Sum< TSource >() [4/10]

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

inlinestatic

Definition at line 8026 of file Enumerable.cs.

    {
        if (source == null)
        {
            ThrowHelper.ThrowArgumentNullException(ExceptionArgument.source);
        }
        if (selector == null)
        {
            ThrowHelper.ThrowArgumentNullException(ExceptionArgument.selector);
        }
        double num = 0.0;
        foreach (TSource item in source)
        {
            double? num2 = selector(item);
            if (num2.HasValue)
            {
                num += num2.GetValueOrDefault();
            }
        }
        return num;
    }

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