AvaloniaDB/TeacheresAndCourses/ViewModels/AddCourseViewModel.cs

using System;
using System.Collections.Generic;
using ReactiveUI;
using TeacheresAndCourses.Models;

namespace TeacheresAndCourses.ViewModels
{
	internal class AddCourseViewModel : ViewModelBase
	{
		Course? newCourse;
		string courseTitle;
		int courseHours;
        public AddCourseViewModel()
        {
            newCourse = new Course();
        }

        public Course NewCourse { get => newCourse; set => this.RaiseAndSetIfChanged(ref newCourse, value); }
        public string CourseTitle { get => courseTitle; set => this.RaiseAndSetIfChanged(ref courseTitle, value); }
        public int CourseHours { get => courseHours; set => this.RaiseAndSetIfChanged(ref courseHours, value); }

        public void AddCourse()
		{
            if (CourseTitle!=null && CourseHours!=null)
            {
                NewCourse.Title = CourseTitle + " - " + courseHours + " ÷àñîâ";
            }
            MainWindowViewModel.connection.Courses.Add(NewCourse);
            MainWindowViewModel.connection.SaveChanges();
            MainWindowViewModel.Instance.Uc = new AddTeacher();
        }
        public void ToMainPage()
        {
            MainWindowViewModel.Instance.Uc = new TeachersPage();
        }
    }
}