TMultiMapBase<TKey,TValue>.ContainsKey(TKey) Method
Determines whether the IMap<TKey, TValue> contains an element with the specified key.
public
 function ContainsKey(const key: TKey): Boolean; override;
Parameters
- key
- Type: TKeyThe key to locate in the IMap<TKey, TValue>. 
Return Value
Type:  Boolean
      
True if the IMap<TKey, TValue> contains an element with the key; otherwise, False.