/// <summary>Returns enumerable which when enumerated! resolves all default and named
/// implementations/registrations of requested service type.
/// If no services resolved when enumerable accessed, no exception is thrown - enumerable is empty.</summary>
/// <param name="serviceType">Service type to resolve.</param>
/// <returns>Returns enumerable which will return resolved service objects.</returns>
protected override IEnumerable <object> DoGetAllInstances(Type serviceType)
{
if (serviceType == null)
{
throw new ArgumentNullException(nameof(serviceType));
}
return(Container.ResolveAll(serviceType));
}