MQL5 ReferenceStandard LibraryGeneric Data CollectionsCSortedMap<TKey, TValue>ContainsKey AddCountComparerContainsContainsKeyContainsValueCopyToClearRemoveTryGetValueTrySetValue ContainsKey Determines whether the sorted hash table contains the key/value table with the specified key. bool ContainsKey( TKey key // key ); Parameters key [in] Key. Return Value Returns true, if the sorted hash table contains the key/value pair with the specified key, or false otherwise. Contains ContainsValue