asp.net（c#）实现文件上传功能

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UpLoad.aspx

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

<!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>多文件上传 </title>
    <script language="JavaScript">
    function addFile()
    {
    var str = ' <INPUT type="file" size="50" NAME="File">'
    document.getElementById('MyFile').insertAdjacentHTML("beforeEnd",str)
    }
    </script>
</HEAD>
<body>
    <form id="form1" method="post" runat="server" enctype="multipart/form-data">
      <div align="center">
        <h3>多文件上传 </h3>
        <P id="MyFile"> <INPUT type="file" size="50" NAME="File"> </P>
        <P>
          <input type="button" value="增加(Add)" onclick="addFile()">
          <input onclick="this.form.reset()" type="button" value="重置(ReSet)">
          <asp:Button Runat="server" Text="开始上传" ID="UploadButton"> </asp:Button>
        </P>
        <P>
        <asp:Label id="strStatus" runat="server" Font-Names="宋体" Font-Bold="True" Font-Size="9pt"
          Width="500px" BorderStyle="None" BorderColor="White"> </asp:Label>
        </P>
      </div>
    </form>

</body>
</html>

UpLoad.aspx.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class WEB_Test_UpLoad : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        /// 在此处放置用户代码以初始化页面
        if (this.IsPostBack) this.SaveImages();

    }
     private Boolean SaveImages()
    {
      ///'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();
      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();
        return true;
      }
      catch(System.Exception Ex)
      {
        strStatus.Text = Ex.Message;
        return false;
      }
    }

}