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The target framework 'net5.0-windows' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy.

Possible null reference return.

Dereference of a possibly null reference.

The annotation for nullable reference types should only be used in code within a '#nullable' annotations context.

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

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

Non-nullable event 'FilterChanged' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the event as nullable.

Nullability of reference types in type of parameter 'sender' of 'void FilterWindow.SearchParameterControl_DeleteLogic(object sender, int id)' doesn't match the target delegate 'EventHandler<int>' (possibly because of nullability attributes).

Non-nullable event 'DeleteLogic' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the event as nullable.

Non-nullable event 'DeleteLogic' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the event as nullable.