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The entity type has multiple properties with the [Key] attribute. Code Example
The entity type has multiple properties with the [Key] attribute. 
public class NorthwindContext : DbContext
{
     public NorthwindContext(DbContextOptions<NorthwindContext> options):base(options) { }

     public NorthwindContext() { }

     protected override void OnModelCreating(ModelBuilder builder)
     {
         builder.Entity<Relationship>().HasKey(table => new {
         table.FriendId, table.UserId
         });
     }
     public DbSet<Relationship> Relationships { get; set; }
     public DbSet<User> Users { get; set; }
}
Source: stackoverflow.com



Csharp

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Sub Category:
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Horje