using System;

using System.Collections.Generic;

​

public class Foo

{

    public string Field1;

    public readonly List<string> Field2;

    public Foo()

    {

        Field2 = new List<string>();

    }

}

public class Program

{

    public static void Main()

    {

        var x = SomeMethod();

    }

    public static List<Foo> SomeMethod()

    {

        return new List<Foo>()

        {

            new Foo()

            {

                Field1 = "foobar",

                //Field2.Add("oneString") is what I want to do

            },

            new Foo()

            {

                Field1 = "foobarfoobar",

                //Field2.Add("oneString") is what I want to do

            },

        };

    }

}