EfBuilderExtensions.cs

 public static class EfBuilderExtensions
    {
        /// <summary>
        /// super simple and dump translation of .Contains because is not supported pe EF plus
        /// this translates to contains in EF SQL
        /// </summary>
        /// <param name="source"></param>
        /// <param name="contains"></param>
        /// <returns></returns>
        public static IQueryable<Raspuns> WhereRaspunsContains(this IQueryable<Raspuns> source, IList<int> contains)
        {
            var ors = contains
                .Aggregate<int, Expression<Func<Raspuns, bool>>>(null, (expression, id) => 
                expression == null 
                    ? (a => a.IdIntrebare == id) 
                    : expression.Or(a => a.IdIntrebare == id));

            return source.Where(ors);
        }
    }