/// <summary>

        /// 获取Exif中的照片拍摄日期

        /// </summary>

        /// <param name="fileName">文件名</param>

        /// <returns>拍摄日期</returns>

        private string GetTakePicDate(string fileName)

        {

            Encoding ascii = Encoding.ASCII;

            string picDate;

            FileStream stream = new FileStream(fileName, FileMode.Open, FileAccess.Read);

            Image image = Image.FromStream(stream, true, false);

            foreach (PropertyItem p in image.PropertyItems)

            {

                //获取拍摄日期时间

                if (p.Id == 0x9003) // 0x0132 最后更新时间

                {

                    stream.Close();

                    picDate =  ascii.GetString(p.Value);

                    if ((!"".Equals(picDate)) && picDate.Length >= 10)

                    {

                        // 拍摄日期

                        picDate = picDate.Substring(0, 10);

                        picDate = picDate.Replace(":","-");

                        return picDate;

                    }

                }

            }

            stream.Close();

            return "";

        }