C# mongodb 简单自增排序 以及批量去重批量入库

//取自动排序大小

private Int64 SeqInt(int size)
{
var jobs = db.GetCollection<BsonDocument>("Counters");
var query = Query.And(Query.EQ("_id", "TaoBaoItem"));
var sortBy = SortBy.Descending("next");
var update = Update.Inc("next", (Int64)size);//.Push("new", true).Push("upsert", true);
var result = jobs.FindAndModify(query, sortBy, update, true, true);
BsonDocument chosenJob = result.ModifiedDocument;
return chosenJob.GetValue("next").AsInt64;
}

/// <summary>
/// 批量查找存在的数据
/// </summary>
/// <param name="cacheitems"></param>
/// <returns></returns>
private MongoCursor<TaoBaoItem> QueryItems(List<TaoBaoItem> cacheitems)
{
Stopwatch sw = new Stopwatch();
sw.Start();
BsonArray dd;
dd = new BsonArray();
//批量插询
foreach (var item in cacheitems)
{
dd.Add(item.Iid);
}
var query = Query.In("Iid", dd);
IMongoQuery q = query;
// var count = taoBaoItemRepo.Collection.Count(q);

var sort = new SortByDocument { { "_id", -1 } };
var x = taoBaoItemRepo.Collection.Find(q).SetSortOrder(sort);
sw.Stop();
WorkMsg("自写查询{0}条耗时：{1}
".FormatWith(cacheitems.Count, sw.ElapsedMilliseconds));
return x;
}

业务部份

        /// <summary>
        /// 去重入库线程
        /// </summary>
        public void Work()
        {

            while (true)
            {

                List<TaoBaoItem> cacheitems = ItemCache.GetLItem();
                if (cacheitems != null)
                {

                    Stopwatch sw = new Stopwatch();
                    sw.Start();
                    MongoCursor<TaoBaoItem> rz = QueryItems(cacheitems);
                    foreach (TaoBaoItem doc in rz)
                    {

                        HashCache.Add(doc.Iid);
                    }

                    int i = 0;
                    foreach (var item in cacheitems)
                    {
                        i++;
                        if (HashCache.Add(item.Iid))
                        { 
                              

                            Items.Add(item);
                            //temp计数  并作大于100的判断
                            if (Items.Count >= 100 || (i == cacheitems.Count && ItemCache.Count() == 0))
                            {
                               var seqid = SeqInt(Items.Count) ;
                               seqid = seqid - Items.Count;
                                foreach (var x in Items)
                                {
                                    x.DocId = seqid;
                                    seqid++;                                  
                                }
                                
                                Stopwatch sw1 = new Stopwatch();
                                sw1.Start();
                                taoBaoItemRepo.Add(Items);
                                sw1.Stop();
                                WorkMsg("插入{0}条宝贝耗时：{1}	库内共有宝贝{2}	".FormatWith(Items.Count, sw1.ElapsedMilliseconds, taoBaoItemRepo.Count()));
                                Items.Clear();
                            }
                        }
                    }
                    sw.Stop();
                    WorkMsg("{0}条记录处理[去重+入库]总耗时：{1}
".FormatWith(cacheitems.Count, sw.ElapsedMilliseconds));
                }
                else
                {
                    Thread.Sleep(5000);
                }
            }
        }