avaloniaProjForMe/kuzminIVProjectWorkOnDemo/ViewModels/MainWindowViewModel.cs

using Avalonia.Controls;
using kuzminIVProjectWorkOnDemo.Models;
using ReactiveUI;

namespace kuzminIVProjectWorkOnDemo.ViewModels
{
    public class MainWindowViewModel : ViewModelBase
    {
        static KuzmintestprojContext db = new KuzmintestprojContext();
        //public string Greeting => "Welcome to Avalonia!";

        string adminkey;

        public string Adminkey { get => adminkey; set { adminkey = value; adminMethod(); } }

        private UserControl userControl = new ServiceListPage();

        public UserControl UserControl { get { return userControl; } set => this.RaiseAndSetIfChanged(ref userControl, value); }

        #region serviceList

        private ServiceListPageViewModel serviceListNewWM = new ServiceListPageViewModel(db);
        
        public ServiceListPageViewModel ServiceListPageWM { get => serviceListNewWM; set => serviceListNewWM = value; }

        #endregion

        void adminMethod()
        {
            if (Adminkey == "0000")
            {
                Models.Sevice.IsVisibleAdmin = true;
                UserControl = new ServiceListPage();

            }
            else
            {
                Models.Sevice.IsVisibleAdmin = false;
                UserControl = new ServiceListPage();
            }
        }
    }
}