public static decimal?Sum(this IIterable <decimal?> source)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
decimal sum = 0;
source.ForEach(
o => sum = sum + o ?? 0
);
return(sum);
}
public static long?Sum(this IIterable <long?> source)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
long sum = 0;
source.ForEach(
o => sum = checked (sum + o ?? 0)
);
return(sum);
}
public static int Sum(this IIterable <int> source)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
int sum = 0;
source.ForEach(
o => sum = checked (sum + o)
);
return(sum);
}
public static double Sum(this IIterable <double> source)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
double sum = 0;
source.ForEach(
o => sum = sum + o
);
return(sum);
}
public static TNewResult Aggregate <TSource, TAccumulate, TNewResult>(this IIterable <TSource> source, TAccumulate seed, Func <TAccumulate, TSource, TAccumulate> func, Func <TAccumulate, TNewResult> resultSelector)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (func == null)
{
throw new ArgumentNullException("func");
}
if (resultSelector == null)
{
throw new ArgumentNullException("resultSelector");
}
source.ForEach(
o => seed = func(seed, o)
);
return(resultSelector(seed));
}