public static IObservable <ValidationErrorEventArgs> ObserveValidationErrors(this INotifyValidationError validable, string property)
{
if (validable == null)
{
throw new ArgumentNullException("validable");
}
if (property == null)
{
throw new ArgumentNullException("property");
}
return(Observable.FromEventPattern <EventHandler <ValidationErrorEventArgs>, ValidationErrorEventArgs>(
o => validable.ErrorsChanged += o,
o => validable.ErrorsChanged -= o)
.Where(c => property == c.EventArgs.PropertyName)
.Select(c => c.EventArgs));
}
public static Task <bool> HasError <T>(this INotifyValidationError validable, Expression <Func <T> > property)
{
return(validable.HasErrorAsync(property.GetPropertyName()));
}
public static IObservable <ValidationErrorEventArgs> ObserveValidationErrors <T>(this INotifyValidationError validable, Expression <Func <T> > property)
{
return(validable.ObserveValidationErrors(property.GetPropertyName()));
}
