Cannot insert duplicate key in object - How to create composite key in Entity Framework Core

EntityFramework - Composite Key Table with FK to another Composite Key Table

I have ...two stools... and ...layered main keys..., and ...Both... has ...a foreign key on one of the main keys... to another table in common....The issue is that the foreign keys get messed up when I create migrations....I have to employ data annotations....Example:...public class City { [Key, Column(Order = 1)] [DatabaseGenerated(Databas...

EF 6.1.3 - Cannot insert duplicate key in object

I looked online for a solution to my issue, but I haven't found one. I have two things....public class Article { [Key] public Guid ID { get; set; } public Guid? ApprovedBy_ID { get; set; } public Guid CreatedBy_ID { get; set; } public virtual Profile ApprovedBy { get; set; } public virtual Profile CreatedBy { get; set; } ...

Composite key Entity Framework 7 "The Property Cannot Be added to Entity Type

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Creating composite primary key consisting off foreign keys in fluent API with ASP.NET core

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Many-to-many relationship in Entity Framework Core when one entity has composite primary key

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EF core: cannot insert object with foreign key using ID properties (only navigation properties work)

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Microsoft Entity Framework Core: Cannot insert duplicate key in object

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Entity Framework Core: Violation of PRIMARY KEY constraint Cannot insert duplicate key in object

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ASP.NET EF CORE: Composite key composed of two foreign keys not evaluating properly

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How to change single primary key to composite primary key with EF Core

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