How to use HashSet in C#
A HashSet is an optimized collection of unordered, unique elements that provides fast lookups and high-performance set operations. The HashSet class was first introduced in .NET 3.5 and is part of the System.Collection.Generic namespace. This article talks about how we can work with HashSets in C#.
To work with the code examples provided in this article, you should have Visual Studio 2019 installed in your system. If you don’t already have a copy, you can download Visual Studio 2019 here.
Create a .NET Core console application project in Visual Studio
First off, let’s create a .NET Core Console Application project in Visual Studio. Assuming Visual Studio 2019 is installed in your system, follow the steps outlined below to create a new .NET Core Console Application project in Visual Studio.