AvaloniaProject/AvaloniaApplication4/Views/MainPage.axaml.cs

using Avalonia.Controls;
using AvaloniaApplication4.Models;
using AvaloniaApplication4.ViewModels;

namespace AvaloniaApplication4.Views
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            DataContext = new MainPageViewModel();
            InitializeComponent();
        }
        public MainPage(User? user)
        {
            DataContext = new MainPageViewModel(user);
            InitializeComponent();
        }
    }
}