C# records used as hash keys

New C# 9 feature records can easily be used as key in hash structures such as IDictionary<TKey, TValue>, thanks to them by default implementing IEquatable<>. Of course classes can be used as keys too but you either compare by reference, which is not desirable in many cases, or you need to implement IEquatable<> by yourself.

Example

public record Key 
{
    public string Title { get; init; }
    public string Batch { get; init; }
}

var distinctArticles = new HashSet<Key>();

foreach(var article in articles)
    distincArticles.Add(new Key 
    { 
        Title = article.Title, 
        Batch = article.Batch  
    });