摘要：ASP.NET自带的FileUpload控件会随着浏览器的不同，显示的样式也会发生改变，很不美观，为了提高用户体验度，所以我们会去自定义FileUpload控件
实现思路：用两个Button和TextBox控件来替代FileUpload控件，当点击Button时触发FileUpload控件的点击事件，然后通过JS把FileUpload控件的Value赋给TextBox
代码：
aspx文件：
1 <html xmlns="http://www.w3.org/1999/xhtml"> 2 <head id="Head1" runat="server"> 3 <title></title> 4 </head> 5 <body> 6 <form id="form1" runat="server"> 7 <div> 8 <asp:FileUpload ID="FileUp" runat="server" Style="display:none;width: 180px" /> 9 <asp:TextBox ID="txtFileName" runat="server" MaxLength="100" Width="170px"></asp:TextBox> 10 <asp:Button id="btnBrowse" runat="server" style="width:60px" CssClass="btn" OnClientClick="return ShowBrowse()" 11 Text="Browse" /> 12 <asp:Button ID="btnUpload" runat="server" Width="60px" CssClass="btn" OnClick="btnUpload_Click" 13 Text="Upload" /> 14 </div> 15 </form> 16 <script language="javascript" type="text/javascript"> 17 function ShowBrowse() 18 { 19 var file1=document.getElementById("FileUp"); 20 if(file1) 21 { 22 file1.click(); 23 var isie = (document.all) ? true : false; //判断是IE内核还是Mozilla 24 return isie; //火狐浏览器加return false才会在选择文件后将文件名带回到textbox,IE如果返回false上传时要点击两次按钮才触发 25 } 26 } 27 </script> 28 </body> 29 </html>