using System;

using System.Threading.Tasks;

using System.Linq;

using System.Collections;

using System.Collections.Generic;

public class Program

{

    public async static Task Main()

    {

        var foo = new Foo();

        foo.Load();

        await foo.LoadAsync();

        foreach (var carSync in foo.CarsSync)

            Console.WriteLine(carSync.Text);

        foreach (var carSync in foo.CarsAsync)

            Console.WriteLine(carSync.Text);

    }

}

​

public class Foo

{

    public IList<Cars> CarsSync { get; set; }

    public IList<Cars> CarsAsync { get; set; }

    public void Load()

    {

        CarsSync = GetCars(true).Result.Values.ToList();

    }

    public async Task LoadAsync()

    {

        var dictionary = await GetCars(false);

        CarsAsync = dictionary.Values.ToList();

    }

    public Task<Dictionary<long, Cars>> GetCars(bool isSync)

    {

        return Task.Run(() => {

            return new Dictionary<long, Cars>(){

                {1, new Cars($"Car 1 | IsSync = {isSync}")},

                {2, new Cars($"Car 2 | IsSync = {isSync}")},

            };

        });

    }   

}

​

public class Cars

{

    public string Text { get; set; }

    public Cars(string text)

    {

        Text = text;

    }

}