MongoDB Find查詢

public class News
{
 public int _id { get; set; }
 public int count { get; set; }
 public string news { get; set; }
 public DateTime time { get; set; }
}
 
 MongoCursor<BsonDocument> allDoc = coll.FindAllAs<BsonDocument>();
 BsonDocument doc = allDoc.First(); //BsonDocument類型參數
 
 MongoCursor<News> allNews = coll.FindAllAs<News>();
 News aNew = allNews.First(); //News類型參數
 
 News firstNews = coll.FindOneAs<News>(); //查找第一個文檔
 
 QueryDocument query = new QueryDocument(); //定義查詢文檔
 query.Add("_id", 10001);
 query.Add("count", 1);
 MongoCursor<News> qNews = coll.FindAs<News>(query);
 
 
 BsonDocument bd = new BsonDocument();//定義查詢文檔 count>2 and count<=4
 bd.Add("$gt", 2);
 bd.Add("$lte", 4);
 QueryDocument query_a = new QueryDocument();
 query_a.Add("count",bd);
 
 FieldsDocument fd = new FieldsDocument();
 fd.Add("_id", 0);
 fd.Add("count", 1);
 fd.Add("time", 1);
 
 MongoCursor<News> mNewss = coll.FindAs<News>(query_a).SetFields(fd);//只返回count和time
 
 var time = BsonDateTime.Create("2011/9/5 23:26:00");
 BsonDocument db_t = new BsonDocument();
 db_t.Add("$gt", time);
 QueryDocument qd_3 = new QueryDocument();
 qd_3.Add("time", db_t);
 
 MongoCursor<News> mNews = coll.FindAs<News>(qd_3);//