Nullability of reference types in type of parameter 'parameter' of 'bool Command.CanExecute(object parameter)' doesn't match implicitly implemented member 'bool ICommand.CanExecute(object? parameter)' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'parameter' of 'void Command.Execute(object parameter)' doesn't match implicitly implemented member 'void ICommand.Execute(object? parameter)' (possibly because of nullability attributes).

Non-nullable property 'MonthRadarChartDayFromText' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'WeekLineChart' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'MonthRadarChart' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'AverageMoodPointChart' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Dereference of a possibly null reference.

Non-nullable event 'OnFilterApplyFilter' must contain a non-null value when exiting constructor. Consider declaring the event as nullable.

Non-nullable field '_labels' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.