不管是BS还是CS都经常要用到文件上传 以下是ASP.NET同时上传多个附件的代码
<%@ Page language="c#" Codebehind="UpLoad.aspx.cs" AutoEventWireup="false" Inherits="WebPortal.Upload" %> 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" > <HTML> <HEAD> <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> 代码部分 using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Drawing; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; namespace WebPortal { /// <summary> /// UpLoad 的摘要说明。 /// 实现多文件上传 /// </summary> public class Upload : System.Web.UI.Page { protected System.Web.UI.WebControls.Button UploadButton; protected System.Web.UI.WebControls.Label strStatus; private void Page_Load(object sender, System.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; } } 
Web 窗体设计器生成的代码 } }