C#简易上传及MessageBox的实现

最新推荐文章于 2025-04-12 15:24:24 发布

原创最新推荐文章于 2025-04-12 15:24:24 发布 · 582 阅读

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文章标签：

#c# #upload #server #xhtml #object #string

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这篇博客展示了如何使用C#实现一个简单的文件上传功能，并在用户未选择文件时通过JavaScript弹窗显示错误提示。示例代码包括ASP.NET的aspx页面和后台default.aspx.cs文件。

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aspx:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="upload._Default" %>

<!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>
    <title>文件上传</title>
</head>
<body>
    <form id="form1" runat="server" enctype="multipart/form-data">
    <div><center>欢迎分享</center></div>
    <div></div>
    <div>
        <center>
            <input id="File1" type="file" name="a" title="浏览..." runat="server" /><br />
            <asp:Button ID="Upload" runat="server" Text="上传" onclick="Upload_Click" />
        </center>
    </div>
    </form>
</body>
</html>

default.asp.cs

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

namespace upload
{
    public partial class _Default : System.Web.UI.Page
    {

        protected void Page_Load(object sender, EventArgs e)
        {
        }

        protected void Upload_Click(object sender, EventArgs e)
        {
            ///获取文件名
            ArrayList arrFileName = new ArrayList();
            arrFileName.AddRange(File1.Value.Split('//'));
            string fileName = arrFileName[arrFileName.Count - 1].ToString();

            ///获取文件要保存的路径
            String uploadPath = Page.Request.PhysicalApplicationPath + "UploadFiles//";
            //Page.Response.Write("大家"+fileName+"请看！");

            if (fileName == "")
            {

///相当于MessageBox.show()

                Response.Write(" <script language=/"javascript/"> alert(/"你没有选择文件？/") </script>");
                //Page.Response.Write("<script language=javascript>alert('你没有选择文件？');</script>");
            }
            else
            {
                ///上传文件
                //File1.PostedFile.SaveAs(uploadPath + fileName);
                Page.Response.Write("上传成功");
            }

        }
    }
}