asp.net多文件上传使用html控件的File控件，在form中就需要加入【 enctype="multipart/form-data"】。
up3.aspx文件代码
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="up3.aspx.cs" Inherits="up3" %> <!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></title> <script language="javascript" type="text/javascript"> function addFile() { var odiv = document.getElementById("MyFile"); var str = "<div><input name='File' type='file' /></div>"; odiv.insertAdjacentHTML("beforeEnd", str); } function resetFile() { var odiv = document.getElementById("MyFile"); odiv.innerHTML = "<div><input name='File' type='file' /></div>"; } </script> </head> <body> <form id="form1" runat="server" enctype="multipart/form-data"> <input type="button" value="增加" onclick="addFile()" /> <input type="button" value="重置" onclick="resetFile()" /> <div id="MyFile"> <div><input name="File" type="file" /></div> </div> <asp:Button runat="server" Text="上传" ID="Button1" OnClick="Button1_Click" BorderColor="Desktop" BorderWidth="1px" Height="20px" Width="60px"></asp:Button> <div> <asp:Label ID="Label1" runat="server"></asp:Label> </div> </form> </body> </html>
up3.aspx.cs文件代码
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.IO; public partial class up3 : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void Button1_Click(object sender, EventArgs e) { string upPath = "/up/"; //上传文件路径 int upLength = 5; //上传文件大小 string upFileExtName = "|bmp|jpg|jpeg|png|gif|"; HttpFileCollection _files = System.Web.HttpContext.Current.Request.Files; int flag = _files.Count; int flagN = 0; int flagE = 0; int flagEE = 0; string flagEEstr = ""; for (int i = 0; i < _files.Count; i++) { string name = _files[i].FileName; FileInfo fi = new FileInfo(name); string oldfilename = fi.Name; string scExtension = fi.Extension.ToLower(); string fileName = DateTime.Now.ToString("yyyyMMddhhmmssfff") + fi.Extension; // 文件名称，当前时间（yyyyMMddhhmmssfff） string webFilePath = Server.MapPath(upPath) + fileName; // 服务器端文件路径 if (upFileExtName.IndexOf(scExtension.Replace(".", "")) == -1) { flagEE = flagEE + 1; flagEEstr = flagEEstr + "第" + (i + 1) + "个文件，文件名[" + oldfilename + "]，文件类型不符合！"; continue; } if ((fi.Length / (1024 * 1024)) > upLength) { flagEE = flagEE + 1; flagEEstr = flagEEstr + "第" + (i + 1) + "个文件，文件名[" + oldfilename + "]，超出" + upLength + "M大小限制！"; continue; } try { _files[i].SaveAs(webFilePath); } catch (Exception ex) { flagEE = flagEE + 1; flagEEstr = flagEEstr + "第" + (i + 1) + "个文件，上传异常【"+ex.Message+"】"; } } Label1.Text = "总文件【" + flag + "】，上传成功文件【" + flagN + "】，异常文件【" + (flagE + flagEE) + "】【" + flagEEstr + "】"; } }