using System;

using System.Collections.Generic;

public class Program {

    public static void Main() {

        // Lista con todos los developers (sin filtro)

        List<Developer> devList = new List<Developer>();

        devList.Add(new Developer("David", "Arellano", new ProgrammingLang("Dart")));

        devList.Add(new Developer("Chava", "García", new ProgrammingLang("C#")));

        devList.Add(new Developer("Ivan", "La wea", new ProgrammingLang("C#")));

        devList.Add(new Developer("Isma", "Hernández", new ProgrammingLang("Phyton")));

        devList.Add(new Developer("Cristhian", "Juarez", new ProgrammingLang("JS")));

​

        // Filtro

        String filter = "C";

        // Nueva lista filtrada

        List<Developer> filteredList = new List<Developer>();

        // Condición de búsqueda, puedes agregar las deseadas, por ejemplo:

        // devList.FindAll(developer => developer.name.Contains("filter"));

        filteredList = devList.FindAll(

            developer => developer.name.Contains(filter) 

            || developer.lastname.Contains(filter)

            || developer.favoriteProgrammingLang.name.Contains(filter));

        foreach (Developer developer in filteredList){

            Console.WriteLine(developer.name + " " + developer.lastname + ", " + developer.favoriteProgrammingLang.name);   

        }

    }

}

​

public class Developer {

    public String name;

    public String lastname;

    public ProgrammingLang favoriteProgrammingLang;

    public Developer(String name, String lastname, ProgrammingLang lang){

        this.name = name;

        this.lastname = lastname;

        this.favoriteProgrammingLang = lang;

    }

}

​

public class ProgrammingLang {

    public String name;

    public ProgrammingLang(String name){

        this.name = name;

    }

}