c# – MongoDB没有查询

嗨,我试图通过使用Facebook ID列表作为参数来查询我的Mongo数据库,以便返回具有相应帐户的用户列表.该方法在Unity编辑器中工作正常,但是当我在iOS上运行时,我得到一个构造函数错误(我已经设置了一个空白的默认构造函数以解决问题,但它仍然无效)

初始方法

 public void FetchData()
    {
        //data = Mongo.Instance.players.FindAll().ToList();
        if (FB.IsLoggedIn)
        {
            FB.API("me/friends", HttpMethod.GET, FriendsHighscoreHndlr);
        }
    }

回调方法

public void FriendsHighscoreHndlr (IGraphResult FBresult){            
            var dict = Json.Deserialize(FBresult.ToString()) as Dictionary<string,object>;
            var friendList = new List<object>();
            friendList = (List<object>)(dict["data"]);

            int _friendCount = friendList.Count;
            Debug.Log("Found friends on FB, _friendCount ... " +_friendCount);
            List<string> friendIDsFromFB = new List<string>();
            for (int i=0; i<_friendCount; i++) {
                string friendFBID = getDataValueForKey( (Dictionary<string,object>)(friendList[i]), "id");
                string friendName =    getDataValueForKey( (Dictionary<string,object>)(friendList[i]), "name");
                Debug.Log( i +"/" +_friendCount +" " +friendFBID +" " +friendName);
                friendIDsFromFB.Add(friendFBID);
            }
            //friendIDsFromFB.Add(Accesstoken.CurrentAccesstoken.UserId);
            var query = Query.In("facebookID", BsonArray.Create(friendIDsFromFB));
            //Debug.Log(query);
            data = Mongo.Instance.players.Find(query).ToList();
        }

关键方法的数据值

private string getDataValueForKey(Dictionary<string, object> dict, string key) {
            object objectForKey;
            if (dict.TryGetValue(key, out objectForKey)) {
                return (string)objectForKey;
            } else {
                return "";
            }
        }

返回查询结果

{
    "_id" : ObjectId("XXXXXX"),
    "facebookID" : "XXXXXXXXXXXXXX",
    "name" : "John Doe",
    "highscore" : 40501
}

解决方法:

您是否尝试过使用Mongo .NET驱动程序的过滤器？

我建议尝试类似下面的例子. (注意：此事件是在定义为集合的预定义对象上触发的.)

        var filter = Builders<Object>.Filter.Eq(obj => obj.attribute, List<IDs>);