Average< TSource >() [4/10]

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

inlinestatic

Definition at line 4202 of file Enumerable.cs.

    {
        if (source == null)
        {
            ThrowHelper.ThrowArgumentNullException(ExceptionArgument.source);
        }
        if (selector == null)
        {
            ThrowHelper.ThrowArgumentNullException(ExceptionArgument.selector);
        }
        using (IEnumerator<TSource> enumerator = source.GetEnumerator())
        {
            while (enumerator.MoveNext())
            {
                double? num = selector(enumerator.Current);
                if (!num.HasValue)
                {
                    continue;
                }
                double num2 = num.GetValueOrDefault();
                long num3 = 1L;
                while (enumerator.MoveNext())
                {
                    num = selector(enumerator.Current);
                    if (num.HasValue)
                    {
                        num2 += num.GetValueOrDefault();
                        num3 = checked(num3 + 1);
                    }
                }
                return num2 / (double)num3;
            }
        }
        return null;
    }

References System.Collections.Generic.Dictionary< TKey, TValue >.GetEnumerator(), System.L, System.Linq.selector, System.Linq.source, and System.Linq.ThrowHelper.ThrowArgumentNullException().