OK, i found the solution:
[Serializable]
public class SerializableHashSet<T> : HashSet<T>
{
[JsonConstructor]
public SerializableHashSet(IEnumerable<T> collection) : base(collection) {}
}
OK, i found the solution:
[Serializable]
public class SerializableHashSet<T> : HashSet<T>
{
[JsonConstructor]
public SerializableHashSet(IEnumerable<T> collection) : base(collection) {}
}