EF Core 7 - error occurred: the entity type 'List<string>' requires a primary key to be defined - entity-framework-core

Question

I get an error when I use EF Core 7 to create entities.
The entity type 'List' requires a primary key to be defined. If you intended to use a keyless entity type, call 'HasNoKey' in 'OnModelCreating'. For more information on keyless entity types, see https://go.microsoft.com/fwlink/?linkid=2141943.
I have found the error prop, that's Project of service entity, when I only annotate Project of service entity, then I can run Add-Migration successfully. I don't know why and I also don't know how to fix this error.
Does somebody know this error? Please help...
public class Service : EntityBase
{
public Guid? DefaultCapacityUnitId { get; set; }
public Guid? DefaultSizeUnitId { get; set; }
public virtual SizeUnit DefaultSizeUnit { get; set; }
public Guid ProjectId { get; set; }
public Project Project { get; set; }
public Guid? ParentId { get; set; }
public virtual Service Parent { get; set; }
public Guid DisciplineId { get; set; }
public virtual Discipline Discipline { get; set; }
public virtual List<Service> SubServices { get; set; } = new List<Service>();
}
public class Equipment : EntityBase
{
public Guid ProjectId { get; set; }
public Project Project { get; set; }
public Guid? ServiceId { get; set; }
public virtual Service Service { get; set; }
public Guid DisciplineId { get; set; }
public virtual Discipline Discipline { get; set; }
}
public abstract class EntityBase
{
[Key]
public virtual Guid Id { get; set; } = Guid.NewGuid();
private string name;
[Required, MaxLength(200)]
public virtual string Name
{
get
{
return name?.Trim();
}
set
{
name = value?.Trim();
}
}
private string shortName;
[Required, MaxLength(100)]
public virtual string ShortName
{
get
{
return shortName?.Trim();
}
set
{
shortName = value?.Trim();
}
}
[NotMapped]
public EntityBase Snapshot { get; set; }
[NotMapped]
public List<string> ValueChangedProperties { get; set; } = new List<string>();
}
public class Project : EntityBase
{
}
public class Discipline : EntityBase
{
public Guid ProjectId { get; set; }
public virtual Project Project { get; set; }
public virtual List<Service> Services { get; set; } = new List<Service>();
public Guid? ScenarioId { get; set; }
public Guid? ParentId { get; set; }
public virtual Discipline Parent { get; set; }
}
public partial class TestDbContext : DbContext
{
public TestDbContext(DbContextOptions<TestDbContext> options)
: base(options)
{ }
public TestDbContext()
{
}
public DbSet<Project> Projects { get; set; }
public DbSet<Discipline> Disciplines { get; set; }
public DbSet<Service> Services { get; set; }
public DbSet<ServiceGroup> ServiceGroups { get; set; }
public DbSet<SizeUnit> SizeUnits { get; set; }
public DbSet<Equipment> Equipments { get; set; }
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
var entityTypes = typeof(TestDbContext).GetProperties()
.Where(p => p.PropertyType.IsGenericType && p.PropertyType.GetGenericTypeDefinition() == typeof(DbSet<>))
.Select(p => p.PropertyType.GetGenericArguments()[0]).ToList();
entityTypes.ForEach(entityType => {
var entityName = entityType.Name;
modelBuilder.Entity(entityType).ToTable(entityName);
});
modelBuilder.Entity<ServiceMapping>().HasOne(x => x.Service).WithMany().HasForeignKey(x => x.ServiceId).OnDelete(DeleteBehavior.Cascade);
modelBuilder.Entity<ServiceMapping>().HasOne(x => x.TargetService).WithMany().HasForeignKey(x => x.TargetServiceId).OnDelete(DeleteBehavior.Cascade);
base.OnModelCreating(modelBuilder);
}
}
public class ServiceGroup : EntityBase
{
public Guid ProjectId { get; set; }
public virtual Project Project { get; set; }
public Guid? ScenarioId { get; set; }
}
public class ServiceMapping : EntityBase
{
public Guid ProjectId { get; set; }
public virtual Project Project { get; set; }
public Guid ServiceId { get; set; }
public virtual Service Service { get; set; }
public Guid TargetServiceId { get; set; }
public virtual Service TargetService { get; set; }
}
public class SizeUnit : EntityBase
{
public Guid ProjectId { get; set; }
public virtual Project Project { get; set; }
public int UnitType { get; set; }
}
If I annotate Project of service entity, then it's all right.