Primary

This attribute marks a class property as the primary property.

Given a table [dbo].[Person] where Id is the primary field:

CREATE TABLE [dbo].[Person]
(
    [Id] [bigint] IDENTITY(1,1) NOT NULL,
    [Name] [nvarchar](128) NOT NULL
)
ON [PRIMARY];
GO

And a Person model class:

public class Person
{
    [Primary] // Primary decoration
    public long Id { get; set; }
    public string Name { get; set; }
    public int Age { get; set; }
    public DateTime CreatedDateUtc { get; set; }
}

Setting this attribute overrides the library’s auto-identification logic. If applied to a property that is not a database primary key, the library will use that property instead, which may cause some operations to fail.

To retrieve the primary property, use the PrimaryCache object.

var primary = PrimaryCache.Get<Person>();

Or by .NET CLR type:

var primary = PrimaryCache.Get(typeof(Person));