/// <summary>
/// Registers an open generic for the given dependency type if the dependency has not yet been registered; else
/// does nothing.
/// </summary>
/// <param name="registry">The `IComponentRegistry` instance to register the mapping against.</param>
/// <param name="dependencyType">The open generic type of the dependency being registered.</param>
/// <param name="implementationType">The open generic type of the implementation that should be resolved.</param>
/// <param name="lifestyle">The lifestyle of the component.</param>
public static IComponentRegistry AttemptRegisterGeneric(this IComponentRegistry registry, Type dependencyType,
Type implementationType, Lifestyle lifestyle)
{
Guard.AgainstNull(registry, nameof(registry));
if (registry.IsRegistered(dependencyType))
{
return(registry);
}
registry.RegisterGeneric(dependencyType, implementationType, lifestyle);
return(registry);
}