Possible null reference assignment.

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

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

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

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

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

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

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

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