Adding new Entity generates negative id - .net-core

Question

I'm trying to add a new Container entity, but when I add the entity, I'm getting a negative Id being displayed in the resulting dataset. However, inside of my SQL database, I end up getting the correct next Id of the Container that was just inserted.
I've looked around, and I can see where this same issue occurs if you were to Update the entity before adding it - but I can't quite see anything related to the error occuring when you're first Adding the entity.
I'm literally just passing a new'ed up Container object, and adding it to the Containers DbSet on the ProductContext.
public class ProductService : IProductService
public ProductService(IProductContext productContext)
{
_productContext = productContext;
}
public Container CreateContainer(Container container, int currentUserId)
{
_productContext.Containers.Add(container);
_productContext.SaveChangesAsync();
return container;
}
}
However, when stepping through, I can see that I start off with a zero'd out Id...
And after the save is processed, the container has an Id of -2147482645.
But if I check the database, I end up with the correct next value after it's been saved. However, this value does not update on the entity, instead it stays as the -2147482645 value.
Here's my Container entity...
public class Container : BaseEntity
{
public Container()
{
this.ChildContainers = new HashSet<Container>();
this.InventoryItems = new HashSet<InventoryItem>();
}
public ICollection<Container> ChildContainers { get; set; }
public ICollection<InventoryItem> InventoryItems { get; set; }
public Location Location { get; set; }
public int? LocationId { get; set; }
public string Name { get; set; }
[ForeignKey("ParentContainerId ")]
public Container ParentContainer { get; set; }
public int? ParentContainerId { get; set; }
}
and the value of the BaseEntity class
public abstract class BaseEntity
{
[Key]
public virtual int Id { get; set; }
[DefaultValue(false)]
public virtual bool IsDeleted { get; set; }
protected virtual object Actual => this;
public override bool Equals(object obj)
{
if (!(obj is BaseEntity other))
return false;
if (ReferenceEquals(this, other))
return true;
if (Actual.GetType() != other.Actual.GetType())
return false;
if (Id == 0 || other.Id == 0)
return false;
return Id == other.Id;
}
public static bool operator ==(BaseEntity a, BaseEntity b)
{
if (a is null && b is null)
return true;
if (a is null || b is null)
return false;
return a.Equals(b);
}
public static bool operator !=(BaseEntity a, BaseEntity b)
{
return !(a == b);
}
public override int GetHashCode()
{
return (Actual.GetType().ToString() + Id).GetHashCode();
}
public DateTime CreatedDate { get; set; }
public DateTime UpdatedDate { get; set; }
}
And the implementation of my SaveChangesAsync method - however, I don't believe this really could affect it, as the Id is getting updated before it hits this point.
public override async Task<int> SaveChangesAsync(CancellationToken cancellationToken = new CancellationToken())
{
var entries = ChangeTracker
.Entries()
.Where(e => e.Entity is BaseEntity && (
e.State == EntityState.Added
|| e.State == EntityState.Modified));
foreach (var entityEntry in entries)
{
((BaseEntity)entityEntry.Entity).UpdatedDate = DateTime.Now;
if (entityEntry.State == EntityState.Added)
{
((BaseEntity)entityEntry.Entity).CreatedDate = DateTime.Now;
}
}
return await base.SaveChangesAsync();
}
EDIT 1: SaveChanges syncronously
It was mentioned that the SaveChanges could affect it as I was running the asynchronous version of the method in a synchronous way. I don't believe this would be causing the error, as the Id is getting set/updated inside the Add method.