LINQ to Entities中的"NOT IN"子句

using System;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };
        List<int> excludeNumbers = new List<int> { 3, 4 };

        var result = numbers.Where(n => !excludeNumbers.Contains(n)).ToList();

        foreach (var num in result)
        {
            Console.WriteLine(num);
        }
    }
}

using (var context = new MyDbContext())
{
    List<int> excludeCategories = new List<int> { 3, 4 };

    var result = context.products
        .Where(p => !excludeCategories.Contains(p.CategoryId))
        .ToList();
}