public ModelObservableValidation(TViewModel model, Func <TViewModel, IObservable <bool> > validityObservable, Func <TViewModel, bool, ValidationText> messageFunc)
{
_disposables.Add(_lastValidationStateSubject.Do(s =>
{
_isValid = s.IsValid;
_text = s.Text;
}).Subscribe());
_validityConnectedObservable = Observable.Defer(() => validityObservable(model)).
Select(v => new ValidationState(v, messageFunc(model, v), this)).
Multicast(_lastValidationStateSubject);
}
/// <summary>
/// Initializes a new instance of the <see cref="ObservableValidationBase{TViewModel, TValue}"/> class.
/// </summary>
/// <param name="observable">Observable that updates the view model property validity.</param>
protected ObservableValidationBase(IObservable <IValidationState> observable)
{
_isValidSubject
.Do(state =>
{
_isValid = state.IsValid;
_text = state.Text;
})
.Subscribe()
.DisposeWith(_disposables);
_validityConnectedObservable = Observable
.Defer(() => observable)
.Multicast(_isValidSubject);
}
/// <summary>
/// Initializes a new instance of the <see cref="ModelObservableValidationBase{TViewModel}"/> class.
/// </summary>
/// <param name="viewModel">ViewModel instance.</param>
/// <param name="validityObservable">Func to define if the viewModel is valid or not.</param>
/// <param name="messageFunc">Func to define the validation error message based on the viewModel and validityObservable values.</param>
protected ModelObservableValidationBase(
TViewModel viewModel,
Func <TViewModel, IObservable <bool> > validityObservable,
Func <TViewModel, bool, ValidationText> messageFunc)
{
_lastValidationStateSubject
.Do(state =>
{
_isValid = state.IsValid;
_text = state.Text;
})
.Subscribe()
.DisposeWith(_disposables);
_validityConnectedObservable = Observable
.Defer(() => validityObservable(viewModel))
.Select(v => new ValidationState(v, messageFunc(viewModel, v), this))
.Multicast(_lastValidationStateSubject);
}