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Encontre e modifique com MongoDB C#


O código a seguir faz isso (C# MongoDB.Driver 2.0) 
var collection = database.GetCollection<BsonDocument>("product");
var filter = new BsonDocument();
var update = Builders<BsonDocument>.Update.Inc("UseCount", 1);
var sort = new FindOneAndUpdateOptions<BsonDocument>
{
            Sort = Builders<BsonDocument>.Sort.Ascending("UseCount")
};
await collection.FindOneAndUpdateAsync(filter, update, sort);