namespace App
{
    using System.Collections.Generic;
    using System.Linq;
    using System.Data.Entity;
    using MongoDB.Driver;

    class Program
    {
        static void Main(string[] args)
        {
            var context = new SampleContext();
            
            var ids = context.Customers.Select(e => e.CustomerId);
            var arr = ids.ToArray();
            
            var mongoQuery = new MongoClient("mongodb://localhost:27017")
                .GetDatabase("MyShop")
                .GetCollection<MongoCustomer>("MongoCustomer")
                .AsQueryable();

            // OK
            mongoQuery.Where(e => arr.Contains(e.CustomerId)).ToArray();

            // StackOverflow
            mongoQuery.Where(e => ids.Contains(e.CustomerId)).ToArray();
        }
    }

    public class MongoCustomer
    {
        public int CustomerId { get; set; }
        public string Name { get; set; }
    }

    public class Customer
    {
        public int CustomerId { get; set; }
        public string Name { get; set; }
    }

    public class SampleContext : DbContext
    {
        public SampleContext() : base("MyShop")
        {
        }

        public DbSet<Customer> Customers { get; set; }
    }
}