ValueObject as Entity ID, EntityTypeConfiguration Sample

markdown 問題：https://stackoverflow.com/questions/53328201/ef-core-non-primitive-type-value-object-as-primary-key 參考來源：https://github.com/dotnet/efcore/issues/13669 ``` public class User { public UserId Id { get; set; } public Credentials Credentials { get; set; } } public class UserId { private UserId() { } private UserId(long id) { Id = id; } public long Id { get; private set; } public static implicit operator long(UserId beaconId) { return beaconId.Id; } public static implicit operator UserId(long id) { return new UserId(id); } public override bool Equals(object obj) { if (obj == null) { return false; } var userId = (UserId) obj; return this.Id == userId.Id; } public override int GetHashCode() { return Id.GetHashCode(); } } public class TestDbContext: DbContext { public TestDbContext(DbContextOptions options): base(options) { } public DbSet Users { get; set; } protected override void OnModelCreating(ModelBuilder modelBuilder) { var userModelBuilder = modelBuilder.Entity(); userModelBuilder.Property(x => x.Id).HasConversion(x => x.Id, value => new UserId(value)).HasColumnName("Id").IsRequired(); userModelBuilder.OwnsOne(x => x.Credentials, c => { c.Property(x => x.Email); c.Property(x => x.Password); }); } } ```