protected void ImageButton1_Click(object sender,ImageClickEventArgs e)
    {
        HttpPostedFile Hpf = this.FileUpload1.PostedFile;
        if (Hpf.ContentLength <= 0)
        {
            this.Info.Text = "请选择上传文件！";
            return;
        }
        string Ext = ".rar|.zip";
        Regex rg = new Regex(Ext);
        if (!rg.IsMatch(Hpf.FileName))
        {
            this.Info.Text = "不允许上传的文件，请选择rar/zip压缩文件！";
            return;
        }
        string folder = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(DateTime.Now.ToString() + Hpf.FileName,"md5").ToLower().Substring(8,16);
        string path = Server.MapPath("/") + "Item/" + folder;
        string FilePath = path + Path.GetExtension(Hpf.FileName);
        Hpf.SaveAs(FilePath);

        RegistryKey reg = Registry.ClassesRoot.OpenSubKey(@"Applications\WinRAR.exe\Shell\Open\Command");
        string rarPath = reg.GetValue("").ToString();//获取注册表rar安装路径
        rarPath = rarPath.Substring(0,rarPath.LastIndexOf(' '));
        reg.Close();

        System.Diagnostics.Process P = new Process();
        P.StartInfo.FileName = rarPath;
        Directory.CreateDirectory(path); //创建解压文件夹 

        P.StartInfo.Arguments = "x " + FilePath + " " + path;
        P.Start();//解压开始 
        P.WaitForExit();
        File.Delete(FilePath);//删除rar文件 

        Response.Write("<script type='text/javascript'>window.returnValue='/Item/" + folder + "';window.close()</" + "script>");
    }

此段代码加入将要解压文件房子c盘，解压到c盘可以，但是如果放到F盘的某个文件夹下不可以，F盘根目录下可以，之前项目连接了vss，断开后仍然不行，之前在另一项目中同样代码实现了此功能，不知何原因，速求答案，感谢之至！