MongoDB发出类型为double[duplicate]的读取值

amount 存储为 4.77 double .

我正在使用mongo的C#驱动程序阅读Bson文档

     var collection = _mongoDatabase.GetCollection<BsonDocument>("mycollection");
     var filter = Builders<BsonDocument>.Filter.Eq("_id", id);
     await collection.Find(filter)
            .ForEachAsync(document => 
            {                    
                var val = document.GetValue("amount");
            });

但是,它将值读取为 4.7699999999999996