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