.net - Why does HashSet<T> not implement ICollection? -


i going write library traverse object graph (like kind of serialization).
need judge if object collection in traverse, icollection came out of mind. (string has implemented ienumerable)

but weird containers in collections have implemented icollection except hashset implemented icollection<t>...

i have checked out common containers in system.collections namespace: 

arraylist : ilist, icollection, ienumerable, icloneable   bitarray : icollection, ienumerable, icloneable   hashtable : idictionary, icollection, ienumerable, iserializable, ideserializationcallback, icloneable   queue : icollection, ienumerable, icloneable   sortedlist : idictionary, icollection, ienumerable, icloneable   stack : icollection, ienumerable, icloneable   dictionary<tkey, tvalue> : idictionary<tkey, tvalue>, icollection<keyvaluepair<tkey, tvalue>>, idictionary, icollection, ireadonlydictionary<tkey, tvalue>, ireadonlycollection<keyvaluepair<tkey, tvalue>>, ienumerable<keyvaluepair<tkey, tvalue>>, ienumerable, iserializable, ideserializationcallback hashset<t> : iserializable, ideserializationcallback, iset<t>, icollection<t>, ienumerable<t>, ienumerable   linkedlist<t> : icollection<t>, ienumerable<t>, icollection, ienumerable, iserializable, ideserializationcallback   list<t> : ilist<t>, icollection<t>, ilist, icollection, ireadonlylist<t>, ireadonlycollection<t>, ienumerable<t>, ienumerable   queue<t> : ienumerable<t>, icollection, ienumerable   sorteddictionary<tkey, tvalue> : idictionary<tkey, tvalue>, icollection<keyvaluepair<tkey, tvalue>>, ienumerable<keyvaluepair<tkey, tvalue>>, idictionary, icollection, ienumerable   sortedlist<tkey, tvalue> : idictionary<tkey, tvalue>, icollection<keyvaluepair<tkey, tvalue>>, ienumerable<keyvaluepair<tkey, tvalue>>, idictionary, icollection, ienumerable   sortedset<t> : iset<t>, icollection<t>, ienumerable<t>, icollection, ienumerable, iserializable, ideserializationcallback   stack<t> : ienumerable<t>, icollection, ienumerable

is bug? or there reason behind?


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