UTC格式转换 & 十六进制换算为十进制

UTC格式转换成北京时间格式：

 /// <summary>
        /// UTC格式与datatime的转换
        /// </summary>
        /// <param name="utc"></param>
        /// <returns></returns>
        public  DateTime ConvertIntDatetime(double utc)
        {
            System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));

            startTime = startTime.AddSeconds(utc);

            startTime = startTime.AddHours(8);//转化为北京时间(北京时间=UTC时间+8小时 )
            return startTime;
        } 

十六进制换算为十进制：

 /// <summary>
        /// 十六进制换算为十进制
        /// </summary>
        /// <param name="strColorValue"></param>
        /// <returns></returns>
        public  int GetHexadecimalValue(String strColorValue)
        {
            char[] nums = strColorValue.ToCharArray();

            int total = 0;

            try
            {
                for (int i = 0; i < nums.Length; i++)
                {
                    String strNum = nums[i].ToString().ToUpper();

                    switch (strNum)
                    {
                        case "A":
                            strNum = "10";
                            break;

                        case "B":
                            strNum = "11";
                            break;

                        case "C":
                            strNum = "12";
                            break;

                        case "D":
                            strNum = "13";
                            break;

                        case "E":
                            strNum = "14";
                            break;

                        case "F":
                            strNum = "15";
                            break;

                        default:
                            break;
                    }
                    double power = Math.Pow(16, Convert.ToDouble(nums.Length - i - 1));

                    total += Convert.ToInt32(strNum) * Convert.ToInt32(power);
                }

            }
            catch (System.Exception ex)
            {
                String strErorr = ex.ToString();

                return 0;
            }


            return total;
        }