Process completed with exit code 1.

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.

Dereference of a possibly null reference.

Possible null reference return.

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'.

Possible null reference return.

Possible null reference return.

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

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