What are foreign keys and primary keys?

How to define them via

annotations & Fluent API?

• Primary Key (PK): Unique identifier of a record.
• Foreign Key (FK): A field that references a PK in another table.

Data Annotations:

[Key]

public int Id { get; set; }

[ForeignKey("Blog")]

public int BlogId { get; set; }

Fluent API:

modelBuilder.Entity<Post>()

.HasKey(p => p.Id);

modelBuilder.Entity<Post>()

.HasOne(p => p.Blog)

.WithMany(b => b.Posts)

.HasForeignKey(p => p.BlogId);