HashSet in C#

HashSet in C# — a practical guide to C# HashSet with clear examples you can reuse in real projects.

C# Tutorial Series (76/121). Prefer one article? Read the complete C# tutorial.

Short description

Great for dedupe and membership tests.

HashSet

var set = new HashSet<int> { 1, 2, 2 };
Console.WriteLine(set.Count); // 2