public bool Add(T item)
{
if (_wrapped.ContainsKey(item))
{
return(false);
}
_wrapped[item] = item;
return(true);
}
public bool Contains(TKey key)
{
return(_cache.ContainsKey(key) || ProgressorWhere(Check).Any());
bool Check(IGrouping <TKey, T> item)
{
return(Comparer.Equals(key, item.Key));
}
}