Using a Hashtable to store only keys?

Question

Possible Duplicate:
Which collection for storing unique strings?

I am currently using a Dictionary<string, bool> to store a list of unique identifiers. These identifiers do not need to have any data associated with them - I am just using the Dictionary to be able to quickly check for duplicates.

Since I only need keys, and no values, is a Dictionary the way to go here, or is there another collection I don't know about that would be better suited?

Answer 1

.NET 3.5 includes the HashSet<T> collection type, which sounds like what you want.

Answer 2

HashSet<T>

Answer 3

You can also use a list and the Contains() method. See below:

IList<string> listToTest = new List<string>();

listToTest.Add("testforduplicate");


Console.WriteLine(listToTest.Contains("testforduplicate")); //True
Console.WriteLine(listToTest.Contains("notduplicate")); //False

For custom objects see Programing C#