asp.net文件上传

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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
<!--

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--><%@ 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:TextBoxID="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:Buttonrunat="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
<!--

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-->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
{
   
protectedvoid 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;
      }

    }
}