HashSetTKey, TValueTryGetItem - метод

public bool TryGetItem(
	TKey key,
	out TValue item
)

Public Function TryGetItem ( 
	key As TKey,
	<OutAttribute> ByRef item As TValue
) As Boolean

public:
bool TryGetItem(
	TKey key, 
	[OutAttribute] TValue% item
)

member TryGetItem : 
        key : 'TKey * 
        item : 'TValue byref -> bool