public MyViewModel(MyModel model)
{
_model = model;
_myProperty = new Computed <string>(() => _model.MyModelProperty);
_myPropertySubscription = _myProperty.Subscribe(_ =>
NotifyOfPropertyChange(() => MyProperty));
}
public PropertyValidator(string propertyName, Func <object> function, Action <string> notify)
{
PropertyName = propertyName;
_validationErrors = new Computed <List <string> >(() =>
{
var value = function();
return(_rules.Select(r => r(value)).Where(e => e != null).ToList());
});
_subscription = _validationErrors.Subscribe((errors, priorErrors) =>
{
if (priorErrors == null)
{
if (errors != null && errors.Any())
{
notify(propertyName);
}
}
else
{
if (errors == null || !priorErrors.SequenceEqual(errors))
{
notify(propertyName);
}
}
});
}
