asp.net文件上传

在以前的Web应用中，上传文件是个很麻烦的事，现在有了.NET，文件上传变得轻而易举。下面的这个例子实现了多文件上传功能。可以动态添加输入表单，上传的文件数量没有限制。代码如下：

ASPX 代码

<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/

--> <% @ Page Language = " C# " AutoEventWireup = " true " CodeFile = " MultiFileUpload.aspx.cs "
Inherits = " MultiFileUpload " %>

<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
< html xmlns ="http://www.w3.org/1999/xhtml" >
< head runat ="server" >
< title > 孟宪会多文件上传测试 </ title >

< script type ="text/javascript" >
function addFile() {
var div = document.createElement( " div " );
var f = document.createElement( " input " );
f.setAttribute( " type " , " file " )
f.setAttribute( " name " , " File " )
f.setAttribute( " size " , " 50 " )
div.appendChild(f)
var d = document.createElement( " input " );
d.setAttribute( " type " , " button " )
d.setAttribute( " onclick " , " deteFile(this) " );
d.setAttribute( " value " , " 移除 " )
div.appendChild(d)
document.getElementById( " _container " ).appendChild(div);
}

function deteFile(o) {
while (o.tagName != " DIV " ) o = o.parentNode;
o.parentNode.removeChild(o);
}
</ script >

</ head >
< body >
< form id ="form1" runat ="server" method ="post" enctype ="multipart/form-data" >
< h3 > 多文件上传 </ h3 >
用户名： < asp:TextBox ID ="TextBox1" runat ="server" ></ asp:TextBox >
< div id ="_container" >
< input type ="file" size ="50" name ="File" />
</ div >
< div >
< input type ="button" value ="添加文件(Add)" onclick ="addFile()" />
</ div >
< div style ="padding:10px 0" >
< asp:Button runat ="server" Text ="开始上传" ID ="UploadButton"
onclick ="UploadButton_Click" ></ asp:Button >
</ div >
< div >
< asp:Label ID ="strStatus" runat ="server" Font-Names ="宋体" Font-Bold ="True" Font-Size ="9pt"
Width ="500px" BorderStyle ="None" BorderColor ="White" ></ asp:Label >
</ div >
</ form >
</ body >
</ html >

C# 代码

<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/

--> using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class MultiFileUpload : System.Web.UI.Page
{
protected void UploadButton_Click( object sender, EventArgs e)
{
/// '遍历File表单元素
HttpFileCollection files = HttpContext.Current.Request.Files;

/// '状态信息
System.Text.StringBuilder strMsg = new System.Text.StringBuilder( " 您输入的用户名是： " + TextBox1.Text + " <br/> " );
strMsg.Append( " 上传的文件分别是：<hr color='red'/> " );
try
{
for ( int iFile = 0 ; iFile < files.Count; iFile ++ )
{
/// '检查文件扩展名字
HttpPostedFile postedFile = files[iFile];
string fileName, fileExtension;
fileName = System.IO.Path.GetFileName(postedFile.FileName);
if (fileName != "" )
{
fileExtension = System.IO.Path.GetExtension(fileName);
strMsg.Append( " 上传的文件类型： " + postedFile.ContentType.ToString() + " <br> " );
strMsg.Append( " 客户端文件地址： " + postedFile.FileName + " <br> " );
strMsg.Append( " 上传文件的文件名： " + fileName + " <br> " );
strMsg.Append( " 上传文件的扩展名： " + fileExtension + " <br><hr> " );
/// '可根据扩展名字的不同保存到不同的文件夹
/// 注意：可能要修改你的文件夹的匿名写入权限。
postedFile.SaveAs(System.Web.HttpContext.Current.Request.MapPath( " images/ " ) + fileName);
}
}
strStatus.Text = strMsg.ToString();
}
catch (System.Exception Ex)
{
strStatus.Text = Ex.Message;
}

}
}