Re: Efficiency about hashtable, arraylist, string and synchronization

Hashtable, but not your way ;-p

The string option is bad. Don't go near it. Firstly you would need a
delimiter, but mainly because strings are immutable (and hence your code is
actually wrong). You would need sList = sList.Replace(id,""); but now you
have multiple lock objects; OK you could avoid this with a separate lock,
but you are still making *lots* of strings.

Personally I also wouldn't go near the .Synchronized options... I'd just:

lock(hList) {
hList.Add(id);
}

etc; this way you know the duration of the lock, so you can safely do
multiple steps as an atomic unit:
lock(hList) {
if(!hList.Contains(id)) {
hList.Add(id,id); // value is dummy
}
}

Note also that (assuming ID is an integer) this will involve boxing; if you
can, I would suggest moving to 2.0 and using a Dictionary<int,int>.

Marc


.

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