public MainViewModel() { MapperFactory.RegisterBsonMapper(); var databaseService = new LiteDbRepository(new(typeof(EditModel), nameof(EditModel.Id))); var mapper = MapperFactory.CreateMapperConfiguration().CreateMapper(); if (databaseService.FindBy(new FirstOrDefaultQuery()) is { } editModel) { EditViewModel = mapper.Map <EditViewModel>(editModel); } EditViewModel .Changes(startWithSource: true) .Subscribe(a => { EditModel = mapper.Map <EditModel>(a.source); databaseService.Upsert(EditModel); String = UtilityHelperEx.JsonHelper.Serialize(EditModel); this.RaisePropertyChanged(new(nameof(EditModel))); this.RaisePropertyChanged(new(nameof(String))); }); }