Using Custom Generic Collection faster with objects than List

Question

I'm iterating through a List<> to find a matching element. The problem is that object has only 2 significant values, Name and Link (both strings), but has some other values which I don't want to compare.

I'm thinking about using something like HashSet (which is exactly what I'm searching for -- fast) from .NET 3.5 but target framework has to be 2.0. There is something called Power Collections here: http://powercollections.codeplex.com/ , should I use that?

But maybe there is other way? If not, can you suggest me a suitable custom collection?

Answer 1

In .NET 2.0 instead of a HashSet<T> you can use a Dictionary<K, V> .

Dictionary uses the hash code to perform key lookups so it has similar performace to the HashSet . There are at least two approaches:

• Create a custom class or struct containing the Name and Link and use that as the key in the dictionary, and put the object as the value.
• Store the entire object as the key and provide a custom equality comparer that only looks at the Name and Link member, and set the value to null.

The second method is very similar to how you would use a HashSet if it were available.

Answer 2

How about this:

Custom class/collection wich will held List of objects and two dictionaries, one for the name and one for the link. Both of them will have a int value wich will be the index of object. I think that in that case I will only need to check if there is such int value of name dictionary that equals link dictionary int.

Is this a good approach?