Marten.Events.Projections.Async.Fetcher.getLong C# (CSharp) Method

        private async Task<long> getLong(DbDataReader reader)
        {
            await reader.NextResultAsync(_token).ConfigureAwait(false);
            bool isAny = await reader.ReadAsync(_token).ConfigureAwait(false);

            if (!isAny) return 0;

            if (await reader.IsDBNullAsync(0, _token).ConfigureAwait(false))
            {
                return 0;
            }

            return await reader.GetFieldValueAsync<long>(0, _token).ConfigureAwait(false);
        }