sentry measure IEnumerator

enumerator-measure.cs

// measure enumeration:
//Where each enumeration is a result of a potentially coslty operation such as a DB cursor read
                foreach (var group in groups.Measure())
                {
                    // work
                }



//Code:
    static class MeasureEnumerableExtensions
    {
        public static IEnumerable<IList<string>> Measure(this IEnumerable<IList<string>> enumerable)
            => new MeasureEnumerable(enumerable);
    }
    class MeasureEnumerable : IEnumerable<IList<string>>
    {
        private readonly IEnumerable<IList<string>> _inner;

        public MeasureEnumerable(IEnumerable<IList<string>> inner) => _inner = inner;

        public IEnumerator<IList<string>> GetEnumerator() => new MeasureEnumerator(_inner.GetEnumerator());

        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();

        class MeasureEnumerator : IEnumerator<IList<string>>
        {
            private readonly IEnumerator<IList<string>> _inner;

            public MeasureEnumerator(IEnumerator<IList<string>> inner)
            {
                _inner = inner;
            }
            public bool MoveNext()
            {
                var next = SentrySdk.GetSpan()?.StartChild("MoveNext");
                var result = _inner.MoveNext();
                next?.SetExtra("result", result.ToString());
                next?.Finish();
                return result;
            }

            public void Reset() => _inner.Reset();

            public IList<string> Current => _inner.Current;

            object IEnumerator.Current => Current;

            public void Dispose() => _inner.Dispose();
        }
    }