private IActionResult Convert <T>(AppResponse <T> appResponse, Func <T, string> contentRetriever)
{
switch (appResponse)
{
case AppResponse <T> .Ok c: return(Content(contentRetriever(c.Content), "application/json"));
case AppResponse <T> .Error c: return(StatusCode((int)c.HttpStatusCode, c.Message));
default:
throw new InvalidOperationException($"Unexpected response type: {appResponse?.GetType().Name ?? "<NULL>"}");
}
}