.NET 图片上传接收类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
using System.Configuration;
using System.Web.Configuration;
using System.Collections;
using System.Text.RegularExpressions;

namespace Visaok.ul.UserCenter.dialogs.attachment
{
    public partial class upfile : System.Web.UI.Page
    {
        public string s;

        private string state = "SUCCESS";

        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Button1_Click(object sender, EventArgs e)
        {

            string[] filetype = { ".rar", ".doc", ".docx", ".zip", ".pdf", ".txt", ".swf", ".mkv", ".avi", ".rm", ".rmvb", ".mpeg", ".mpg", ".ogg", ".mov", ".wmv", ".mp4", ".webm",".jpg" };    //文件允许格式
            int size = 100;   //文件大小限制,单位MB,同时在web.config里配置环境默认为100MB

            string uploadpath = Request.MapPath("~/");    //取得网站根目录路径


            //格式验证
            if (checkType(filetype))
            {
                //不允许的文件类型
                state = "u4e0du5141u8bb8u7684u6587u4ef6u7c7bu578b";
            }
            //大小验证
            if (checkSize(size))
            {
                //文件大小超出网站限制
                state = "u6587u4ef6u5927u5c0fu8d85u51fau7f51u7ad9u9650u5236";
            }

            //保存图片
            if (state == "SUCCESS")
            {
                //目录创建
                string Path = DateTime.Now.ToString("yyMMddHHmmss") + (new Random().Next(0, 99).ToString("00"));
                createFolder(uploadpath + "Peerfile\"+ Path);

                if (string.IsNullOrEmpty(FileUpload1.FileName)) { Response.Write("未选择文件"); return; }
                FileUpload1.SaveAs(uploadpath + "Peerfile\" + Path+"\" + FileUpload1.FileName);  //存储文件到文件夹
                FileInfo pathinfo = new FileInfo(uploadpath + "Peerfile\" + Path + "\" + FileUpload1.FileName.ToString());
                string pathtwo = WebConfigurationManager.AppSettings["path"];
                string RootDirectory = WebConfigurationManager.AppSettings["RootDirectory"];
                s = "&nbsp;&nbsp;&nbsp;&nbsp;<b><a href="" + pathtwo + Path + "/" + pathinfo.Name + ""><img style="display:inline-block;" src="" + RootDirectory + "Peer/PeerCenter/dialogs/attachment/images/icon_rar.gif">" + pathinfo.Name + "</a></b>&nbsp;&nbsp;&nbsp;&nbsp;";
                div1.InnerHtml = pathinfo.Name + "上传成功";
            }
            else
            {
                div1.InnerHtml = "上传的格式不允许";
            }
        }

    /**
    * 获取文件信息
    * @param context
    * @param string
    * @return string
    */

        public string getOtherInfo(HttpContext cxt, string field)
        {
            string info = null;
            if (cxt.Request.Form[field] != null && !String.IsNullOrEmpty(cxt.Request.Form[field]))
            {
                info = field == "fileName" ? cxt.Request.Form[field].Split(',')[1] : cxt.Request.Form[field];
            }
            return info;
        }

 
        /**
         * 重命名文件
         * @return string
         */

        private string reName()
        {
            return System.Guid.NewGuid() + getFileExt();
        }

        /**
         * 文件类型检测
         * @return bool
         */

        private bool checkType(string[] filetype)
        {
           string currentType = getFileExt();
            return Array.IndexOf(filetype, currentType) == -1;
        }

        /**
         * 文件大小检测
         * @param int
         * @return bool
         */

        private bool checkSize(int size)
        {
            //ContentLength
            return FileUpload1.PostedFile.ContentLength>= (size * 1024 * 1024);
        }

        /**
         * 获取文件扩展名
         * @return string
         */

        private string getFileExt()
        {
            string[] temp = FileUpload1.FileName.Split('.');
            return "." + temp[temp.Length - 1].ToLower();
        }

        /**
         * 按照日期自动创建存储文件夹
         */

        private void createFolder(string fintPath)
        {
            if (!Directory.Exists(fintPath))
            {
                Directory.CreateDirectory(fintPath);
            }
        }

        /**
         * 删除存储文件夹
         * @param string
         */

        public void deleteFolder(string path)
        {
            //if (Directory.Exists(path))
            //{
            //    Directory.Delete(path, true);
            //}
        }

        public static string Format(string format, string filename)
        {
            if (String.IsNullOrWhiteSpace(format))
            {
                format = "{filename}{rand:6}";
            }
            string ext = Path.GetExtension(filename);
            filename = Path.GetFileNameWithoutExtension(filename);
            format = format.Replace("{filename}", filename);
            format = new Regex(@"{rand(:?)(d+)}", RegexOptions.Compiled).Replace(format,
            new MatchEvaluator(delegate(Match match)
            {
                var digit = 6;
                if (match.Groups.Count >2)
                {
                    digit =Convert.ToInt32(match.Groups[2].Value);
                }
                var rand = new Random();
                return rand.Next((int)Math.Pow(10,digit),(int)Math.Pow(10,digit +1)).ToString();
            }));
            format = format.Replace("{time}", DateTime.Now.Ticks.ToString());
            format = format.Replace("{yyyy}", DateTime.Now.Year.ToString());
            format = format.Replace("{yy}", (DateTime.Now.Year % 100).ToString("D2"));
            format = format.Replace("{mm}", DateTime.Now.Month.ToString("D2"));
            format = format.Replace("{dd}", DateTime.Now.Day.ToString("D2"));
            format = format.Replace("{hh}", DateTime.Now.Hour.ToString("D2"));
            format = format.Replace("{ii}", DateTime.Now.Minute.ToString("D2"));
            format = format.Replace("{ss}", DateTime.Now.Second.ToString("D2"));
            var invalidPattern = new Regex(@"[\/:*?42<>|]");
            format = invalidPattern.Replace(format, "");
            return format + ext;
        }
    }

}