文件上传在更新面板中不起作用 [英] File upload not working in update panel

问题描述

i希望使用文件上传控件上传图片。我正在使用更新面板。当我提交表单时，fileupload.hasfile返回false.how我能解决这个问题吗？

解决方案

只需将以下代码添加到您的应用程序中。

将使面板回复并最终文件上载控件将开始工作。 />

 <   asp：UpdatePanel     ID   =  UpdatePanel1    runat   =  server    UpdateMode   = 有条件的 >  
 <  触发器 >  
 <   asp：PostBackTrigger  < span class =code-attribute>   ControlID   =  Button1    /  > ;  
 <   / Triggers  >  

将按钮放入单独的UpdatePanel并在那里设置PostBack触发器

Ex：

 <   asp：updatepanel     id   =   up1    runat   =   server >  <   br    mode   =  hold    xmlns：asp   = ＃unknown    /  >  <   ContentTemplate  >  
 < ;  表 >  <   tr  >  <  < span class =code-leadattribute> td  >  
 <   asp：按钮    ID   =  btnSubmit    runat   =  server    CssClass   =  tbutton    OnClick   =   btnSubmit_Click 文字  = 提交   工具提示  = 点击此处提交                         < span class =code-attribute>               ValidationGroup   = 保存    /  >  <   / td    >  

 <   / tr  >  
 <   / table  >  
 <   / ContentTemplate  >  
 <  触发器 >  
 <   asp：PostBackTrigger     ControlID   =  btnSubmit    /  >  
 <   /触发器 >  
 <   / asp：UpdatePanel  >  

试试这个 -

 Page.Form.Attributes.Add（  enctype， 多部分/格式数据）; 

Hi,
i want to upload a picture using file upload control.i am using update panel.when i am submitting the form,fileupload.hasfile returns false.how do i solve this?

解决方案

just add the following code into your application.
that will cuse the panel to postback and eventually the fileupload control will start working.

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="conditional">
 <Triggers>
  <asp:PostBackTrigger ControlID="Button1" />
 </Triggers>

Place the button into separate UpdatePanel and set the PostBack trigger there
Ex:

<asp:updatepanel id=""up1"" runat=""server"><br" mode="hold" xmlns:asp="#unknown" /><ContentTemplate>
 <table><tr> <td>
<asp:Button ID="btnSubmit" runat="server" CssClass="tbutton" OnClick="btnSubmit_Click"Text="Submit" ToolTip="Click here to Submit"                   ValidationGroup="Save" /> </td >

</tr>
 </table>
 </ContentTemplate>
 <Triggers>
 <asp:PostBackTrigger ControlID="btnSubmit" />
</Triggers>
 </asp:UpdatePanel>

try this -

Page.Form.Attributes.Add("enctype", "multipart/form-data");

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