c# - Define: What is a HashSet? - Stack Overflow
Dec 30, 2010 · HashSet is an unordered collection containing unique elements. It has the standard collection operations Add, Remove, Contains, but since it uses a hash-based …
What's the difference between HashSet and Set? - Stack Overflow
Apr 16, 2016 · 1 HashSet is a class derived from Set interface. As a derived class of Set, the HashSet attains the properties of Set. Important and the most frequently used derived classes …
Difference between HashSet and HashMap? - Stack Overflow
Apart from the fact that HashSet does not allow duplicate values, what is the difference between HashMap and HashSet in their implementation? It's a little bit vague because both use hash …
.net - HashSet vs. List performance - Stack Overflow
It's clear that a search performance of the generic HashSet<T> class is higher than of the generic List<T> class. Just compare the hash-based key with the linear approach in the …
Concurrent HashSet<T> in .NET Framework? - Stack Overflow
Your implementation is correct. The .NET Framework does not provide a built-in concurrent hashset type, unfortunately. However, there are some workarounds. ConcurrentDictionary …
How to initialize HashSet values by construction? - Stack Overflow
Jan 11, 2010 · Yes I sometimes forget that contrary to other collections the HashSet, HashMap have a different constructor: "Constructs a new, empty set; the backing HashMap instance has …
What is the difference between HashSet<T> and List<T>?
Jun 18, 2011 · A HashSet<T> is a class designed to give you O(1) lookup for containment (i.e., does this collection contain a particular object, and tell me the answer fast). A List<T> is a …
How can `HashSet<T>.Contains` be O(1) with this implementation?
Okay, so how "search complexity in hashset is O (1)"? It's not. The worst case complexity is proportional to the number of items. It's O (1) on average.2 If all objects fall to the same …
When should I use the HashSet<T> type? - Stack Overflow
Aug 8, 2009 · HashSet<T> is a data strucutre in the .NET framework that is a capable of representing a mathematical set as an object. In this case, it uses hash codes (the …
Collection that allows only unique items in .NET?
The HashSet<T> class provides high-performance set operations. A set is a collection that contains no duplicate elements, and whose elements are in no particular order.