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Is there any data structure in C# that is like a dictionary but that only has a key and doesn’t have a value. I basically want a list of integers that I can quickly lookup and see if a certain value is in the list. Granted, for my current use, a List would not cause any performance problem, but it just doesn’t seem to fit well with the intent of what my code is doing.
Yes, it’s called a
HashSet<T>, and available in version 3.5 of the .NET framework. If you use .NET version 2.0, you can use a Dictionary and set values to null.