Build dynamic LINQ?

Question

I\'m using LINQ to query data. Consider a case where the user only wants to report on say 1 of the 3 fields? (see below)

Can anyone tell me how to build the query d

Answer 1

like this:

namespace overflow4
{
    class Program
    {
        static void Main(string[] args)
        {
            var orig = new List() { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 };

            var newlist = FilterNumbers(orig, true, false, false);

            foreach (int x in newlist)
                Console.WriteLine(x);
            Console.ReadLine();
        }

        private static IEnumerable FilterNumbers(
            List origlist, 
            bool wantMultiplesOf2, 
            bool wantMultiplesOf3, 
            bool wantMultiplesOf5)
        {
            IEnumerable sofar = origlist;

            if (wantMultiplesOf2)
                sofar = sofar.Where(n => n % 2 == 0);

            if (wantMultiplesOf3)
                sofar = sofar.Where(n => n % 3 == 0);

            if (wantMultiplesOf5)
                sofar = sofar.Where(n => n % 5 == 0);

            return sofar;
        }
    }
}