Migrating an UWP app based on MVVM to WinUI in Desktop

[VigneshVoid]

Similar to this sample https://github.com/microsoft/InventorySample we are migrating from UWP to WinUI in Desktop. But we are facing issues in this initial stage

1. Getting current window id.
   used this API in UWP . ApplicationView.GetForCurrentView().Id.
   Tried this in app sdk. AppWindow.id but it is not accesible
   Replacement for this in WindowsAppSDK ?
2. Showing MessageDialog Even from ViewModel not from View. Which needs window Instance

[VigneshVoid]

We resolved by both the issue by getting windowhandle. We have created a simple WindowHelper to address in every stage of View and ViewModel.

public class WindowHelper
    {
        public static Window CurrentWindow { get; set; }

        public static int CurrentWindowId { get; set; }

        public static AppWindowTitleBar TitleBar { get; set; }

        public static void LoadWindow(Window window)
        {
            CurrentWindow = window;
            IntPtr windowHandle = WinRT.Interop.WindowNative.GetWindowHandle(CurrentWindow);
            WindowId id = Win32Interop.GetWindowIdFromWindow(windowHandle);
            CurrentWindowId = (int)id.Value;
            TitleBar = AppWindow.GetFromWindowId(id).TitleBar;
        }

        public static IAsyncOperation<IUICommand> ShowMessageDialogAsync(string content, List<UICommand> commands = null, string title = null)
        {
            MessageDialog dialog;
            dialog = new MessageDialog(content);
            if(!string.IsNullOrEmpty(title))
            {
                dialog.Title = title;
            }
            if(commands != null)
            {
                foreach (var command in commands)
                {
                    dialog.Commands.Add(command);
                }
            }
            IntPtr WindowHandle = WinRT.Interop.WindowNative.GetWindowHandle(CurrentWindow);
            WinRT.Interop.InitializeWithWindow.Initialize(dialog, WindowHandle);
            return dialog.ShowAsync();
        }
    }

Hope this helps anyone who's looking at this in future