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" };    //文件允許格式
            int size = 100;   //文件大小限制,單位MB,同時在web.config裏配置環境默認為100MB

            string uploadpath = Request.MapPath("~/");    //
 
取得網站根目錄路徑


            //格式驗證
            if (checkType(filetype))
            {
                //不允許的文件類型
                state = "\u4e0d\u5141\u8bb8\u7684\u6587\u4ef6\u7c7b\u578b";
            }
            //大小驗證
            if (checkSize(size))
            {
                //文件大小超出網站限制
                state = "\u6587\u4ef6\u5927\u5c0f\u8d85\u51fa\u7f51\u7ad9\u9650\u5236";
            }

            //保存圖片
            if (state == "SUCCESS")
            {
                //目錄創建
                string Path = DateTime.Now.ToString("yyMMddHHmmss") + (new Random().Next(0, 99).ToString("00"));
                createFolder(uploadpath + "Peerfile\\"+ Path);

                if (string.IsNullOrEmpty(FileUpload1.FileName)) { Response.Write("未選擇文件"); return; }
                FileUpload1.SaveAs(uploadpath + "Peerfile\\" + Path+"\\" + FileUpload1.FileName);  //存儲文件到文件夾
                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 + "上傳成功";
            }
            else
            {
                div1.InnerHtml = "上傳的格式不允許";
            }
        }

    /**
    * 獲取文件信息
    * @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();
        }

        /**
         * 文件類型檢測
         * @return bool
         */

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

        /**
         * 文件大小檢測
         * @param int
         * @return bool
         */

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

        /**
         * 獲取文件擴展名
         * @return string
         */

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

        /**
         * 按照日期自動創建存儲文件夾
         */

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

        /**
         * 刪除存儲文件夾
         * @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(@"[\\\/\:\*\?\042\<\>\|]");
            format = invalidPattern.Replace(format, "");
            return format + ext;
        }
    }

}

.NET 圖片上傳接收類