MongoDB: increment the integer field (C#)

Question

How to increment integer field in atomic manner? Can FindAndModify method helps?

For example document contains field count and I wanna to increment it without retrieving full document and saving back.

Answer 1

I did leave a comment but I found it. The $inc modifier will increment a field internally. Completely atomically for this exact purpose.

See here "Monog DB Atomic Operations"

Answer 2

Based on the answer from Paystey here's some code using version 2.1.0 of the C# driver, just in case someone else needs it:

var filter = Builders<BsonDocument>.Filter.Eq("_id", id);
var update = new BsonDocument("$inc", new BsonDocument { { "votes", 1 } });
var coll = db.GetCollection<BsonDocument>("collection");
var doc = coll.FindOneAndUpdateAsync(filter, update).Result;