CreateInstance inside Extension Method not allowed? - entity-framework-core

Question

I'm trying to convert my IQueryable<TEntity> results to IEnumerable<TDomainModel> via an extension method.
IEnumerable<DeviceModel> resultEntities = _unitofwork.PersonDeviceRepository
.GetUnassociatedDevices()
.AddFilters(deviceByTypeQueryObject.AsExpression())
.ToDomainModels<DeviceModel,Device>();
The IQueryable Extension is:
public static IEnumerable<TDomainModel> ToDomainModels<TDomainModel, TEntity>(this IQueryable<TEntity> queryableEntities)
{
IEnumerable<TDomainModel> domainModels =
queryableEntities
.Select(indiv => (TDomainModel)Activator.CreateInstance(typeof(TDomainModel), indiv));
return domainModels;
}
It compiles but errors in runtime:
System.InvalidOperationException: The client projection contains a reference to a constant expression of 'System.RuntimeType' which is being passed as an argument to the method 'CreateInstance'.
But it works if the Activator.CreateInstance conversion is NOT done in as part of an extension method. ie: in a regular method
Why is this happening?

Answer 1

Found the issue:
I was feeding an IQueryable to the Extension method, but it doesn't work. It had nothing to do with the CreateInstance.
It worked after first converting the IQueryable to AsEnumerable, then fed it to the ToDomainModel extension method.
IEnumerable<DeviceModel> resultEntities = _unitofwork.PersonDeviceRepository.GetUnassociatedDevices().AddFilters(deviceByTypeQueryObject.AsExpression()).AsEnumerable().ToDomainModels<Device,DeviceModel>();
The extension method was rewritten for IEnumerable instead of IQueryable
public static IEnumerable<TDomainModel> ToDomainModels<TEntity, TDomainModel>(this IEnumerable<TEntity> enumerableEntities)
{
IEnumerable<TDomainModel> domainModels = queryableEntities.Select(indiv => (TDomainModel)Activator.CreateInstance(typeof(TDomainModel), indiv));
return domainModels;
}