MQL5 ReferenceStandard LibraryGeneric Data CollectionsCKeyValuePair<TKey,TValue>Key KeyValueCloneCompareEqualsHashCode Key (the Get method) Gets the key in the key/value pair. TKey Key(); Return Value Returns the key. Key (the Set method) Sets the key in the key/value pair. void Key( TKey key // key ); Parameters key [in] Key. CKeyValuePair<TKey,TValue> Value