SimplePhotosApp/Photos/Views/MainWindow.axaml.cs

using Avalonia.Controls;
using Avalonia.Input;
using Avalonia.Xaml.Interactions.DragAndDrop;
using Photos.Models;
using Photos.ViewModels;

namespace Photos.Views;

public partial class MainWindow : Window
{
    private IFolderPickerService _folderPickerService;

    public MainWindow()
    {
        InitializeComponent();
        _folderPickerService = new FolderPickerService(this);
        DataContext = new MainWindowViewModel(_folderPickerService);
    }

    public void DropHandler(object sender, DragEventArgs e)
    {
        (DataContext as MainWindowViewModel)?.WindowDropHandler(e);
    }
}