/// <summary>
        /// 验证不允许为负数
        /// </summary>
        /// <param name="field"></param>
        /// <returns></returns>
        public static Int64Field NotBeNegative(this Int64Field field)
        {
            if (field.ShouldValidate)
            {
                if (field.Value < 0)
                {
                    throw new ValidationException(string.Concat(field.DisplayName, ":不允许为负数!"));
                }
            }

            return(field);
        }
        /// <summary>
        /// 验证必须为正数
        /// </summary>
        /// <param name="field"></param>
        /// <returns></returns>
        public static Int64Field BePositive(this Int64Field field)
        {
            if (field.ShouldValidate)
            {
                if (field.Value <= 0)
                {
                    throw new ValidationException(string.Concat(field.DisplayName, ":必须为正数!"));
                }
            }

            return(field);
        }