private static Type GetImplType(this ServiceRegistration registration)
{
switch (registration.GetRegistryType())
{
case RegistryType.ByType: return(registration.ImplementingType);
case RegistryType.ByInstance: return(registration.Value.GetType());
case RegistryType.ByFactory: return(registration.FactoryExpression.Method.ReturnType);
default: throw new ArgumentOutOfRangeException();
}
}