MongoConnector.cs

public class MongoConnector
{
    private readonly IMongoClient _client;
    private readonly IMongoDatabase _database;

    public MongoConnector(MongoConfig config)
    {
        _client = new MongoClient(config.ConnectionString);
        _database = _client.GetDatabase(config.DatabaseName);
    }

    public IMongoCollection<T> GetCollection<T>(string collectionName)
    {
        return _database.GetCollection<T>(collectionName);
    }
}

public interface MongoConfig
{
    string ConnectionString { get; set; }
    string DatabaseName { get; set; }
}