How to manually re-validate the Validations of the ValidationContext in ReactiveUI?

Question

I need to force the ValidationContext to re-validate its Validations / ValidationRules when a specific property of my ViewModel changes. I don't see any methods to trigger validation, e.g. a Validate() method. I'm using ReactiveUI.Validation framework.

Answer 1

This is the code that calls the IsValid delegate in ReactiveUI. This code can be found in class BasePropertyValidation.

    protected override IObservable<IValidationState> GetValidationChangeObservable()
    {
        Activate();
        return _valueSubject
            .Select(value => new ValidationState(_isValidFunc(value), _message(value, _isValidFunc(value))))
            .DistinctUntilChanged(new ValidationStateComparer());
    }

And this code is ONLY triggered on a change of the validated property value.

So the answer is: ReactiveUI.Validation does not provide functionality to trigger any validation without changing property values.