IdMappingItem Property

public IdPair this[
        ObjectId key
] { get; set; }

Public Default Property Item ( 
        key As ObjectId
) As IdPair
        Get
        Set

public:
property IdPair default[ObjectId key] {
        IdPair get (ObjectId key);
        void set (ObjectId key, IdPair value);
}

member Item : IdPair with get, set