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asp.net，C#，html控件的File控件文件上传简单实例，vs2010

Posted on 2013-02-17 11:35  weekzero  阅读(1739)  评论(0)  编辑  收藏  举报

文件上传是最常用的B/S项目功能，在FileUpload控件出来之前只能使用html控件的File控件，这样在form中就需要加入【 enctype="multipart/form-data"】。

实例如下，

up2.aspx代码

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="up2.aspx.cs" Inherits="up2" %>

<!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></title>
</head>
<body>
    <form id="form1" runat="server" enctype="multipart/form-data">
    <input name="File" type="file"  />
    <asp:Button ID="Button1" runat="server" CssClass="button" OnClick="Button1_Click"
        Text="上传" />
    </form>
</body>
</html>

up2.aspx.cs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;

public partial class up2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        string upPath = "/up/";  //上传文件路径
        int upLength = 5;        //上传文件大小
        string upFileExtName = "|bmp|jpg|jpeg|png|gif|";

        HttpFileCollection _files = System.Web.HttpContext.Current.Request.Files;

        for (int i = 0; i < _files.Count; i++)
        {
            string name = _files[i].FileName;

            FileInfo fi = new FileInfo(name);

            string oldfilename = fi.Name;
            string scExtension = fi.Extension.ToLower();

            string fileName = DateTime.Now.ToString("yyyyMMddhhmmssfff") + fi.Extension; // 文件名称，当前时间（yyyyMMddhhmmssfff）
            string webFilePath = Server.MapPath(upPath) + fileName;        // 服务器端文件路径

            if (upFileExtName.IndexOf(scExtension.Replace(".", "")) == -1)
            {
                ClientScript.RegisterStartupScript(this.GetType(), "upfileOK", "alert('提示：文件类型不符" + scExtension + "');", true);
                return;
            }

            if ((fi.Length / (1024 * 1024)) > upLength)
            {
                ClientScript.RegisterStartupScript(this.GetType(), "upfileOK", "alert('大小超出 " + upLength + " M的限制，请处理后再上传！');", true);
                return;
            }

            try
            {
                _files[i].SaveAs(webFilePath);

                ClientScript.RegisterStartupScript(this.GetType(), "upfileOK", "alert('提示：文件上传成功');", true);
            }
            catch (Exception ex)
            {
                ClientScript.RegisterStartupScript(this.GetType(), "upfileOK", "alert('提示：文件上传失败" + ex.Message + "');", true);
            }

        }

    }
}