Create such a ViewModel
public class MainPageViewModel : INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; private readonly IMainPage _mainPage; //ctor public MainPageViewModel(IMainPage mainPage) { _mainPage = mainPage ?? throw new ArgumentNullException(nameof(mainPage)); } /// <summary> /// Содержимое комбобокса /// </summary> public List<string> StatusList { get; set; } = new List<string> { "Active", "Inactive" }; /// <summary> /// Индекс выбранного в комбобоксе /// </summary> private int _SelectedIndexStatus; public int SelectedIndexStatus { get { return _SelectedIndexStatus; } set { _SelectedIndexStatus = value; PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(SelectedIndexStatus))); } } /// <summary> /// Кнопка ОК /// </summary> public DelegateCommand ButtonOKCommand => new DelegateCommand(OnButtonOK); private void OnButtonOK() { _mainPage.ShowMessage($"Вы выбрали: {StatusList[SelectedIndexStatus]}"); } }
Such a codebeehind
public interface IMainPage { void ShowMessage(string message); } /// <summary> /// An empty page that can be used on its own or navigated to within a Frame. /// </summary> public sealed partial class MainPage : Page, IMainPage { public MainPage() { this.InitializeComponent(); //привязка ViewModel var vm = new MainPageViewModel(this); this.DataContext = vm; } public async void ShowMessage(string message) { var messageDialog = new MessageDialog(message); await messageDialog.ShowAsync(); } }
Xaml such
<ComboBox HorizontalAlignment="Left" Margin="100,0,0,0" Grid.Row="1" VerticalAlignment="Center" Width="152" ItemsSource="{Binding StatusList}" SelectedIndex="{Binding SelectedIndexStatus, Mode=TwoWay}"/> <Button Content="OK" Margin="100,0,0,0" Grid.Row="2" VerticalAlignment="Center" Command="{Binding ButtonOKCommand, Mode=OneTime}"/>
