Is there any way I can set the foreign key in EF Core without having explicitly set the properties on both entities? 535. In my case I needed to include an additional foriegnKey annotation on the "Match" entity, because my fields/tables have strings for PK's. In these cases there cannot be a foreign key because the dependent's foreign key IS its primary key. In EF-core (current version 2.2.1) composite primary keys can't be modeled by data annotations. If you want to avoid fluent api (for whatever reason #differentdiscussion) this works fantastically. ... How to set ForeignKey column name in fluent API on EF Core. The composite key consists of ProjectId and SectionOdKey. It is used to express the relationship between two tables. A key serves as a unique identifier for each entity instance. The mapping is almost identical: The 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 property or properties other than those that form the primary key. The Entity Framework Core Fluent API OnDelete method is used to specify the action which should take place on a dependent entity in a relationship when the principal is deleted.. This is not possible in my case, since all my tables have a foreign key to it. ... Two Foreign Keys in Entity Framework Core. ... EF Fluent API + two column composite uniqueness + autoincrement primary key. Now without attributes, only fluent api. I'm trying to give my Foreign Key column the name I want. Any time you have a 1:1 or 1:0..1 relationship, the dependent entity will take the same primary key as the principal. Here is an example showing how to create a composite unique key via fluent API. In this article. Also, updated to EF 1.1.0-preview1. It throws a run-time exception: Entity type 'Parent' has composite primary key defined with data annotations. The OnDelete method takes a DeleteBehavior enum as a parameter:. – Dmitry Oct 27 '16 at 16:06. … Ask Question Asked 4 years, 1 ... now it's about column name too. Thanks, c# ef-code-first ef-migrations entity-framework entity-framework-6. String representation of an Enum. 75. The ForeignKey attribute is used to specify which property is the foreign key in a relationship.. The default code first convention for ForeignKey relationship expects foreign key property name match with the primary key property. Entity Framework Core. 2. EF Core 2.2 - Two foreign keys to same table. Entity Framework relationship with two foreign keys. So for this: However, if the key or foreign key properties do not follow the convention, then you can use data annotation attributes or Fluent API to configure a one-to-one relationship between the two entities. Related. To set composite primary key, use fluent API. Entity Framework Code First - Defining Foreign Keys using Data Annotations and Fluent API When using Entity Framework Code First approach, there are actually three ways to define foreign keys. EF Core 5; Articles; Knowledge Base; Online Examples; Navigation property without foreign key, or fluent api version? The ForeignKey attribute is used to specify which property is the foreign key in a relationship. Cascade - dependents should be deleted; Restrict - dependents are unaffected; SetNull - the foreign key values in dependent rows should update to NULL You can only map EF foreign key properties when one side of the relationship is a one, and the other is a many. So for EF-core only option 3 is feasible. 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