using System;

using System.IO;

using System.Linq;

using System.Collections.Generic;

​

public class TestWrapper<T> : List<T>

{

    public int Total { get; set; }

}

​

public class Program

{

    public static void Main()

    {

        IEnumerable<string> test = GetData();

        Console.WriteLine(test.Count());

    }

    public static TestWrapper<string> GetData()

    {

        var stringarray = new [] { 

            "a", "b", "c",      

        };

        var result = new TestWrapper<string>

        {

            Total = 45,

        };

        result.AddRange(stringarray);

        return result;

    }

}