Bdtjtk

I have a Dictionary<string, object> as an insertion input for MongoDB.Save().

When I fill this dictionary with primitive types - the serialization process works fine but when I'm trying to insert my dictionary filled with some custom class (for example - Person class) I'm getting the next error:
.NET type 'Person' cannot be mapped to a BsonValue

I noticed that if I insert my custom type converted to BsonDocument the serialization process work great.

How can I define MongoDB to serialize a particular class as BsonDocument?

Update: real code provided

    here is my SensorData class: 



    [DataContract]

    public class SensorData

    {



        [DataMember]

        [BsonElement]

        [BsonRepresentation(BsonType.String)]

        public string Type { get; set; }



        [DataMember]

        [BsonElement]

        [BsonRepresentation(BsonType.String)]

        public string Desc { get; set; }



        [DataMember]

        [BsonElement]

        [BsonRepresentation(BsonType.String)]

        public SensorStatus Status { get; set; }



        [DataMember]

        [BsonElement]

        [BsonRepresentation(BsonType.String)]

        public string Value { get; set; }



        [DataMember]

        [BsonElement]

        [BsonRepresentation(BsonType.String)]

        public string ValueUnits { get; set; }



        [DataMember]

        [BsonElement]

        [BsonRepresentation(BsonType.Boolean)]

        public bool Event { get; set; }



        [DataMember]

        [BsonElement]

        [BsonRepresentation(BsonType.Int32)]

        public int TTL { get; set; }

    }

Here is the methods which saves the data to MongoDB:

public void Save(Dictionary<string, object> RawSensorMessageDictionary)

        {          

            try

            {

                var policyColl = new MongoClient(ConnString).GetServer().GetDatabase(DB_NAME).GetCollection<BsonDocument>(CollectionNames.RawSensorMessage.ToString());





                if (!RawSensorMessageDictionary.Any(p => p.Key == "_id")) //if rawSensorMessageID is empty, mongodb will set it

                    RawSensorMessageDictionary.Add("_id", ObjectId.GenerateNewId().ToString());

                var bsonObj = new BsonDocument(RawSensorMessageDictionary);

                policyColl.Save(bsonObj);



            }

            catch (Exception ex)

            {

                   //log exception

            }

        }

And here is the code from my UnitTest:

            DataAccess.MongoDAL dal = new DataAccess.MongoDAL();

            Dictionary<string, object> dic = new Dictionary<string, object>();

            dic.Add("1", true);

            dic.Add(Message.RESOURCE_TYPE, "aaa");

            dic.Add(Message.RESOURCE_NAME, "bbb");

            dic.Add(Message.SENSOR_DATA, new SensorData { Desc = "aaa", Event = true, Status = SensorStatus.Active, TTL = 4, Type = "sss", Value = "222" });

            dal.SaveRawSensorData(dic );

I want my app to Serialize automatically SensorData object to BsonDocument. If I don't do it manually I'm getting the following exception: .NET type 'SensorData' cannot be mapped to a BsonValue

How should I do it?

Update 2:
OK found the issue, In my "save to db" method I used the next code in order to convert my dictionary BsonDocument:

        var bsonObj = new BsonDocument(RawSensorMessageDictionary);

I would expect that creating a new instance of 'BsonDocument' from other object will handle the conversion exactly like object.ToBsonDocument() does but apparently it's not.

Finally I replaced the code above to the following one:

    var bsonObj = RawSensorMessageDictionary.ToBsonDocument();

    dal.SaveRawSensorData(dic );

now it works.

If the string in the dictionary is the property in your mongodb document, than a non primitive type is a subdocument in mongodb. Please try to mark all properties in the class with [BsonElement] and the Bson Id with [BsonId]. And be sure you follow all rules from here: Serialize Documents with the C# Driver
It would be nice, if you provide some more information

EDIT 1
I would try to remove all properties of SensorData besides Value. If this works, i would than add all other (one by one).