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Entity framework composite primary key - how to get order of columns. 1. EF multiple foreign key relationship on same primary key. 0. Entity Framework, Composite Key

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1) By Overriding the OnModelCreating () Method For ex: I have the model class named VehicleFeature as shown below. Entity Framework supports composite keys - primary keys that consist of more than one property. For example, you could have a Passport class whose primary key is a combination of PassportNumber and IssuingCountry. In EF Core, defining composite PK using KeyAttribute is not supported, therefore you must use fluent API to configure composite PK. build.HasKey (t => new {t.ActiveQuestionId, t.QuestionId}); Above syntax you used in your code is correct way to define composite PK. For more information see Keys in docs. entity-framework documentation: Composite Primary Key. Example. By using the .HasKey() method, a set of properties can be explicitly configured as the composite primary key of the entity.

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Composite Keys. Entity Framework Core supports composite keys - primary key values generated from two or more fields in the database.

FYI for EF Core, Option #2 is not possible, "Composite keys can only be configured using the Fluent API - conventions will never setup a composite key and you can not use Data Annotations to configure one."

1) By Overriding the OnModelCreating() Method. 2016-01-15 2019-08-05 EF one to many on part of composite primary key c# ef-core-2.0 ef-fluent-api entity-framework-core. Question. I have three layers of tables in an existing database and I'm trying to include the bottom level records when I get the middle level data 2013-01-30 EF - Composite Key 1 | Test your C# code online with .NET Fiddle code editor. 2018-02-18 2019-09-27 2014-02-11 The ForeignKey attribute is used to configure a foreign key in the relationship between two entities in EF 6 and EF Core. It overrides the default conventions.

It throws a run-time exception: Entity type 'Parent' has composite primary key defined with data annotations.
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