Zapytanie LINQ WHERE IN

foreach (string sourceFile in Directory.GetFiles(SourcePath, "*.*", SearchOption.AllDirectories).Where(s => s.EndsWith(".jpg") || s.EndsWith(".tif")))
{
}

var exts = new List<string> { "jpg", "bmp", "tif" };

...Where(element => exts.Contains(element.Extension))... // gdzie Extension to własność klasy, której obiektem w lambdzie jest element

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _4p
{
    class Program
    {
        static void Main(string[] args)
        {
            var testPhrases = new List<string> { "hello.bmp", "kitty.exe", "silent.jpg", "fire.bmp", "s.x" };
            var wantedExtensions = new List<string> { ".bmp", ".jpg" };
            var minFileNameLength = 4;

            foreach (string phrase in testPhrases.Where(p => 
                p.Length >= minFileNameLength && 
                wantedExtensions.Contains(p.Substring(p.Length - minFileNameLength, minFileNameLength))))
            {
                Console.WriteLine(phrase);
            }
        }
    }
}