ISet basic sample

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Simple introduction for ISet

Person.cs

using System.ComponentModel;
#pragma warning disable CA1067

namespace YourNamespace.Models;

public class Person : INotifyPropertyChanged, IEquatable<Person>
{
    private int _id;
    private string _firstName;
    private string _lastName;
    private DateOnly _birthDate;

    public int Id
    {
        get => _id;
        set
        {
            if (value == _id) return;
            _id = value;
            OnPropertyChanged(nameof(Id));
        }
    }

    public string FirstName
    {
        get => _firstName;
        set
        {
            if (value == _firstName) return;
            _firstName = value;
            OnPropertyChanged(nameof(FirstName));
        }
    }

    public string LastName
    {
        get => _lastName;
        set
        {
            if (value == _lastName) return;
            _lastName = value;
            OnPropertyChanged(nameof(LastName));
        }
    }

    public DateOnly BirthDate
    {
        get => _birthDate;
        set
        {
            if (value.Equals(_birthDate)) return;
            _birthDate = value;
            OnPropertyChanged(nameof(BirthDate));
        }
    }

    public bool Equals(Person compareTo) 
        => (FirstName == compareTo.FirstName && 
            LastName == compareTo.LastName && 
            BirthDate == compareTo.BirthDate);

    public override int GetHashCode() 
        => HashCode.Combine(FirstName, LastName, BirthDate);

    public event PropertyChangedEventHandler? PropertyChanged;

    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
    public override string ToString() => $"{FirstName,-12}{LastName}";
}

Program.cs

namespace YourNamespace;

internal partial class Program
{
    static void Main(string[] args)
    {
        var frozenSet = FrozenPeople();
        foreach (var person in frozenSet)
            Console.WriteLine(person);
    }

    private static FrozenSet<Person> FrozenPeople()
    {
        
        ISet<Person> peopleSet = new HashSet<Person>([
            new() { Id = 1, FirstName = "Karen", LastName = "Payne", BirthDate = new DateOnly(1956,9,24)},
            new() { Id = 2, FirstName = "Sam", LastName = "Smith", BirthDate = new DateOnly(1976,3,4) },
            new() { Id = 1, FirstName = "Karen", LastName = "Payne", BirthDate = new DateOnly(1956,9,24) }
        ]);

        peopleSet.UnionWith([
            new() { Id = 1, FirstName = "Karen", LastName = "Payne", BirthDate = new DateOnly(1956,9,24)},
            new() { Id = 2, FirstName = "Sam", LastName = "Smith", BirthDate = new DateOnly(1976,3,4) },
            new() { Id = 3, FirstName = "Frank", LastName = "Adams", BirthDate = new DateOnly(1966,3,4) },
            new() { Id = 1, FirstName = "Karen", LastName = "Payne", BirthDate = new DateOnly(1956,9,24) }
        ]);

        peopleSet.ExceptWith([
            new() { Id = 2, FirstName = "Sam", LastName = "Smith", BirthDate = new DateOnly(1976,3,4) },
            new() { Id = 3, FirstName = "Frank", LastName = "Adams", BirthDate = new DateOnly(1966,3,4) },
        ]);

        return peopleSet.ToFrozenSet();
    }


}