public class BJsonEnumerable<T> : IEnumerator<T>, IEnumerable<T> where T : class
    {
        public IEnumerator<T> GetEnumerator()
        {
            if (check) new BJsonEnumerable<T>(this.bsonData, this.maxOffset);
            return this;
        }


        ILiteQueryable<T> bsonData;
        IBsonDataReader bsonDataReader;
        bool check;
        public BJsonEnumerable(ILiteQueryable<T> bsonData, int maxOffset = 10000)
        {
            this.bsonData = bsonData;
            check = false;
            this.maxOffset = maxOffset;
        }
        public void Begin()
        {
            bsonDataReader = bsonData.Offset(this.offset).ExecuteReader();

        }

        int offset = 0;
        int abstract_offset = 0;
        int maxOffset;
        public T Current { get { return current; } set { current = value; } }
        private T current;

        object IEnumerator.Current { get { return current; } }


        public void Dispose()
        {
            this.current = null;
            this.bsonDataReader = null;

        }

        public bool MoveNext()
        {

            this.check = true;
            if (bsonDataReader == null) Reset();
            bool read = bsonDataReader.Read();
            if (read == false)
            {
                this.current = default;
                return false;
            }
            var bJson = bsonDataReader.Current ;

            string json = bJson.ToString();
            bJson.RawValue = null;

            this.current = JsonConvert.DeserializeObject<T>(json);
            offset++;
            abstract_offset++;
            //if (abstract_offset > maxOffset)
            //{
            //    abstract_offset = 0;
            //    bsonDataReader.Dispose();
            //    Begin();
            //}
            return read;
        }

        public void Reset()
        {
            this.current = null;
            if (this.bsonDataReader == null) Begin();

        }

        IEnumerator IEnumerable.GetEnumerator()
        {
            if (check) new BJsonEnumerable<T>(this.bsonData, this.maxOffset);
            return this;
        }
    }