/// <summary>        /// 通过身份证号码判断男女        /// </summary>        /// <param name="strIDCard">空：不能为空。位数：位数不对。NULL:程序异常</param>        public static string GetSexByIDCard(string strIDCard)        {            try            {                string strSex = "";                //获取得到输入的身份证号码                if (string.IsNullOrEmpty(strIDCard))                {                    //身份证号码不能为空，如果为空返回                    strSex = "空";                    return strSex;                }                else                {                    //身份证号码只能为15位或18位其它不合法                    if (strIDCard.Length != 15 && strIDCard.Length != 18)                    {                        strSex = "位数";                        return strSex;                    }                }                //string birthday = "";                string sex = "";                //处理18位的身份证号码从号码中得到生日和性别代码                if (strIDCard.Length == 18)                {                    //birthday = strIDCard.Substring(6, 4) + "-" + strIDCard.Substring(10, 2) + "-" + strIDCard.Substring(12, 2);                    sex = strIDCard.Substring(14, 3);                }                //处理15位的身份证号码从号码中得到生日和性别代码                if (strIDCard.Length == 15)                {                    //birthday = "19" + strIDCard.Substring(6, 2) + "-" + strIDCard.Substring(8, 2) + "-" + strIDCard.Substring(10, 2);                    sex = strIDCard.Substring(12, 3);                }                //textBox_Birthday.Text = birthday;                //性别代码为偶数是女性奇数为男性                if (int.Parse(sex)%2 == 0)                {                    strSex = "女";                }                else                {                    strSex = "男";                }                return strSex;            }            catch            {                return null;            }        }