使用Code-First MVC5 EF6在SQL表中存储DateTime属性而不是字节数组

Question

当我尝试在MVC5中使用EF6初始化我的数据库时，我收到错误：属性'Timestamp'不是Byte数组。 IsRowVersion只能配置为字节数组属性。有没有办法可以使用FluentAPI覆盖IsRowVersion，还是有另一种方法可以使用MVC5 EF6存储DateTime，或者这只是使用Timestamp数据注释的结果？我更喜欢将其存储为DateTime而不是字节数组。仅用于可视化模型看起来像这样：

    public class UserProfile : IdentityUser
    {

        //ctor
        public UserProfile()
        {
            Random rnd = new Random();
            int pic = rnd.Next(1, 6); 

            DateJoined = DateTime.Now;
            UserLevel = 4;
            ImageUrl = "/Content/Avatars/Samples/sample" + pic + ".jpg"; // or append .jpg which == .jpg
        }

        public UserProfile(string name, string url)
        {
            UserName = name;
            DateJoined = DateTime.Now;
            UserLevel = 4;
            ImageUrl = url;
            Email = "your@email.com";
        }

        public UserProfile(string name, string url, string email)
        {
            Random rnd = new Random();
            int pic = rnd.Next(1, 6);
            UserName = name;
            DateJoined = DateTime.Now;
            UserLevel = 4;
            ImageUrl = "/Content/Avatars/sample" + pic + ".jpg"; // or append .jpg which == .jpg
            Email = email;
        }
        [Key]
        [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
        public int UserId { get; set; }
        [Required(ErrorMessage="*Username is required."), RegularExpression(@"^[\p{L} \p{Nd}_]+$")]
         [MinLengthAttribute(5, ErrorMessage="Not enough characters! UserName must be at least 5 chars."), MaxLengthAttribute(30,ErrorMessage="Too many characters in UserName!")]
        public override string UserName { get; set; }
        [Required(ErrorMessage="*Email is required."), EmailAddress, RegularExpression(@"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*")]
        [DataType(DataType.EmailAddress)]
        [Display(Name = "Email address")]
        public string Email { get; set; }
        [ScaffoldColumn(false),Required]
        public string ImageUrl { get; set; }
        [DisplayFormat(DataFormatString = "{0}")] //{0:d} or {0:D}
        [DataType(DataType.DateTime), Timestamp, ScaffoldColumn(false)] //<--Problem 
        public DateTime DateJoined { get; set; }
        [Range(1, 6), ScaffoldColumn(false)]
        public int UserLevel { get; set; }
        [ScaffoldColumn(false)]
        public int? TotalRepPoints { get; set; }
        [ScaffoldColumn(false)]
        public virtual IDictionary<int, int> TotalPointsByCat { get; set; }
        // int = CategoryId, int = UserRank
        public virtual IDictionary<int, int> Rankings { get; set; }
        public virtual ICollection<Article> Articles { get; set; }
        public virtual ICollection<Answer> Answers { get; set; }
        public virtual ICollection<Vote> Votes { get; set; }
        public virtual ICollection<Question> Questions { get; set; }

    }

当我使用NuGet控制台时：

 PM> Enable-Migrations -Force
Checking if the context targets an existing database...
System.InvalidOperationException: The property 'Timestamp' is not a Byte array. IsRowVersion can only be configured for Byte array properties.
   at System.Data.Entity.ModelConfiguration.Configuration.ConventionPrimitivePropertyConfiguration.IsRowVersion()
   at System.Data.Entity.ModelConfiguration.Conventions.TimestampAttributeConvention.Apply(ConventionPrimitivePropertyConfiguration configuration, TimestampAttribute attribute)
   at System.Data.Entity.Migrations.MigrationsDomainCommand.Execute(Action command)
...
    The property 'Timestamp' is not a Byte array. IsRowVersion can only be configured for Byte array properties.
    PM> 

提前致谢！

---

修改

使用数据注释[DataType(DataType.DateTime)]存储属性时 使用DateTime?类，您将获得SQL中的datetime类型字段。

使用数据注释[Timestamp]存储属性时 使用byte[]，您将在SQL中获得时间戳类型字段。

Answer 1

从Microsoft documentation on timestamp (AKA rowversion)（强调添加）：

  

是一种在数据库中公开自动生成的唯一二进制数的数据类型。 rowversion通常用作版本标记表行的机制。存储大小为8个字节。 rowversion数据类型只是一个递增的数字，不会保留日期或时间。要记录日期或时间，请使用datetime2数据类型。

所以这个数据类型，尽管它的旧名称，基本上与我们通常认为的实际日期时间值无关。

选择其他列类型，例如datetime。