How to use MongoDB C# Driver without specifying a class

Question

I am using MongoDB c# driver 2.0. I a trying to get a collection without specifying a type or class. Observe:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MongoDB.Bson;
using MongoDB.Driver;
using MongoDB.Driver.Core;
using MongoDB.Driver.Linq;
using MongoDB.Shared;

namespace Meshplex.Service.DataWarehouse
{
    public class ProfileControllerMongoDB
    {
        private IMongoDatabase _mongoDb;
        private IMongoCollection _myCollection;
        //private IMongoCollection<ClassHere> _myCollection;

        public ProfileDataControllerMongoDB()
        {
            _mongoDb = GetMongoDatabase();
            _myCollection = _mongoDb.GetCollection(GetCollectionName());
            //_myCollection = _mongoDb.GetCollection<ClassHere>("Collection");
        }

        public async Task<string> GetAllRecords()
        {
            //This should return json
            return await _myCollection.Find(new BsonDocument());
        }

As you see I should be specifying a class when declaring IMongoCollection. Is there a way to use MongoDB Driver without specifying a a class?

Have you tried using <dynamic> in there? See mongodb.github.io/mongo-csharp-driver/2.0/what_is_new/#new-api — Ron Beyer
– Ron Beyer, Commented Apr 30, 2015 at 1:10
You are calling _mongoDb.GetCollection without declaring a class, that should work for you — faljbour
– faljbour, Commented Apr 30, 2015 at 1:27
@faljbour It is giving me a syntax error. The commented out code will work. But don't want to specify a class. — Luke101
– Luke101, Commented Apr 30, 2015 at 1:37
@RonBeyer: Care to post that as an answer so the question is officially answered? Upvote promised... — mnemosyn
– mnemosyn, Commented Apr 30, 2015 at 7:50

Nate Anderson · Accepted Answer · 2024-01-08 20:20:09Z

11

MongoDb supports a dynamic type in the generic parameter.

IMongoCollection<dynamic> _myCollection = _mongoDb.GetCollection<dynamic>("Collection");

See http://mongodb.github.io/mongo-csharp-driver/2.0/what_is_new/#new-api . Example below:

Support for dynamic.

var person = new ExpandoObject(); 
person.FirstName = "Jane";
person.Age = 12; person.PetNames = new List<dynamic> { "Sherlock", "Watson" };
await db.GetCollection<dynamic>("people").InsertOneAsync(person);

edited Jan 8, 2024 at 20:20

Nate Anderson

21.6k22 gold badges113 silver badges155 bronze badges

answered Apr 30, 2015 at 12:14

Ron Beyer

11.3k1 gold badge24 silver badges39 bronze badges

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