public  partial  class  _Default : System.Web.UI.Page      {          static  public ArrayList hif =  new ArrayList();  //  保存文件列表

         public  int filesUploaded = 0;  //  上传文件的数量

         protected  void Page_Load( object sender, EventArgs e)         {         }         ///   <summary>

         ///  将要上传的文件添加到listbox中

        ///   </summary>

        ///   <param name="sender"></param>

        ///   <param name="e"></param>          protected  void AddFile_Click( object sender, EventArgs e)         {              if (Page.IsPostBack ==  true)             {                 hif.Add(FindFile);                 FileList.Items.Add(FindFile.PostedFile.FileName);             }              else             { }         }          ///   <summary>

         ///  从listbox中删除指定的文件

         ///   </summary>

         ///   <param name="sender"></param>

         ///   <param name="e"></param>          protected  void RemvFile_Click( object sender, EventArgs e)         {              if (FileList.SelectedIndex == -1)             {                 TipInfo.Text = "错误 - 必须指定要删除的文件.";                  return;             }              else  if (FileList.Items.Count != 0)             {                 hif.RemoveAt(FileList.SelectedIndex);                 FileList.Items.Remove(FileList.SelectedItem.Text);                 TipInfo.Text = "";             }                    }            ///   <summary>

   ///  循环上传listbox中的文件到指定的文件夹下

   ///   </summary>

   ///   <param name="sender"></param>

   ///   <param name="e"></param>          public  void Upload_ServerClick( object sender, System.EventArgs e)         {              string baseLocation = Server.MapPath("UploadFiles/");  //  上传路径   

             string status = "";   //  上传成功后显示的文件列表         

             if ((FileList.Items.Count == 0) && (filesUploaded == 0))             {                 TipInfo.Text = "错误 - 必须指定要上传的文件.";                  return;             }              else             {                  foreach (System.Web.UI.HtmlControls.HtmlInputFile HIF  in hif)                 {                      try                     {                          string fn = System.IO.Path.GetFileName(HIF.PostedFile.FileName);                         HIF.PostedFile.SaveAs(baseLocation + fn);                         filesUploaded++;                         status += fn + "<br>";                     }                      catch (Exception err)                     {                         TipInfo.Text = "上传错误 " + baseLocation                          + "<br>" + err.ToString();                     }                 }                  if (filesUploaded == hif.Count)                 {                     TipInfo.Text = "共上传了 " + filesUploaded + " 个文件。 <br>" + status;                 }                 hif.Clear();                 FileList.Items.Clear();             }         }     }