Partial declarations must not specify different base classes

Question

Guys I am new to WPF .

I have a wpf page named StandardsDefault. In the code behind, StandardsDefault is inheriting Page, l

Answer 1

In your CountryStandards.xaml you should write

<StandardsDefault x:Class="namespace.CountryStandards"...

Answer 2

I did a complete cheat and used dynamic, probably breaks every rule in the book lol

        Assembly a = Assembly.GetExecutingAssembly(); //get this app

        List<dynamic> l = new List<dynamic>(); //create a list

        // this list is our objects as string names
        // this if the full namespace and class, not just the class name 
        // I've actually stored these in my database so that I can control
        // ordering and show/hide from the database
        foreach(var app in listApplications) 
        {
            l.Add(a.CreateInstance(app)); //add them to my list
        }

        //as all my objects are the same this still works, you just don't get 
        //Intellisync which I don't care about because I know what I'm sending
        //all my objects are autonomous and self-contained and know nothing of any other objects
        //i have a main window/code that marshals the controls and data and manages view navigation
        l[0].DoThatFunction({ status ="new", message ="start", value = 0});

And then on the class

    public void DoThatFunction(dynamic data)
    {
        MessageBox.Show(data.message);//place-holder code but i'm sure you get the idea
    }

I like this because is oh so loosely coupled. As I'm porting an old app from Winforms to WPF this suits me as I can literally just copy and paste any code that's compatible. It might be the wrong thing to do but it works and will save me a ton of rework.

Also makes testing easy as I can 100% focus on each control in turn