在autopostback中从fileupload中选择Item Vanish。 [英] While in autopostback selected Item Vanish from fileupload.

问题描述

protected void Page_Load(object sender, EventArgs e)
   {
       if (this.Session["FileUpload1"] == null && FileUpload1.HasFile)
       {
           this.Session["FileUpload1"] = FileUpload1;
       }
       else if (this.Session["FileUpload1"] != null && FileUpload1.HasFile)
       {
           FileUpload1 = (FileUpload)this.Session["FileUpload1"];
       }


       else  if (!IsPostBack)
       {



           Session["CheckRefresh"] = Server.UrlDecode(System.DateTime.Now.ToString());
           if (this.Session["FileUpload1"] == null && FileUpload1.HasFile)
           {
               this.Session["FileUpload1"] = FileUpload1;
           }
           else if (this.Session["FileUpload1"] != null && FileUpload1.HasFile)
           {
               FileUpload1 = (FileUpload)this.Session["FileUpload1"];
           }
           else if (FileUpload1.HasFile)
           {
               this.Session["FileUpload1"] = FileUpload1;
           }
           Bindstate();
           Bindclass();
       }
       else if (FileUpload1.HasFile)
       {
           this.Session["FileUpload1"] = FileUpload1;
       }
       else
       {
       }


   }

推荐答案

将所有控件放在Asp.net更新面板中。另外，为了将文件发布到服务器，请在提交按钮上使用回发触发器。

Place all your controls within Asp.net Update Panel. Also, in order to post the file to the server use Postback "trigger" on submit button.

当页面回发时，fileupload控件将从控件中删除文件，所以你必须更改客户端的下拉列表

when page was post back at that time fileupload control will remove the file from the control so you have to change the dropdown at client side

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