public AndSpecification(Specification <T> left, Specification <T> right) { _right = right; _left = left; }
public NotSpecification(Specification <T> specification) { _specification = specification; }
public AndSpecification(Specification <T> left, Specification <T> right) { _right = right; _left = left; }
public NotSpecification(Specification <T> specification) { _specification = specification; }