MvvMAva/AvaloniaApplication4/ViewModels/MainWindowViewModel.cs

using Avalonia.Controls;
using Avalonia.Threading;
using AvaloniaApplication4.Models;
using ReactiveUI;
using System;



namespace AvaloniaApplication4.ViewModels
{
    public class MainWindowViewModel : ViewModelBase
    {


        UserControl _us = new Page1();   
        public UserControl Us
        {
            get => _us;
            set => this.RaiseAndSetIfChanged(ref _us, value);
        }

        Page1ViewModel _page1VM = new Page1ViewModel();  
        public Page1ViewModel Page1VM
        {
            get => _page1VM;
            set => _page1VM = value;
        }
        Page2ViewModel page2VM = new Page2ViewModel(); 
        public Page2ViewModel Page2VM
        {
            get => page2VM;
            set => page2VM = value;
        }
        public void ToPage2()  
        {
            Us = new Page2();
        }


        public void ToPage1()  
        {
            Us = new Page1();
        }


        public void proverka()
        {

            if (Page1VM.loginn == Model.login && Page1VM.pass == Model.parol)
            {
                Page1VM.Res = "Верный логин и пароль";
     
                Us = new Page2();
            }
            else if (Page1VM.loginn != Model.login || Page1VM.pass != Model.parol)
            {
                Page1VM.Res = "Неверный логин или пароль";
                Page1VM.IsButtonVisible = false;
                Page1VM.IsButtonVisible1 = true;
                Page1VM.IsButtonVisible2 = true;
                Page1VM.IsTBvis = true;
                Page1VM.CreateCaptha();
                Page1VM.count++;
            }




        }
        public void CheckCaptcha()
        {
            if (Page1VM.count != 2)
            {
                if (Page1VM.loginn == Model.login && Page1VM.pass == Model.parol)
                {

                    string captchaText = new string(Page1VM.stringChars);
                    if (Page1VM.enteredtext.ToLower() == captchaText.ToLower())
                    {
                        Page1VM.Res = "Верный логин и пароль";

                        Page1VM.Res1 = "Верный код капчи";

                        Us = new Page2();
                    }
                    else
                    {

                        Page1VM.Res1 = "Неверный код капчи";
                        Page1VM.count++;
                        Page1VM.CreateCaptha();
                    }



                }
                else
                {
                    Page1VM.Res = "Неверный логин или пароль";
                    Page1VM.CreateCaptha();
                    Page1VM.count++;
                }
            }
            else
            {
                Page1VM.Enabled = false;
                Page1VM.IsButtonVisible1 = false;
                Page1VM.IsButtonVisible2 = false;
                Page1VM.IsTBvis = false;
                DispatcherTimer timer = new DispatcherTimer();
                timer.Interval = new TimeSpan(0, 0, 10);
                timer.Tick += (sender, e) =>
                {
                    Page1VM.IsButtonVisible1 = true;
                    Page1VM.IsButtonVisible2 = true;
                    Page1VM.IsTBvis = true;
                    Page1VM.Enabled = true;
                    Page1VM.Login = "";
                    Page1VM.Password = 0;
                    Page1VM.Enteredt = "";
                    Page1VM.count = 0;

                    Page1VM.CreateCaptha();
                    timer.Stop();
                };
                timer.Start();


            }


        }

    }
}