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Quote from the OP:

even have a reference implementation someone else wrote that works that I've been following.

honey the codewitch wrote:

Why the nullable string type though?

honey the codewitch wrote:

Have you considered using Lazy<T>

public static string? hello => GetResource("hello", GetDictionaries(Culture));

if(myres==null) {
   // fetch my res
}
return myres;

public partial class TestResource
{
    public static string fsf    => _fsf ?? (_fsf = GetResource("fsf", GetDictionaries(Culture)));
    public static string hello  => _hello ?? (_hello = GetResource("hello", GetDictionaries(Culture)));
    public static string name   => _name ?? (_name = GetResource("name", GetDictionaries(Culture)));

    private static string? _fsf;
    private static string? _hello;
    private static string? _name;

    static partial void UpdateValues()
    {
        _fsf = null;
        _hello = null;
        _name = null;
    }

    static TestResource()
    {
        AddCultureDictionary("", new Dictionary<string, string>
        {
            { "fsf", "ffs" },
            { "hello", "hello" },
            { "name", "name" },
        });
        AddCultureDictionary("fr-FR", new Dictionary<string, string>
        {
            { "fsf", "nom de dieu" },
            { "hello", "salut" },
            { "name", "nom" },
        });
    }
}

private static string _greeting;

public static string Greeting(object p0, object p1)
{
    string value = _greeting ??= GetResource("Greeting", GetDictionaries(Culture));
    return string.Format(value, p0, p1);
}

To alcohol! The cause of, and solution to, all of life's problems - Homer Simpson

To alcohol! The cause of, and solution to, all of life's problems - Homer Simpson

To alcohol! The cause of, and solution to, all of life's problems - Homer Simpson

David O'Neil wrote:

906 kilowatt-hours, [...] enough to power a two-person household for about three months.