Cannot add an controller for an Adw.ApplicationWindow object

[Winver10]

OS: Ubuntu 26.04.1 LTS
DE: Ubuntu on Wayland
Project Target Framework: net10.0

Problem

When I tried to add a Gtk.ShortcutController to an Adw.ApplicatonWindow, .NET told me that the:

I thought it meant it failed to add the controller to the window object. So I checked the piece of code:

using Adw;
using Gdk;
using Gtk;
using GObject;

[GObject.Subclass<Adw.ApplicationWindow>]
public partial class MainWindow
{ //Some method
    pratical void Initialze()
    {  //Some code
        var execwithroot = CallbackAction.New((widget, args) =>
        {
            Console.WriteLine("Execute a program here");
            return true;
        });
        var d = ShortcutController.New();
        d.AddShortcut(Shortcut.New(ShortcutTrigger.ParseString("<Enter>"), execwithroot));
        AddController(d);

        Console.WriteLine($"controller.Widget: {d.Widget}");
    }
}

C# Dev Took Kit and .NET gave no error on static checking.
And I don't know how to solve it.

I'm sure that there are GTK and Adwaita dev packages in my development environment, because the whole program can be compiled and run successfully excluding this error.

[badcel]

Hi, thanks for bringing this up!

There is one bug here in GirCore. The call to ShortcutTrigger.ParseString("<Enter>") should return null which it does not. It should return null because "<Enter>" is not a valid option (at least on my system). I don't know how to make this specific sample work as I'm not a GTK expert. Please check the GTK documentation or ask in the official support channels.

I opened bug #1601 for the constructor issue so the next GirCore release will contain the bugfix.

I made a similar sample to your code which output "execute program here" if you press enter in a given window with a shortcutcontroller though:

using System;
using Gtk;

var application = Adw.Application.New("org.gir.core", Gio.ApplicationFlags.FlagsNone);
application.OnActivate += (sender, args) =>
{
    var execwithroot = CallbackAction.New((widget, args) =>
    {
        Console.WriteLine("Execute a program here");
        return true;
    });
    var d = ShortcutController.New();
    var c = KeyvalTrigger.New(Gdk.Constants.KEY_Return, 0);
    var aa = Shortcut.New(c, execwithroot);
    d.AddShortcut(aa);
    
    var label = Gtk.Label.New("Hello world");
    var window = Gtk.ApplicationWindow.New((Adw.Application) sender);
    window.Title = "Window";
    window.SetDefaultSize(300, 300);
    window.SetChild(label);
    window.AddController(d);
    window.Show();
};

return application.RunWithSynchronizationContext(null);

I hope this helps.