public static ObservableNullableDoubleAverage Create(INotifyEnumerable <double?> source)
{
var observable = new ObservableNullableDoubleAverage(source);
observable.Successors.SetDummy();
return(observable);
}
public static INotifyValue <double?> CreateNullableDouble <TSource>(this INotifyEnumerable <TSource> source, Expression <Func <TSource, double?> > predicate)
{
return(ObservableNullableDoubleAverage.Create(source.Select(predicate)));
}