解决方案：
前段代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="MultiFileUpload.aspx.cs" Inherits="WebApplication1.MultiFileUpload1" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>ASP.NET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>
后端代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls; namespace WebApplication1
{
public partial class MultiFileUpload1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
} 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;
}
}
}
}
最终效果：
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