public static decimal Product <T>(this IEnumerable <T> en, CustomNumberType <T> numValue)
{
decimal product = 1;
foreach (T element in en)
{
dynamic e = element;
product *= numValue(element);
}
return(product);
}
//this versions are for user defined types (classes structures etc)
public static decimal Sum <T>(this IEnumerable <T> en, CustomNumberType <T> numValue)
{
decimal sum = 0;
foreach (T element in en)
{
dynamic e = element;
sum += numValue(element);
}
return(sum);
}
public static decimal Average <T>(this IEnumerable <T> en, CustomNumberType <T> numValue)
{
decimal sum = 0;
int count = 0;
foreach (T element in en)
{
dynamic e = element;
sum += numValue(element);
count++;
}
return(sum / count);
}