C# 实体默认返回格式化日期

        /// <summary>
        /// 创建人名
        /// </summary>
        [NotMapped]
        public string CreateUserName { get; set; }
        /// <summary>
        /// 创建时间
        /// </summary>
        [NotMapped]
        public string CreateTimeString
        {
            get
            {
                return CreateTime.ToString("yyyy-MM-dd HH:mm:ss");
            }
        }