How to do ObjectId serialization in C# Driver 2.3.0-beta1

[Erlend Sand Bærland]

Pre .NET Core in the previous c# driver (2.2.4) I could have a model like this one.

    public class Model

    {

        [BsonId]

        public ObjectId _id { get; set; }
    }

Used with a controller it produced the following JSON-schema:

{ "_id": "string"
}

In the latest beta ObjectId is returned like this:

{ "_id": { "timestamp": 0, "machine": 0, "pid": 0, "increment": 0, "creationTime": "2016-08-29T09:32:26.630Z" }
}

How can I have the ObjectId returned as a string?

I'm guessing I'm missing a formatter or an object binder. 

[Robert Stam]

I am unable to reproduce what you are describing. I used the following test program:

public class Model
{
    [BsonId]
    public ObjectId _id { get; set; }
}
 

public class Program
{
    public static void Main(string[] args)
    {
        var m = new Model { _id = ObjectId.Parse("112233445566778899aabbcc") };
        var json = m.ToJson();
        Console.WriteLine(json);
        Console.ReadLine();
    }
}

And the output was:

{ "_id" : ObjectId("112233445566778899aabbcc") }

If you want the _id to be output as a string you would decorate the _id property with the BsonRepresentation attribute:

public class Model
{
    [BsonId]
    [BsonRepresentation(BsonType.String)]
    public ObjectId _id { get; set; }
}

which changes the output to:

{ "_id" : "112233445566778899aabbcc" }

Note: 2.3.0-beta1 does have a  problem with missing dependencies so to get the above to run I had to manually add a dependency on System.Collections.NonGeneric.

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[Erlend Sand Bærland]

I changed my model to: 

public class Model
{
        [BsonId]

        [BsonRepresentation(BsonType.ObjectId)]

        public string _id { get; set; }

}

...which seems to work nicely. 

But, I'm not sure which implications this will have. 

[Robert Stam]

The difference between the annotation I tried and the one you tried is just that with my annotation the _id is a an ObjectId in memory but a string in the database, and with your annotation the _id is a string in memory but an ObjectId in the database.

Both are valid depending on your needs.

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