文件上传在ASP.NET中的实现

最新推荐文章于 2025-12-28 13:38:54 发布

原创最新推荐文章于 2025-12-28 13:38:54 发布 · 136 阅读

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#xhtml #ui #c#

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本文介绍了两种在ASP.NET中实现文件上传的方法：一种是使用FileUpload控件，另一种是使用HTML的input type=file标签。文章详细展示了如何检查文件类型、保存文件，并提供了完整的代码示例。

1、使用FileUpload控件

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Study_FileUpload1.aspx.cs" Inherits="StudyFromNow.Study_FileUpload1" %>

<!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>上传-FileUpload</title>
</head>
<body>
    <form id="Form1" runat="server">
        <div>
            <fieldset style="width: 290px">
                <legend>FileUpload控件</legend>
                <br />
                <asp:FileUpload ID="FileUpload1" runat="server" />
                <asp:Button ID="BtnUpload" runat="server" Text="上传" OnClick="BtnUpload_Click" />
                <hr />
                <asp:Label ID="lblMsg" runat="server" ForeColor="red" /><br />
                <asp:Label ID="lblMsg2" runat="server" />
            </fieldset>
        </div>
    </form>
</body>
</html>

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 StudyFromNow
{
    public partial class Study_FileUpload1 : System.Web.UI.Page
    {

        protected void Page_Load(object sender, EventArgs e)
        {
        }
        protected void BtnUpload_Click(object sender, EventArgs e)
        {
            bool isAllowed = false;
            string destPath = Server.MapPath("~/Temp/");
            if (FileUpload1.HasFile)
            {
                String fileExtension = System.IO.Path.GetExtension(FileUpload1.FileName).ToLower();
                String[] allowedExtensions = { ".gif", ".png", ".bmp", ".jpg" };
                for (int i = 0; i < allowedExtensions.Length; i++)
                {
                    if (fileExtension == allowedExtensions[i])
                    {
                        isAllowed = true;
                    }
                }
            }
            if (isAllowed)
            {
                try
                {
                    FileUpload1.SaveAs(destPath + FileUpload1.FileName);
                    lblMsg.Text = "文件上传成功.";
                    lblMsg2.Text = "<b>原文件路径：</b>" + FileUpload1.PostedFile.FileName + "<br />" +
                                  "<b>文件大小：</b>" + FileUpload1.PostedFile.ContentLength + "字节<br />" +
                                  "<b>文件类型：</b>" + FileUpload1.PostedFile.ContentType + "<br />";
                }
                catch (Exception ex)
                {
                    lblMsg.Text = "文件上传不成功.";
                }
            }
            else
            {
                lblMsg.Text = "只能够上传图片文件.";
            }
        }
    }
}

2、使用 input type="file"

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Study_FileUpload2.aspx.cs"
    Inherits="StudyFromNow.Study_FileUpload2" %>

<!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>文件上传-INPUT</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <fieldset>
            <legend>文件上传-INPUT</legend>
            <input type="file" id="UploadFile" name="UploadFile" runat="server" />
            <br />
            <asp:Button ID="btn_upload" runat="server" Text="上传" OnClick="btn_upload_Click" />
            <hr />
            <asp:Label ID="lblMsg" runat="server" ForeColor="red" /><br />
            <asp:Label ID="lblMsg2" runat="server" />
        </fieldset>
    </div>
    </form>
</body>
</html>

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 StudyFromNow
{
    public partial class Study_FileUpload2 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void btn_upload_Click(object sender, EventArgs e)
        {


            if (UploadFile.PostedFile.FileName.Trim() != "")
            {

                bool isAllowed = false;
                isAllowed = fileChecked(UploadFile);
                string destPath = Server.MapPath("~/Temp/");
                string fileName = UploadFile.PostedFile.FileName;
                fileName = fileName.Substring(fileName.LastIndexOf("\\") + 1);

                if (isAllowed)
                {
                    try
                    {
                        UploadFile.PostedFile.SaveAs(destPath + fileName);

                        lblMsg.Text = "文件上传成功.";
                        lblMsg2.Text = "<b>原文件路径：</b>" + UploadFile.PostedFile.FileName + "<br />" +
                                      "<b>文件大小：</b>" + UploadFile.PostedFile.ContentLength + "字节<br />" +
                                      "<b>文件类型：</b>" + UploadFile.PostedFile.ContentType + "<br />";
                    }
                    catch (Exception ex)
                    {
                        lblMsg.Text = "文件上传不成功.";

                    }

                }
                else
                {
                    lblMsg.Text = "只能够上传图片文件.";
                }

            }


        }

        private bool fileChecked(HtmlInputFile UploadFile)
        {
            bool isAllowed = false;
            string fileExtension = System.IO.Path.GetExtension(UploadFile.PostedFile.FileName.Trim());
            string[] allowedExtenstions = { ".gif", ".png", ".bmp", ".jpg" };

            for (int i = 0; i < allowedExtenstions.Length; i++)
            {

                if (fileExtension == allowedExtenstions[i])
                {
                    isAllowed = true;
                }
                else
                {
                    isAllowed = false;
                }

            }
            return isAllowed;
        }


    }
}

注：两种方法基本相同，只是cs文件对于上传文件处理略有不同，作为记录，方便查阅。