model attribute

model attribute，字面意思，给model加attribute以配置数据库

主键

public class OrderDetail
{
    [Key]
    public int OrderDetailID { get; set; }
    public int OrderID { get; set; }
    public int ProductID { get; set; }
    public int Quantity { get; set; }
    public Order Order { get; set; }
}

并发令牌

public class Customer
{
    public int CustomerId { get; set; }
    public string LastName { get; set; }
    public string FirstName { get; set; }
    public string Address { get; set; }

    [ConcurrencyCheck]
    public string Version { get; set; }
}

不映射

[NotMapped]
public class BlogMetadata
{
    public DateTime LoadedFromDatabase { get; set; }
}
或 
public class Blog
{
    public int BlogId { get; set; }
    public string Url { get; set; }

    [NotMapped]
    public DateTime LoadedFromDatabase { get; set; }
}

必要

public class Blog
{
    public int BlogId { get; set; }
    [Required]
    public string Url { get; set; }
}

最大长度

public class Person
{
    public int PersonId { get; set; }

    [MaxLength(50)]
    public string LastName { get; set; }

    [MaxLength(50)]
    public string FirstName { get; set; }
}

最短长度

public class Person
{
    public int PersonId { get; set; }

    [MinLength(3)]
    public string LastName { get; set; }

    [MinLength(3)]
    public string FirstName { get; set; }
}

字符串长度

public class Person
{
    public int PersonId { get; set; }

    [StringLength(50)]
    public string LastName { get; set; }

    [StringLength(50)]
    public string FirstName { get; set; }
}

外键

public class OrderDetail
{
    public int OrderDetailID { get; set; }
    public int OrderID { get; set; }
    public int ProductID { get; set; }
    public int Quantity { get; set; }

    [ForeignKey("OrderID")]
    public Order Order { get; set; }
}

public class Order
{
    public int OrderID { get; set; }
    public int CustomerID { get; set; }
    public int EmployeeID { get; set; }
    public DateTime OrderDate { get; set; }
    public List<OrderDetail> OrderDetails { get; set; }
}

时间戳

public class Person
{
    public int PersonId { get; set; }
    public string LastName { get; set; }
    public string FirstName { get; set; }

    [Timestamp]
    public byte[] TStamp { get; set; }
}

表映射

[Table("UserInfo")]
public class Person
{
    public int PersonId { get; set; }
    public string LastName { get; set; }
    public string FirstName { get; set; }
}

列名映射

public class Person
{
    public int PersonId { get; set; }

    [Column("LName")]
    public string LastName { get; set; }

    [Column("FName")]
    public string FirstName { get; set; }
}