प्रिज्म डेवलपर की गाइड - भाग 6, उन्नत एमवीवीएम लिपियों

, , PopupChildWindowAction , . Notification NotificationChildWindow , Confirmation – ConfirmationChildWindow . NotificationChildWindow , , ConfirmationChildWindow OK Cancel, . , , ChildWindow PopupChildWindowAction .

<i:Interaction.Triggers>
    <prism:InteractionRequestTrigger
            SourceObject="{Binding ConfirmCancelInteractionRequest}">
        <prism:PopupChildWindowAction
                  ContentTemplate="{StaticResource ConfirmWindowTemplate}"/>
    </prism:InteractionRequestTrigger>
</i:Interaction.Triggers>

<UserControl.Resources>
    <DataTemplate x:Key="ConfirmWindowTemplate">
        <Grid MinWidth="250" MinHeight="100">
            <TextBlock TextWrapping="Wrap" Grid.Row="0" Text="{Binding}"/>
        </Grid>
    </DataTemplate>
</UserControl.Resources>

ContentTemplate , UI Content . Content , , TextBlock Content .

, MEF

[Import]
public QuestionnaireViewModel ViewModel {
    set { this.DataContext = value; }
}

[Export]
public class QuestionnaireViewModel : NotificationObject {
    ...
}

public QuestionnaireView() {
     InitializeComponent();
}
[ImportingConstructor]
public QuestionnaireView(QuestionnaireViewModel viewModel) : this() {
    this.DataContext = viewModel;
}

MEF, Unity. , , . , Visual Studio Expression Blend, , , . , , , , InitializeComponent .

, Unity

public QuestionnaireView() {
    InitializeComponent();
}
public QuestionnaireView(QuestionnaireViewModel viewModel) : this() {
    this.DataContext = viewModel;
}

, , Visual Studio Expression Blend.

public QuestionnaireView() {
    InitializeComponent();
}

[Dependency]
public QuestionnaireViewModel ViewModel {
    set { this.DataContext = value; }
}

container.RegisterType<QuestionnaireViewModel>();

var view = container.Resolve<QuestionnaireView>();

,

private void NavigateToQuestionnaireList() {
    //     "questionnaire list".
    this.uiService.ShowView(ViewNames.QuestionnaireTemplatesList);
}

public void ShowView(string viewName) {
    var view = this.ViewFactory.GetView(viewName);
    this.MainWindow.CurrentView = view;
}

Prism . , , , . , , "View-Based Navigation" 8, "Navigation".

MVVM

INotifyPropertyChanged

var changeTracker = new PropertyChangeTracker(viewModel);
viewModel.CurrentState = "newState";
CollectionAssert.Contains(changeTracker.ChangedProperties, "CurrentState");

var changeTracker = new PropertyChangeTracker(viewModel);

var question = viewModel.Questions.First() as OpenQuestionViewModel;
question.Question.Response = "some text";

CollectionAssert.Contains(changeTracker.ChangedProperties, "UnansweredQuestions");

INotifyDataErrorInfo

//  .
var notifyErrorInfo = (INotifyDataErrorInfo)question;
question.Response = -15;
Assert.IsTrue(notifyErrorInfo.GetErrors("Response").Cast<ValidationResult>().Any());
//  .
var notifyErrorInfo = (INotifyDataErrorInfo)question;
question.Response = 15;
Assert.IsFalse(notifyErrorInfo.GetErrors("Response").Cast<ValidationResult>().Any());

INotifyDataErrorInfo

• HasErrors . , .
• ErrorsChanged , , GetErrors . ( , ) , . GetErrors ErrorsChanged .

var helper =
    new NotifyDataErrorInfoTestHelper<NumericQuestion, int?>(
        question,
        q => q.Response);

helper.ValidatePropertyChange(
    6,
    NotifyDataErrorInfoBehavior.Nothing);
helper.ValidatePropertyChange(
    20,
    NotifyDataErrorInfoBehavior.FiresErrorsChanged
    | NotifyDataErrorInfoBehavior.HasErrors
    | NotifyDataErrorInfoBehavior.HasErrorsForProperty);
helper.ValidatePropertyChange(
    null,
    NotifyDataErrorInfoBehavior.FiresErrorsChanged
    | NotifyDataErrorInfoBehavior.HasErrors
    | NotifyDataErrorInfoBehavior.HasErrorsForProperty);
helper.ValidatePropertyChange(
    2,
    NotifyDataErrorInfoBehavior.FiresErrorsChanged);

questionnaireRepositoryMock
    .Setup(
        r =>
            r.SubmitQuestionnaireAsync(
                It.IsAny<Questionnaire>(),
                It.IsAny<Action<IOperationResult>>()))
    .Callback<Questionnaire, Action<IOperationResult>>(
        (q, a) => callback = a);

uiServicemock
    .Setup(svc => svc.ShowView(ViewNames.QuestionnaireTemplatesList))
    .Callback<string>(viewName => requestedViewName = viewName);
submitResultMock
    .Setup(sr => sr.Error)
    .Returns<Exception>(null);

CompleteQuestionnaire(viewModel);
viewModel.Submit();
//      UI .
callback(submitResultMock.Object);
//    –     .
Assert.AreEqual(ViewNames.QuestionnaireTemplatesList, requestedViewName);

, .