改变FileUpload文件上传控件的显示方式，确认后上传

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);
            }
        }
    }
}

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原文地址：https://www.cnblogs.com/lusunqing/p/3834100.html