Mongodb 批量Upsert

        List<UpdateOneModel<Entity>> requests = new List<UpdateOneModel<Entity>>(entities.Count());
        foreach (var entity in entities)
        {
            var filter = new FilterDefinitionBuilder<Entity>().Where(m => m.Field1 == entity.Field1 && m.Field2== entity.Field2);
            var update = new UpdateDefinitionBuilder<Entity>().Set(m => m.Field1, entity.Field1).Set(m => m.Field2, entity.Field2);
            var request = new UpdateOneModel<Entity>(filter, update);
            request.IsUpsert = true;
            requests.Add(request);
        }
        await Collection.BulkWriteAsync(requests);

　　http://stackoverflow.com/questions/34543056/mongodb-c-sharp-driver-upsert-many-based-on-candidate-key

我的:

var advisorEmails = Database.GetCollection<AdvisorEmail>(Settings.AdvisorEmailCollection).Find(Builders<AdvisorEmail>.Filter.In(x => x.Id, dicAdvisorEmail.Keys)).ToList();
					if (advisorEmails != null && advisorEmails.Count > 0) {
						List<UpdateOneModel<AdvisorEmail>> lstUpdateActions = new List<UpdateOneModel<AdvisorEmail>>();
						List<string> lstRemoveAdvisorEmailIds = new List<string>();
						foreach (AdvisorEmail advisorEmail in advisorEmails)
						{
							if (dicAdvisorEmail.ContainsKey(advisorEmail.Id)) {
								List<string> lstRemoveIds = dicAdvisorEmail[advisorEmail.Id];
								List<string> lstnewIds = new List<string>();
								foreach (string s in advisorEmail.ClientIds) {
									if (!lstRemoveIds.Contains(s)) lstnewIds.Add(s);
								}
								if (lstnewIds.Count > 0)
								{
									var filter = new FilterDefinitionBuilder<AdvisorEmail>().Where(m => m.Id == advisorEmail.Id);
									var update = new UpdateDefinitionBuilder<AdvisorEmail>().Set(m => m.ClientIds, lstnewIds);
									var action = new UpdateOneModel<AdvisorEmail>(filter, update);
									action.IsUpsert = true;
									lstUpdateActions.Add(action);

								}
								else {
									lstRemoveAdvisorEmailIds.Add(advisorEmail.Id);
								}
							}
						}
						if (lstUpdateActions.Count > 0)
							Database.GetCollection<AdvisorEmail>(Settings.AdvisorEmailCollection).BulkWrite(lstUpdateActions);
						if (lstRemoveAdvisorEmailIds.Count > 0)
							LocalAdvisorEmailDB.DeleteMany(Filter<AdvisorEmail>().In(x => x.Id, lstRemoveAdvisorEmailIds));
					}