Sum< TSource >() [10/10]

static ? long System.Linq.Enumerable.Sum< TSource > ( this IEnumerable< TSource > source, Func< TSource, long?> selector )

inlinestatic

Definition at line 7946 of file Enumerable.cs.

    {
        if (source == null)
        {
            ThrowHelper.ThrowArgumentNullException(ExceptionArgument.source);
        }
        if (selector == null)
        {
            ThrowHelper.ThrowArgumentNullException(ExceptionArgument.selector);
        }
        long num = 0L;
        foreach (TSource item in source)
        {
            long? num2 = selector(item);
            if (num2.HasValue)
            {
                num = checked(num + num2.GetValueOrDefault());
            }
        }
        return num;
    }

References System.item, System.L, System.Linq.selector, System.Linq.source, and System.Linq.ThrowHelper.ThrowArgumentNullException().