?using System;
using System.Collections.Generic;
using System.Text;

namespace Elysian
{
    public class UpFile
    {
        //上傳文件C#代碼編寫
        private string path = null;
        private string fileType = null;
        private int sizes = 0;
        /// 
        /// 初始化變量
        /// 
        public UpFile()
        {
            path = @"\pic\"; //上傳路徑
            fileType = "jpg|gif|bmp";
            sizes = 200; //傳文件的大小,默認200KB
        }

        public string Path
        {
            set
            {
                path = @"\" + value + @"\";
            }
        }

        /// 
        /// 設置上傳文件大小,單位為KB
        /// 
        public int Sizes
        {
            set
            {
                sizes = value * 1024;
            }
        }

        /// 
        /// 設置上傳文件的類型,如:jpg|gif|bmp /// 
        public string FileType
        {
            set
            {
                fileType = value;
            }
        }

        /// 
        /// 上傳圖片
        /// 
        /// 上傳控件名稱
        /// true則以當前時間創建文件夾,false則為設置的文件夾
        /// 返回上傳圖片的相對路徑
        public string fileSaveAs(System.Web.UI.HtmlControls.HtmlInputFile name, bool creatDirectory)
        {
            try
            {
                string filePath = null;
                //以當前時間修改圖片的名字或創建文件夾的名字
                string modifyFileName = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString();
                //獲得站點的物理路徑
                string uploadFilePath = null;
                //如果為true則以當前時間創建文件夾,否則為設置的文件夾
                if (creatDirectory)
                {
                    uploadFilePath = System.Web.HttpContext.Current.Server.MapPath(".") + @"\" + DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + @"\";
                }
                else
                {
                    uploadFilePath = System.Web.HttpContext.Current.Server.MapPath(".") + path;
                }
                //獲得文件的上傳的路徑
                string sourcePath = name.Value.Trim();
                //判斷上傳文件是否為空
                if (sourcePath == "" || sourcePath == null)
                {
                    message("您沒有上傳數據呀，是不是搞錯了呀!");
                    return null;
                }
                //獲得文件擴展名
                string tFileType = sourcePath.Substring(sourcePath.LastIndexOf(".") + 1);
                //獲得上傳文件的大小
                long strLen = name.PostedFile.ContentLength;
                //分解允許上傳文件的格式
                string[] temp = fileType.Split('|');
                //設置上傳的文件是否是允許的格式
                bool flag = false;
                //判斷上傳文件大小
                if (strLen >= sizes)
                {

                    message("上傳的圖片不能大于" + sizes + "KB");
                    return null;
                }
                //判斷上傳的文件是否是允許的格式
                foreach (string data in temp)
                {
                    if (data == tFileType)
                    {
                        flag = true;
                        break;
                    }
                }
                //如果為真允許上傳,為假則不允許上傳
                if (!flag)
                {
                    message("目前本系統支持的格式為:" + fileType);
                    return null;
                }
                System.IO.DirectoryInfo dir = new System.IO.DirectoryInfo(uploadFilePath);
                //判斷文件夾否存在,不存在則創建
                if (!dir.Exists)
                {
                    dir.Create();
                }
                filePath = uploadFilePath + modifyFileName + "." + tFileType;
                name.PostedFile.SaveAs(filePath);
                filePath = path + modifyFileName + "." + tFileType;

                return filePath;

            }
            catch
            {
                //異常
                message("出現未知錯誤！");
                return null;
            }
        }

        private void message(string msg, string url)
        {
            System.Web.HttpContext.Current.Response.Write(" alert('" + msg + "');window.location='" + url + "'");
        }

        private void message(string msg)
        {
            System.Web.HttpContext.Current.Response.Write(" alert('" + msg + "'); ");
        }
    }
}