在以前的Web應用中，上傳檔案是個很麻煩的事，現在有了.NET，檔案上傳變得輕而易舉。下面的這個例子實作了多檔案上傳功能。可以動态添加輸入表單，上傳的檔案數量沒有限制。代碼如下：
代碼
<%@ 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>孟憲會多檔案上傳測試</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>多檔案上傳</h3>
使用者名：<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<div id="_container">
<input type="file" size="50" name="File" />
</div>
<div>
<input type="button" value="添加檔案(Add)" onclick="addFile()" />
<div style="padding:10px 0">
<asp:Button runat="server" Text="開始上傳" ID="UploadButton"
onclick="UploadButton_Click"></asp:Button>
<asp:Label ID="strStatus" runat="server" Font-Names="宋體" Font-Bold="True" Font-Size="9pt"
Width="500px" BorderStyle="None" BorderColor="White"></asp:Label>
</form>
</body>
</html>
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
{
protected void UploadButton_Click(object sender, EventArgs e)
{
///'周遊File表單元素
HttpFileCollection files = HttpContext.Current.Request.Files;
/// '狀态資訊
System.Text.StringBuilder strMsg = new System.Text.StringBuilder("您輸入的使用者名是：" + TextBox1.Text + "<br/>");
strMsg.Append("上傳的檔案分别是：<hr color='red'/>");
try
{
for (int iFile = 0; iFile < files.Count; iFile++)
{
///'檢查檔案擴充名字
HttpPostedFile postedFile = files[iFile];
string fileName, fileExtension;
fileName = System.IO.Path.GetFileName(postedFile.FileName);
if (fileName != "")
{
fileExtension = System.IO.Path.GetExtension(fileName);
strMsg.Append("上傳的檔案類型：" + postedFile.ContentType.ToString() + "<br>");
strMsg.Append("用戶端檔案位址：" + postedFile.FileName + "<br>");
strMsg.Append("上傳檔案的檔案名：" + fileName + "<br>");
strMsg.Append("上傳檔案的擴充名：" + fileExtension + "<br><hr>");
///'可根據擴充名字的不同儲存到不同的檔案夾
///注意：可能要修改你的檔案夾的匿名寫入權限。
postedFile.SaveAs(System.Web.HttpContext.Current.Request.MapPath("images/") + fileName);
}
}
strStatus.Text = strMsg.ToString();
}
catch (System.Exception Ex)
strStatus.Text = Ex.Message;
}