asp.net中的fileupload控制问题 [英] fileupload contol problem in asp.net

问题描述

heyy ..我正在使用fileupload控件。我的问题是当我从文件上传中选择文件时，之后我点击了一个按钮..然后我在fileupload控件中显示的上传文件路径消失了.... br $> b $ b

plz告诉我该怎么做..？

解决方案

。然后我的上传文件路径在fileupload控件中显示消失....

这是按照fileupload控件设计的。文件路径不会通过回发保留。

添加更新面板并将回发触发器设置为上传文件的按钮



例如： -

 < ;   asp：UpdatePanel     ID   =  UpdatePanel    runat   =  server >  
 <  触发器 >  <   asp：PostBackTrigger    控制ID   =  btnUpload    /  >  <   /触发器 >  
 <   ContentTemplate  >  
 <   asp：FileUpload     ID   =  FileUploadControl    EnableViewState   =  true    runat   =  server    /  >  
 <   asp：按钮    ID   =  btnUpload    runat   =  server   文本  = 上传    OnClick   =  btnUpload_Click  
   
  < span class =code-attribute>                                                  < span class =code-attribute>                               CssClass   =  inputButton    /  >  
 
 <   / ContentTemplate  >  
 <  < span class =code-leadattribute> / asp：UpdatePanel  >  

谢谢，

每当在页面上执行回发时，fileupload控件就会失去其状态。这就是说你不能在回发后让它保存你的文件。这是默认情况下的行为。在页面加载事件中添加以下代码并尝试。

 如果 （会话[  UploadedFile] ==  null && FileUpload1.HasFile）
会话[  UploadedFile] = FileUpload1 ; 
  else   if （会话[  UploadedFile]！=  null &&（！FileUpload1.HasFile））
 FileUpload1 =（FileUpload）会话[  UploadedFile]; 
  else   if （FileUpload1.HasFile）
 Session [  UploadedFile] = FileUpload1; 

heyy .. I am using a fileupload contol..My problem is when I select the file from file upload and after that I clicked a button ..then my upload file path showing in fileupload control is disappear....

plz tell me what to doo..?

解决方案

.then my upload file path showing in fileupload control is disappear....
That''s as designed as per fileupload control. The filepath is not retained through postbacks.

Add an update panel and set a postback trigger to the button on which you are uploading the file

e.g :-

<asp:UpdatePanel ID="UpdatePanel" runat="server">
<Triggers><asp:PostBackTrigger ControlID="btnUpload" /></Triggers>
    <ContentTemplate>
 <asp:FileUpload ID="FileUploadControl" EnableViewState="true" runat="server" />
                                    <asp:Button ID="btnUpload" runat="server" Text="Upload" OnClick="btnUpload_Click"

                                        CssClass="inputButton" />

    </ContentTemplate>
</asp:UpdatePanel>

Thanks,

Whenever a postback is performed on a page, the fileupload control loses its state. That said you can not make it hold your file after postback. That is its behaviour by default. Add the following code in Page Load event and try.

if (Session["UploadedFile"] == null && FileUpload1.HasFile) 
Session["UploadedFile"] = FileUpload1;
else if (Session["UploadedFile"] != null && (! FileUpload1.HasFile)) 
FileUpload1= (FileUpload) Session["UploadedFile"]; 
else if (FileUpload1.HasFile) 
Session["UploadedFile"] = FileUpload1; 

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