public bool Contains(KeyValuePair <T, T1> item) => dictionary.Contains(item);
public bool Contains(KeyValuePair <TKey, TValue> item) { return(_Self.Contains(item) || _Parent.Contains(item)); }
public bool Contains(KeyValuePair <T, T1> item) => dictionary.Contains(item);
public bool Contains(KeyValuePair <TKey, TValue> item) { return(_Self.Contains(item) || _Parent.Contains(item)); }