fileupload在asp.net中不起作用 [英] fileupload is not working in asp.net

问题描述

嘿伙计们，我认为我的visual studio 2013有问题。我的fileupload没有提供任何文件名，每次提供一个空值，以前它运行正常并上传文件但现在它不工作



代码/////



i在asp.net网页上创建fileupload，并在测试fileupload是否获得值。

 <   asp：按钮    ID   =  Button4    runat   =  server    OnClick   =  Button4_Click   文本  = 按钮    /  >  
 <   asp：FileUpload     ID   =  FileUpload3    runat   =  server    /  >  
 

 受保护  void  Button4_Click（ object <> span  sender，EventArgs e）
 {
  string  fname =   ，fn =  ; 
 fname = FileUpload3.FileName; 
 
} 
 

上述简单代码变量'fname'中的
获得空值总是来自fileupload。

有什么问题？我的视觉工作室有问题吗？

解决方案

如果您使用Updatepanel，请在updatepanel下复制此代码：

< Triggers>

< asp：PostBackTrigger ControlID =Button4/>

< /触发器>

如果你有一个可能性使用更新面板然后fileupload将变为null。

如果不是，那么

尝试使用FileUpload1.PostedFile.FileName;

hey guys i think there is something wrong with my visual studio 2013. my fileupload is not provide any filename ,every time it is giving a null value , previously it was running correctly and upload a file too but now it is not working

code/////

i have create fileupload in asp.net webpage and a button to test that whether fileupload get a value or not.

<asp:Button ID="Button4" runat="server" OnClick="Button4_Click" Text="Button" />
                            <asp:FileUpload ID="FileUpload3" runat="server" />

protected void Button4_Click(object sender, EventArgs e)
   {
       string fname = "", fn = "";
       fname = FileUpload3.FileName;

   }

in the above simple code variable 'fname' is getting a null value always from fileupload.
what is the problem ? is this a problem with my visual studio?

解决方案

If you use Updatepanel then copy this code under updatepanel:
<Triggers>
<asp:PostBackTrigger ControlID="Button4" />
</Triggers>

one posibility is that if you used update panel then fileupload will be become null.
if its not ,then
try to use FileUpload1.PostedFile.FileName;

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