我们如何解决前。消息 = "Unable to cast object of type 'MongoDB.Bson.ObjectId' to type 'MongoDB.Bson.BsonVal

Question

All：

插入MongoDB

数据库后，我无法将类型为"MongoDB.Bson.ObjectId"的对象转换为类型"MongoDB.Bson.BsonValue">

       ELLCsInterfaceLogEvent aLogEvent = null;
        try
        {
            MongoDB.Bson.ObjectId  UmbrellaLogIdAsObjectId = (ObjectId)UmbrellaLogId;
            BsonDocument logEventBsonDoc = new BsonDocument { 
                                    {"UmbrellaLogId",(BsonValue)UmbrellaLogIdAsObjectId}
                                 }; // end of new BsonDocument
            objUtility = new Utility();
            objUtility.Insert(logEventBsonDoc, "FMS_TM_MST_LogEvents");
            string[] arrFields = { "UmbrellaLogId" };
            IMongoQuery query = Query.EQ("UserID", (BsonValue)UmbrellaLogId);
           aLogEvent = DBConnection.database.GetCollection<ELLCsLogEvent>("FMS_TM_MST_LogEvents")
                                          .Find(query).SetFields(arrFields).ToList<ELLCsInterfaceLogEvent>().FirstOrDefault();
        }
        catch (Exception ex)
        {
            string something = ex.Message;
        }

如何轻松地在无法强制转换类型为"MongoDB.Bson.ObjectId"的对象到类型"MongoDB.Bson.BsonValue"之间转换？

Answer 1

对不起，误报。 这是一个愚蠢的编程错误。
在我的查询中检查我是否插入了条目，我未能进行转换。

这是正确的代码：

        ELLCsInterfaceLogEvent aLogEvent = null;
        try
        {
            //BsonValue bval = MongoDB.Bson.BsonValue((ObjectId)UmbrellaLogId);
            //new MongoDB.Bson.BsonValue((ObjectId)UmbrellaLogId);
            MongoDB.Bson.ObjectId  UmbrellaLogIdAsObjectId = (ObjectId)UmbrellaLogId;
            BsonDocument logEventBsonDoc = new BsonDocument { 
                                    {"UmbrellaLogId",(BsonValue)UmbrellaLogIdAsObjectId}
                                 }; // end of new BsonDocument
            objUtility = new Utility();
            objUtility.Insert(logEventBsonDoc, "FMS_TM_MST_LogEvents");
            string[] arrFields = { "UmbrellaLogId" };
            IMongoQuery query = Query.EQ("UmbrellaLogId", (BsonValue)UmbrellaLogIdAsObjectId);
           aLogEvent = DBConnection.database.GetCollection<ELLCsLogEvent>("FMS_TM_MST_LogEvents")
                                          .Find(query).SetFields(arrFields).ToList<ELLCsInterfaceLogEvent>().FirstOrDefault();
        }
        catch (Exception ex)
        {
            string something = ex.Message;
        }
        return aLogEvent;