FieldsReflection.cs

public static void Main()
{
    object instance = new Vector3(1, 2, 3);

    foreach (FieldInfo property in instance.GetType().GetFields())
    {
        Console.WriteLine($"{property.Name}: {property.GetValue(instance)}");
        // X: 1
        // Y: 2
        // Z: 3
    }
}