推薦：asp.net中控制反轉怎么理解？
對IOC的解釋為：Inversion of control is a common characteristic of frameworks， so saying that these lightweight containers are special because they use inversion of control is like saying my car is special because it has wheels. 我想對這一概念執行

        #region 2.01 讀取pdf文件的總頁數 +GetPageCount(string pdf_filename)
        /// <summary>
        /// 讀取pdf文件的總頁數
        /// </summary>
        /// <param name="pdf_filename">pdf文件</param>
        /// <returns></returns>
        public static int GetPageCountByPDF(string pdf_filename)
        {
            int pageCount = 0;
            if (System.IO.File.Exists(pdf_filename))
            {
                try
                {
                    byte[] buffer = System.IO.File.ReadAllBytes(pdf_filename);
                    if (buffer != null && buffer.Length > 0)
                    {
                        pageCount = -1;
                        string pdfText = Encoding.Default.GetString(buffer);
                        Regex regex = new Regex(@"/Type\s*/Page[^s]");
                        MatchCollection conllection = regex.Matches(pdfText);
                        pageCount = conllection.Count;
                    }
                }
                catch (Exception ex)
                {
                    Souxuexiao.API.Logger.error(string.Format("讀取pdf文件的總頁數執行GetPageCountByPowerPoint函數發生異常原因是:{0}", ex.Message));
                }
            }
            return pageCount;
        }
        #endregion

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