一、Aspx页面：
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="FileUploadDemo.aspx.cs" Inherits="WebApplication1.FileUploadDemo" %> <!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 id="Head1" runat="server">
<title></title>
<style type="text/css">
.ddtop{ width:98%; height:30px; margin-top:5px; border:#EED97C 1px solid; margin-left:auto; margin-right:auto; margin-bottom:5px; background:#FFFCEB; font:"宋体"; font-size:14px; padding-left:10px; padding-top:10px;}
input{border-left:1px solid #333;border-top:1px solid #333;border-bottom:1px solid #ccc;border-right:1px solid #ccc;}
.button{ cursor:pointer; background-color:#1481E6;border:1px solid #fff;text-align:center;color:#fff;line-height:19px;}
.heigth_22{ height:22px;}
.width_70{ width:70px;}
</style>
<script type="text/javascript">
function setUpFileText(obj) {
var fileName = getFullPath(obj);
document.getElementById("upFileText").value = fileName;
} function getFullPath(obj) {
if (obj) {
// IE
if (window.navigator.userAgent.indexOf("MSIE") >= 1) {
obj.select();
return document.selection.createRange().text;
}
// Firefox
else if (window.navigator.userAgent.indexOf("Firefox") >= 1) {
if (obj.files) {
return obj.files.item(0).name;
}
}
// Chrome
else if (window.navigator.userAgent.indexOf("Chrome") >= 1) {
if (obj.files) {
return obj.files[0].name;
}
}
return obj.value;
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div class="ddtop">
<div>
<span><input type="text" id="upFileText" name="upFileText" readonly="readonly" /></span>
<span style="position: absolute; z-index: 2; cursor: pointer;">
<asp:FileUpload ID="fileUpload" runat="server" CssClass="width_70 heigth_22" Style="filter: alpha(opacity=0); opacity: 0; cursor: pointer;" onchange="setUpFileText(this)" accept="image/*" />
<asp:Button ID="btnOk" runat="server" Text="确定" CssClass="button width_70 heigth_22" OnClick="btnOk_Click" />
</span>
<span style="position: absolute; z-index: 1; cursor: pointer; height: 25px;">
<input type="button" name="btnUploadFile" id="btnUploadFile" value="上傳檔案" class="button width_70 heigth_22" />
</span>
</div>
</div>
</form>
</body>
</html>
二、Aspx后台代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO; namespace WebApplication1
{
public partial class FileUploadDemo : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{ } protected void btnOk_Click(object sender, EventArgs e)
{
if (this.fileUpload.HasFile)
{
string fileName = this.fileUpload.PostedFile.FileName; // 客户端文件路径
string extension = System.IO.Path.GetExtension(fileName);
if (extension.ToLower() != ".jpg" && extension.ToLower() != ".png")
{
ScriptManager.RegisterStartupScript(this, this.GetType(), "msg", "alert('只允许jpg 和 png！');", true);
return;
} string pathBase = "D:\\UploadFile";
if (!Directory.Exists(pathBase))
Directory.CreateDirectory(pathBase);
string webFilePath = Path.Combine(pathBase, fileName); // 数据库保存文件路径（相对全路径）
this.fileUpload.SaveAs(webFilePath); // 使用 SaveAs 方法保存文件
ScriptManager.RegisterStartupScript(this, this.GetType(), "msg", "alert('上傳成功，我們會盡快進行核對！');", true);
}
}
}
}