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?

possible duplicate? stackoverflow.com/questions/60264331/… — Kaj
– Kaj, Commented Mar 4, 2020 at 13:49
_id in mongo is simply a hex string, could you just create a uuid / hex in c#, assign it to your domain then save it? not sure how good practice this is though. also why are you inserting json directly into your db and not creating a dedicated domain object? docs.mongodb.com/manual/reference/method/ObjectId — Jack Branch
– Jack Branch, Commented Mar 4, 2020 at 13:50

mickl · Accepted Answer · 2020-03-05 13:04:06Z

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();

edited Mar 5, 2020 at 13:04

answered Mar 4, 2020 at 14:57

mickl

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2 Comments

Nands Over a year ago

I tried that but the below got inserted: _id:ObjectId("5e60abdd89b5880a48464df0") We want only _id:"5e60abdd89b5880a48464df0" to go into the MongoDb.

Nands Over a year ago

The solution in my case was : document["_id"] = ObjectId.GenerateNewId().ToString(); If you could put it as the answer, I would mark it as the answer.

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