Generating _id for MongoDb

Question

We are using MongoDB C#.NET Driver to insert entry as below:

var JSON = "{ 'UserName': '" + "Roy" + "', 'PasswordHash' : '" + "123" + "' }";

            var document = BsonSerializer.Deserialize<BsonDocument>(JSON);

            await collection.InsertOneAsync(document);

In MongoDb, it goes with

_id:ObjectId("5e54f9ea045dba534831a1a2")

Which gives issues when retrieved and tried to convert into json. How can I set the _id from C# code itself?

Answer 1

The _id is always generated on a client side - the driver does that behind the scenes when you run .Insert() or .Save(). You can do that manually by running:

document["_id"] = ObjectId.GenerateNewId().ToString();