Troubleshooting: InvalidCastException

[jonpryor]

I wrote this up on Discord, and it should be massaged into documentation:

• https://discord.com/channels/732297728826277939/732297837953679412/1164976813513130014
• https://discord.com/channels/732297728826277939/732297837953679412/1165090944505368606

Context:

App has:

partial class DragListAdapter {
    public DragListAdapter(AWidget.ListView listView, LinTest.Files.DragListView element)
    {
        try
        {
            WrappedAdapter = ((AWidget.IWrapperListAdapter)_listView.Adapter).WrappedAdapter;
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex);
        }
    }
}

In Debug config build, it runs fine. In Release config, it throws:

V mono-stdout: # jonp: ERROR: System.InvalidCastException: Specified cast is not valid.
V mono-stdout:   at DragListView.Android.Renderers.DragListAdapter..ctor (Android.Widget.ListView listView, LinTest.Files.DragListView element) [0x00070] in <15a302750fe049359ec667fe1a08adbe>:0 

TL;DR: it fails in Release because a type is linked away. The fix/workaround is to use .JavaCast<T>():

WrappedAdapter = _listView.Adapter.JavaCast<AWidget.IWrapperListAdapter>().WrappedAdapter;