How to perform a distinct with a custom comparer?

Short answer: How to perform a distinct with a custom comparer? class EmployeeNameComparer : IEqualityComparer<Employee> public bool Equals(Employee x, Employee y) => x.Name == y.Name; public int GetHashCode(Employee obj) => obj.Name.GetHashCode(); var distinctByName = employees.Distinct(new EmployeeNameComparer()); foreach (var emp in distinctByName) Console.WriteLine(emp.Name); How to perform a distinct with a custom comparer?

Real-world example (ShopNest)

ShopNest uses LINQ to query orders: filter by date, project to a summary DTO, and order by total—readable C# that becomes SQL under EF Core.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.