Question

I decided to try out LINQ for the first time to try and solve this question.

The results of my first foray into the wonderful world of LINQ looked like this:

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

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            List<string> list = new List<string>() 
            { 
               "fred-064528-NEEDED1", 
               "xxxx", 
               "frederic-84728957-NEEDED2", 
               "sam-028-NEEDED3", 
               "-----", 
               "another-test" 
            };

            var result =
            from s in list
            where (from c in s where c == '-' select c).Count() == 2
            select s.Substring(s.LastIndexOf("-") + 1);

            foreach (string s in result)
                Console.WriteLine(s);
            Console.WriteLine("Press Enter");
            Console.ReadLine();
        }
    }
}

I’d like to know how I can improve the above solution to this contrived little example. I’m not too interested in whether I’ve used the best validation method, or how I could localise “Press Enter” or anything like that; I’m just interested in using this example to learn a little more about LINQ.

Answer 1

var result =
        from s in list
        where s.Count(x => x == '=') == 2
        select s.Substring(s.LastIndexOf("-") + 1);