public bool AddIfNotExists([NotNull] T item) { if (item is null) { ExceptionThrower.ThrowArgumentNullException(nameof(item)); } return(Extensions.AddIfNotExists(this, item)); }
public bool AddIfNotExists([NotNull] T item) { if (item is null) { ExceptionThrower.ThrowArgumentNullException(nameof(item)); } return(Extensions.AddIfNotExists(this, item)); }