using System;
using MongoDB.Bson.Serialization.Attributes;
using MongoDB.Driver;

namespace MongoTest
{
    internal class Program
    {
        static void Main(string[] args)
        {
            var collection = new MongoClient("mongodb://localhost:C2y6yDjf5/R+ob0N8A7Cgv30VRDJIWEHLM+4QDU5DE2nQ9nDuVTqobD4b8mGGyPMbIZnqyMsEcaGQy67XIw/Jw==@localhost:10255/admin?ssl=true")
                .GetDatabase("foodb")
                .GetCollection<Entity>("barcol")
                .OfType<Foo>();

            var foo = new Foo
            {
                Title = "Foobar2000"
            };

            collection.InsertOneAsync(foo).Wait();

            Console.WriteLine(foo.Id);
            Console.ReadLine();
        }
    }

    /// <summary>
    /// Class for generic database entity with identifier.
    /// </summary>
    /// <typeparam name="T"></typeparam>
    [BsonKnownTypes(typeof(Entity))]
    public class Entity<T>
    {
        /// <summary>
        /// Gets or sets the identifier.
        /// </summary>
        /// <value>The identifier.</value>
        [BsonId]
        //[BsonIgnoreIfDefault] 
        public T Id { get; set; }
    }

    /// <summary>
    /// Class for database entity with guid identifier.
    /// </summary>
    [BsonKnownTypes(typeof(Foo))]
    public class Entity : Entity<Guid>
    {
    }

    public class Foo : Entity
    {
        /// <summary>
        /// Gets or sets the title.
        /// </summary>
        /// <value>The title.</value>
        public string Title { get; set; }
    }
}