Mapping C# object to BsonDocument

Question

I am relatively new to MongoDB. I have an object with the following definition

[BsonDiscriminator("user")]
public Class BrdUser
{
    [BsonId(IdGenerator = typeof(StringObjectIdGenerator))]
    public string ID { get; set; }

    [BsonElement("username")]
    public string UserNm { get; set; }

    [BsonElement("email")]
    public string EmailAdrs { get; set; }
    .
    .
    .
    public IList<Question> Questions{ get; set; } //<-- Un sure as to what Bson type should this be
}

Where Questions is another BsonDocument defined as :

[BsonDiscriminator("userques")]
public class Question
{
    [BsonId(IdGenerator = typeof(StringObjectIdGenerator))]
    public string ID { get; set; }

    [BsonElement("title")]
    public string Title{ get; set; }

    [BsonElement("desc")]
    public string Desciption{ get; set; }
}

My Question is while mapping, what attribute should I use so that the User object deserializes with the Question objects. There is no [BsonDocument] attibute in C# Driver.

Have you tried to serialize objects? what is result? – Saleem Mar 18 '16 at 12:36 — Saleem, Mar 18 '16 at 12:36
My question was what attribute to give to IList – progrAmmar Apr 04 '16 at 04:14 — progrAmmar, Apr 04 '16 at 04:14

score 22 · Accepted Answer · answered Mar 18 '16 at 12:40

22

I'm not sure where are you stuck but try:

var brdDoc = new BrdUser ();
brdDoc.UserNm = "invisible";
brdDoc.EmailAdrs = "someone@womewhere.com";
brdDoc.Questions = new []{ new Question{ Title = "Q", Desciption = "Question to ask" } };

var bsonDocument = brdDoc.ToBsonDocument ();
var jsonDocument = bsonDocument.ToJson ();

Console.WriteLine (jsonDocument);

It will print:

{ 
   "_id" : null, 
   "username" : "invisible", 
   "email" : "someone@womewhere.com", 
   "Questions" : [{ "_id" : null, "title" : "Q", "desc" : "Question to ask" }] 
}

answered Mar 18 '16 at 12:40

Saleem

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Sorry for the late reply, my question is that what will be the Attribute given to Questions list? Will it be [BsonElement] or something else? – progrAmmar Apr 04 '16 at 04:13
You don't have to use attribute. try as it is. – Saleem Apr 04 '16 at 04:18

score 0 · Answer 2 · answered Aug 10 '22 at 16:33

0

Adding these two worked for me.. using MongoDB.Driver; using MongoDB.Bson;

answered Aug 10 '22 at 16:33

supun rathnayaka

1

Mapping C# object to BsonDocument

2 Answers2