C# Reflection Type.GetField array

Im trying to read variable array from string and show it in console but each time I run the program Im getting error: "Object reference not set to an instance of an object." Can anyone suggest how to do this?

my code:

public class Positions
{
   public static string[] test = { "test", "test2" };
}

private void test()
{
   Positions pos = new Positions();

   Type type = typeof(Positions);
   FieldInfo fi = type.GetField("test[0]");

   Console.WriteLine(fi.GetValue(pos));
}