Average< TSource >() [8/10]

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

inlinestatic

Definition at line 4010 of file Enumerable.cs.

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