using System;

using System.Linq;

using System.Collections.Generic;

​

​

public class Program

{

    enum MyEnum

    {

        Red = 0xF00,

        Orange = 0xFF0,

        Yellow = 0x0F0,

        Green = 0x0FF,

        Blue = 0x00F,

        Purple = 0xF0F

    }

    public static IList<T> GetFlaggedValues<T>(T input) where T : IConvertible

    {

        Enum flag = input as Enum;

        if (flag == null) return new List<T>();

        return Enum

            .GetValues(typeof(T))

            .Cast<Enum>()

            .Where(e => e.HasFlag(flag))

            .Cast<T>()

            .ToList();

    }

    public static void Main()

    {

        var list = GetFlaggedValues(MyEnum.Blue);

        foreach (var e in list)

        {

            Console.WriteLine(e);

        }

    }

}