Strongly typed RedirectToAction in ASP.NET Core (work in progress)

ControllerExtensions.cs

// todo: get route values from action parameters?
public static RedirectToActionResult RedirectToAction<T>(this Controller controller, Expression<Action<T>> action, object routeValues) where T : Controller
{
    if (!(action?.Body is MethodCallExpression body)) throw new ArgumentException("Expression must be a method call.");
    if (body.Object != action.Parameters[0]) throw new ArgumentException("Method call must target lambda argument.");
    
    string actionName = body.Method.Name;

    var actionNameAttributes = body.Method.GetCustomAttributes(typeof(ActionNameAttribute), false);
    if (actionNameAttributes.Length > 0)
    {
        var actionNameAttr = (ActionNameAttribute)actionNameAttributes[0];
        actionName = actionNameAttr.Name;
    }

    string controllerName = typeof(T).Name;

    if (controllerName.EndsWith("Controller", StringComparison.OrdinalIgnoreCase))
    {
        controllerName = controllerName.Remove(controllerName.Length - 10, 10);
    }
    return new RedirectToActionResult(actionName, controllerName, routeValues);
}