Query MongoDB Using 'ObjectId'

Question

I have inserted documents into MongoDB without an id. And I want to retrieve them by searching through their MongoDB ObjectId, that has been assign

Answer 1

You can also do it this way, its

public static ObjectId GetInternalId(string id)
    {
        if (!ObjectId.TryParse(id, out ObjectId internalId))
            internalId = ObjectId.Empty;

        return internalId;
    }

then in your method you can do something like this

ObjectId internalId = GetMongoId.GetInternalId(id);
        return await YourContext.YourTable.Find(c => c.InternalId == internalId).FirstOrDefaultAsync();

Note: id param in GetInternalId its a parameter on that method. In case you need as this:

public async Task Find(string id)
    {
        ObjectId internalId = GetMongoId.GetInternalId(id);
        return await YourContext.YourTable.Find(c => c.InternalId == internalId).FirstOrDefaultAsync();
    }

Hope it helps also.