MongoDb .net Official Driver 一些用法

1. MapId:

            BsonClassMap.RegisterClassMap<NetWorth>(cm =>
            {
                cm.AutoMap();
                cm.MapIdField(n => n.TradingDay);
            });

1. Find

           var b = Builders<NetWorth>.Filter;
            var filter = b.Gte("_id", begin) & b.Lte("_id", end);
            var sort = Builders<NetWorth>.Sort.Ascending("_id");
            vt = col.Find(filter).Sort(sort).ToList();

1. Projection

           var b = Builders<NetWorth>.Filter;
            var filter = b.Gte("_id", begin) & b.Lte("_id", end);
            var sort = Builders<NetWorth>.Sort.Ascending("_id");
            var p = Builders<NetWorth>.Projection.Include("_id");
            vtBsonDocument = col.Find(filter).Project(p).Sort(sort).ToList();
            vtId = col.Find(filter).Project(x=>x._id).Sort(sort).Limit(1).ToList()