSystemEntries("E:/HQSearch/upfiles/20090118030907.xls"))            {                if (File.Exists(d))                {                    File.Delete(d); //直接删除其中的文件                       Response.Write("");                }            }        }