public bool Contains(TK key) { return(_range.IsWithin(key) && _underlying.ContainsKey(key)); }
/// <summary> /// Determines whether the <see cref="T:System.Collections.Generic.IDictionary`2" /> contains an element with the specified key. /// </summary> /// <param name="key">The key to locate in the <see cref="T:System.Collections.Generic.IDictionary`2" />.</param> /// <returns> /// true if the <see cref="T:System.Collections.Generic.IDictionary`2" /> contains an element with the key; otherwise, false. /// </returns> /// <exception cref="T:System.ArgumentNullException"> /// <paramref name="key" /> is null. /// </exception> public bool ContainsKey(TK key) { return(_range.IsWithin(key) && _parent.ContainsKey(key)); }