WebJan 26, 2024 · I want to have a 2 alternate keys with this scenario : public class A { public int Id {get;set} } public class B:A { public int OtherPropertyKey {get;set} public string … By convention, a property named Id or Idwill be configured as the primary key of an entity. You can configure a single property to be the primary key of an entity as follows: You can also configure multiple properties to be the key of an entity - this is known as a composite key. Conventions will only … See more For non-composite numeric and GUID primary keys, EF Core sets up value generation for you by convention. For example, a numeric primary key in SQL Server is … See more While EF Core supports using properties of any primitive type as the primary key, including string, Guid, byte[] and others, not all databases support all types as keys. In some cases the key values can be converted to a … See more By convention, on relational databases primary keys are created with the name PK_. You can configure the name of the primary key constraint as follows: See more An alternate key serves as an alternate unique identifier for each entity instance in addition to the primary key; it can be used as the target of a relationship. When using a relational database this maps to the concept of a unique … See more
EntityTypeBuilder .HasAlternateKey Method (Microsoft ...
WebJun 2, 2024 · The issue here Book.ISBN13 is an alternate key because it is a target of an FK. EF Core does not allow null columns for any key (primary or alternate). Here is the tracking issue for dotnet/efcore#4415 for … WebMar 24, 2016 · EF Core currently does not support changing the value of alternate keys. We do have #4073 tracking removing this restriction though. BTW it only needs to be an alternate key if you want it to be used as the target key of a relationship. If you just want a unique index, then use the HasIndex () method, rather than AlternateKey () . multiple personality disorder nhs
Keys - EF Core Microsoft Learn
WebCreates an alternate key in the model for this entity type if one does not already exist over the specified properties. This will force the properties to be read-only. Use HasIndex(String[]) or HasIndex(Expression>) to specify uniqueness in the model that does not force properties to be read-only. HasAlternateKey(String[]) WebNov 24, 2024 · Entity Framework Core HasAlternateKey Method. The HasAlternateKey method creates the Unique constraint for the property in the database. The Primary Key … WebThe Entity Framework Core Fluent API HasAlternateKey method enables you to create an alternate key by placing a unique constraint (and therefore a unique index) on a … multiple personality disorder photography