/// <summary>
/// Determines whether the specified key is contained.
/// </summary>
/// <param name="key">The key.</param>
/// <returns>
/// <c>true</c> if the specified key is contained; otherwise, <c>false</c>.
/// </returns>
public bool ContainsKey(TKey key)
{
return(_wrapped.ContainsKey
(
_keyComparer.GetHashCode(key),
input =>
{
TKey foundKey;
if (PrivateTryGetValue(input, out foundKey))
{
return _keyComparer.Equals(foundKey, key);
}
return false;
}
));
}
bool ICollection <KeyValuePair <TKey, TValue> > .Contains(KeyValuePair <TKey, TValue> item)
{
// No risk of dead needles here
Predicate <WeakNeedle <TKey> > check = input =>
{
TKey foundKey;
if (PrivateTryGetValue(input, out foundKey))
{
return(_keyComparer.Equals(foundKey, item.Key));
}
return(false);
};
return(_wrapped.ContainsKey
(
_keyComparer.GetHashCode(item.Key),
check,
input => EqualityComparer <TValue> .Default.Equals(input, item.Value)
));
}