object转成DateTime?输出

2014-12-31 15:36:15 访问(1486) 赞(0) 踩(0)



        /// <summary>
        /// object转成DateTime?输出
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public DateTime? DateTimeNullConvertTo(object obj)
        {

            if (obj is DateTime)
                return (DateTime)obj;

            if (obj == null)
                return null;

            string str = obj.ToString();

            if (str.Length == 0)
                return null;

            DateTime theResult = DateTime.MinValue;

            if (DateTime.TryParse(str, out theResult))
                return theResult;

            throw new Exception
                   (
                       "方法："
                       + MethodBase.GetCurrentMethod().ReflectedType.FullName
                       + " "
                       + MethodBase.GetCurrentMethod().ToString()
                       + " 发生异常："
                       + "obj == " + str + " 不是有效的时间值。"
                   );

        }

        /// <summary>
        /// object转成DateTime?输出，不符合条件则返回defaultValue
        /// </summary>
        /// <param name="obj"></param>
        /// <param name="defaultValue"></param>
        /// <returns></returns>
        public DateTime? DateTimeNullConvertTo(object obj, DateTime? defaultValue)
        {

            if (obj is DateTime)
                return (DateTime)obj;

            if (obj == null)
                return null;

            string str = obj.ToString();

            if (str.Length == 0)
                return null;

            DateTime theResult = DateTime.MinValue;

            if (DateTime.TryParse(str, out theResult))
                return theResult;

            return defaultValue;
        }