Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Nullability of reference types in type of 'event PropertyChangedEventHandler ObservableObject.PropertyChanged' doesn't match implicitly implemented member 'event PropertyChangedEventHandler? INotifyPropertyChanged.PropertyChanged'.

Cannot convert null literal to non-nullable reference type.

Nullability of reference types in type of parameter 'otherValueObj' of 'int NaturalSortComparable.CompareTo(object otherValueObj)' doesn't match implicitly implemented member 'int IComparable.CompareTo(object? obj)' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'other' of 'int NaturalSortComparable.CompareTo(NaturalSortComparable other)' doesn't match implicitly implemented member 'int IComparable<NaturalSortComparable>.CompareTo(NaturalSortComparable? other)' (possibly because of nullability attributes).

The default value specified for parameter 'orderDirection' will have no effect because it applies to a member that is used in contexts that do not allow optional arguments

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.