public static decimal Product <T>(this IEnumerable <T> en, CustomTypeNumericalValue <T> numericalVal)
{
decimal product = 1;
foreach (T element in en)
{
dynamic e = element;
product = product * numericalVal(element);
}
return(product);
}
//this version is for user defined types (classes structures etc)
public static decimal Sum <T>(this IEnumerable <T> en, CustomTypeNumericalValue <T> numericalVal)
{
decimal sum = 0;
foreach (T element in en)
{
dynamic e = element;
sum = sum + numericalVal(element);
}
return(sum);
}
public static decimal Average <T>(this IEnumerable <T> en, CustomTypeNumericalValue <T> numericalVal)
{
decimal sum = 0;
int count = 0;
foreach (T element in en)
{
dynamic e = element;
sum = sum + numericalVal(element);
count++;
}
return(sum / count);
}
public static decimal Product <T>(this IEnumerable <T> collection, CustomTypeNumericalValue <T> numericalVal)
{
if (collection == null)
{
throw new ArgumentNullException("empty collection");
}
decimal sum = 1;
foreach (T element in collection)
{
sum = sum * numericalVal(element);
}
return(sum);
}
public static decimal Average <T>(this IEnumerable <T> collection, CustomTypeNumericalValue <T> numericalVal)
{
if (collection == null)
{
throw new ArgumentNullException("empty collection");
}
decimal sum = 0;
long count = 0;
foreach (T element in collection)
{
sum = sum + numericalVal(element);
count++;
}
if (count == 0)
{
throw new ArgumentOutOfRangeException("Collection contains no elements");
}
else
{
return(sum / count);
}
}
