Mongodb在CSharp里实现Aggregate实例

本篇文章主要介绍了Mongodb在CSharp里实现Aggregate实例，小编觉得挺不错的，现在分享给大家，也给大家做个参考。一起跟随小编过来看看吧

今天主要用了一个mongodb.driver里的分组，事实上在网上介绍这方面的文章非常少，以至于我在出现问题后，无法找到一个正确的解决方案，最后还是通过异常信息找到的解决方法，所以感觉自己更应该去写一篇关于如何在Ｃ＃驱动里进行聚合Aggregate的文章！

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									/// <summary>

									    /// 返回UI消息树

									    /// </summary>

									    /// <returns></returns>

									    public static string GetMongoLog(DateTime? fromDate, DateTime? toDate, int page = 1)

									    {

									      string from = DateTime.Now.Date.ToString("yyyy-MM-dd");

									      string to = DateTime.Now.Date.AddDays(1).ToString("yyyy-MM-dd");

									      if (fromDate.HasValue)

									      {

									        from = fromDate.Value.ToString("yyyy-MM-dd");

									      }

									      if (toDate.HasValue)

									      {

									        to = toDate.Value.ToString("yyyy-MM-dd");

									      }

									      var stages = new List<IPipelineStageDefinition>();

									      stages.Add(new JsonPipelineStageDefinition<BsonDocument, BsonDocument>("{$match:{AddTime:{$gt:ISODate('" + from + "'),$lt:ISODate('" + to + "')}}}"));

									      stages.Add(new JsonPipelineStageDefinition<BsonDocument, BsonDocument>("{$group:{_id: "$RootId", count: {$sum: 1}}}"));

									      stages.Add(new JsonPipelineStageDefinition<BsonDocument, BsonDocument>("{$skip:" + page * 5 + "}"));

									      stages.Add(new JsonPipelineStageDefinition<BsonDocument, BsonDocument>("{$limit:5}"));

									      var pipeline = new PipelineStagePipelineDefinition<BsonDocument, BsonDocument>(stages);

									      var result = NoSql.MongodbManager<LoggerContext>.Collection.Aggregate(pipeline);

									      StringBuilder str = new StringBuilder();

									      str.Append("<ol class='treeMsg'>");

									      foreach (var item in result.ToList())

									      {

									        var timer = new List<DateTime>();

									        var old = NoSql.MongodbManager<LoggerContext>.Instance.Find(i => i.RootId == item.Values.ToArray()[0].ToString() && i.ParentId == null).FirstOrDefault();

									        timer.Add(old.AddTime);

									        str.Append("<li style='margin:5px;border:1px dashed #aaa'>");

									        str.AppendFormat("<span style='color:red;'>{0}</span><span style='color:green'>{1}</span><span>{2}</span>"

									          , old.Url

									          , old.MessageBody

									          , old.AddTime);

									        MsgTree(str, old.ChildId, timer);

									        str.AppendFormat("<p><b><em>本次请求用时{0}毫秒（{1}秒）<em></b></p>"

									          , (timer.Max() - timer.Min()).TotalMilliseconds

									          , (timer.Max() - timer.Min()).TotalSeconds);

									        str.Append("</li>");

									      }

									      str.Append("</ol>");

									      return str.ToString();

									    }