《fileupload》 

ASP.NET 图片上传-简单实用(VS2008 FileUpload控件+ASP.NET2.0)按时间+三位随机数重命名2009年07月08日 星期三 上午 08:55近期公司asp网站要向asp.net网站过渡,苦于没有一个简单实用的图片上传模块,于是自己参考网上资料写了一个,希望与喜欢asp.net的朋友共同进步。

上传文件被自动放到文件夹“UpFiles/年月”下面,没有会自动创建。

Default.aspx文件:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="FileUpload._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 runat="server">
    <title>图片上传(VS2008 FileUpload控件+ASP.NET2.0)</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
        <asp:FileUpload ID="ImgFileUpload" runat="server" />
    
        <asp:Button ID="btnFileUpload" runat="server" onclick="btnFileUpload_Click" Text="上传" /><br />
        <asp:Label ID="lblMsg" runat="server" Text=""></asp:Label>
    
    </div>
    </form>
</body>
</html>

Default.aspx.cs文件:

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.IO;
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;

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

        }

        protected void btnFileUpload_Click(object sender, EventArgs e)
        {
            UploadPicFile(ImgFileUpload);
        }


        internal readonly string AllowExt = "jpe|jpeg|jpg|png|tif|tiff|bmp|gif|wbmp|swf|psd";

        /// <summary>
        /// 检测扩展名的有效性
        /// </summary>
        /// <param name="sExt">文件名扩展名</param>
        /// <returns>如果扩展名有效,返回true,否则返回false.</returns>
        bool CheckValidExt(string sExt)
        {
            bool flag = false;
            string[] aExt = AllowExt.Split('|');
            foreach (string filetype in aExt)
            {
                if (filetype.ToLower() == sExt.Replace(".", ""))
                {
                    flag = true;
                    break;
                }
            }
            return flag;
        }
        private void UploadPicFile(System.Web.UI.WebControls.FileUpload Fupload)
        {
            //文件上传函数
            try
            {
                if (Fupload.HasFile)
                {
                    //判断文件格式
                    string sExt = Fupload.FileName.Substring(Fupload.FileName.LastIndexOf(".")).ToLower();
                    if (!CheckValidExt(sExt))
                    {
                        lblMsg.Text = "(原图片文件格式不正确!支持的格式有[ " + AllowExt + " ])";
                        return;
                    }
                    //判断文件大小
                    int intFileLength = Fupload.PostedFile.ContentLength;

                    if (intFileLength > 1000 * 1000)
                    {
                        this.lblMsg.Text = "文件大于1M,不能上传!";
                        return;
                    }

                    Random ran = new Random();

                    string UpDir = "/UpFiles/" + DateTime.Now.ToString("yyyyMM"); //上传目录
                    if (!Directory.Exists(Server.MapPath(UpDir)))
                    {
                        Directory.CreateDirectory(Server.MapPath(UpDir));
                        if (!Directory.Exists(Server.MapPath(UpDir)))
                            return; //如果创建失败则返回
                    }
                        //上传文件重命名:时间+三位随机数
                        string fileName = UpDir + "/" + DateTime.Now.ToString("yyyyMMddhhmmssfff") + Convert.ToString(ran.Next(100, 999));

                        fileName = fileName + sExt;

                        Fupload.PostedFile.SaveAs(HttpContext.Current.Server.MapPath(fileName));

                        lblMsg.Text = fileName + "上传成功!";
                    
                }
                else
                    lblMsg.Text = "请选择文件!";
                return;

            }
            catch
            {
                lblMsg.Text = "发生错误,请重新上传文件!";
            }

        }
    }
}