如何在ASP.Net中更改Fileupload控件时获取Filename？ [英] How to get Filename on change of Fileupload control in ASP.Net?

问题描述

我在项目中使用了文件上传控件。

现在，我想在用户选择文件后立即在文本框中显示Fileupload控件中选择的文件名。

需要快速回复。

解决方案

ok
文件上传控件有一个名为FileName的属性，你可以检索一个selceted文件的名称

然而，还有另一个名为postingFile的proerty，这将检索一个类型为httpPostFile对象的对象，然后它有一个迷宫的属性为



FileUpload obj; // aleady存在于网络表单中

//将您的页面发送回服务器

 如果（mypage.IspostedBack）
 {
  if （obj.hasFile）
 {httppostedFile obj2 = obj.postedFile; 
 obj2.fileName 
 obj2.contentType 
} 
} 

依此类推..

谢谢你





Ankur：您提供的代码需要回发。

[/ Edit]

你可以使用javascript通过上传控制来显示所选文件

 <   div     class   = 控制 >  
 <   asp：fileupload     id   =  filelogo < span class =code-attribute>   runat   =  server    onchange   =   callme（）    xmlns：asp   = ＃unknown >  
 <   / asp：fileupload   >  <   / div  >  

在此处添加文本框

 <   pre     lang   =  HTML >  <   div     class   = 控制 >  
 <   asp：FileUpload     ID   =  filelogo < span class =code-attribute>   runat   =  server    onchange   =   callme（this） >  
 <   / div  >  <   / pre  >  
 <   asp：textbox     id   =  txtUploadedFileName    runat   =  server    xmlns：asp   = < span class =code-keyword>＃unknown >  <   / asp：textbox  >  

现在在.aspx文件上写这个函数

 < < /跨度> <跨度class =code-leadattribute> script     type   =  text / javascript >  
  function  callme（）
 {
  document  .getElementById（' <％= txtUploadedFileName.ClientID％>'）。value =  document  .getElementById（' <％= filelogo.ClientID％>'）。value; 
 
} 
 
 <   /   script  >  <   /   script  >  

一旦你选择了该文件的uploadcontrol名称中的任何文件将反映在文本框中。

 function callme（oFile）{
 document.getElementById（  TextBox1）。 value  = oFile。 value ; 
} 

 <   asp：FileUpload    < span class =code-attribute> ID   =  FileUpload1    runat   =  server      onchange   =  callme（this）   < span class =code-keyword> /  >  
 <   asp：TextBox     ID   =  TextBox1    runat   =  server       >  <   / asp：TextBox  >  

Ankur：但这会给你完整的路径。

你可以很容易使用javascript从中提取文件名。

[/编辑]

快乐编码：）

I have used a File upload control in my project.
Now, i want to display Filename selected in Fileupload control in a textbox as soon as user selects a file.
Need quick reply.

解决方案

ok the file upload control has a property called FileName you can retrieve the name of a selceted file
however ,there is another proerty called postedFile this will retrieve an object of type httpPostFile object then it has a mazing porperties as

FileUpload obj;//aleady exist in the web form
//send your page back to server

if(mypage.IspostedBack)
{
if(obj.hasFile)
{httppostedFile obj2=obj.postedFile;
obj2.fileName
obj2.contentType
}
}

and so on..
thank u

[Edit]
Ankur: The code you have given, needs a postback.
[/Edit]

you can use javascript to show selected file by upload controle

<div class="controls">
<asp:fileupload id="filelogo" runat="server" onchange="callme()" xmlns:asp="#unknown">
</asp:fileupload></div>

add textbox here

<pre lang="HTML"><div class="controls">
<asp:FileUpload ID="filelogo" runat="server" onchange="callme(this)">
</div></pre>
<asp:textbox id="txtUploadedFileName" runat="server" xmlns:asp="#unknown"></asp:textbox>

now write the function on .aspx file

<script type="text/javascript">
function callme()
  {
   document.getElementById('<%=txtUploadedFileName.ClientID%>').value=document.getElementById('<%=filelogo.ClientID %>').value;
            
  }

</script></script>

once you will select any file in uploadcontrol name of that file will reflect in text box.

function callme(oFile) {
         document.getElementById("TextBox1").value= oFile.value;
       }

<asp:FileUpload ID="FileUpload1" runat="server"  onchange="callme(this)" />
       <asp:TextBox ID="TextBox1" runat="server"   ></asp:TextBox>

[Edit]
Ankur: But that would give you the full path.
You can easily extract the file name from that using javascript.
[/Edit]
Happy codding :)

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