internal DirectionalRelationship(EntityKey toEntityKey, AssociationEndMember fromEnd, AssociationEndMember toEnd, AssociationSet associationSet, IEntityStateEntry stateEntry) { ToEntityKey = EntityUtil.CheckArgumentNull(toEntityKey, "toEntityKey"); FromEnd = EntityUtil.CheckArgumentNull(fromEnd, "fromEnd"); ToEnd = EntityUtil.CheckArgumentNull(toEnd, "toEnd"); AssociationSet = EntityUtil.CheckArgumentNull(associationSet, "associationSet"); StateEntry = EntityUtil.CheckArgumentNull(stateEntry, "stateEntry"); _equivalenceSetLinkedListNext = this; _hashCode = toEntityKey.GetHashCode() ^ fromEnd.GetHashCode() ^ toEnd.GetHashCode() ^ associationSet.GetHashCode(); }