DontHarm/src/DontHarmDesktop/ViewModels/ServiceAddViewModel.cs

using Prism.Commands;
using Prism.Mvvm;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace DontHarmDesktop.ViewModels
{
    class ServiceAddViewModel : BindableBase
    {
        public string Name { get; set; }
        public float Price { get; set; }
        public string Code { get; set; }
        public DelegateCommand Submit { get; set; }

        public ServiceAddViewModel()
        {
            Submit = new DelegateCommand(SubmitExecuted);
        }

        public void SubmitExecuted()
        {
            // Валидация
            decimal price = (decimal)Price;
            List<string> errors = new List<string>();
            bool isValid = Validation.CheckService(Code, price, Name, errors);

            if (!isValid)
            {
                Validation.DisplayErrors(errors);
                return;
            }

            var service = new Models.services
            {
                name = Name,
                code = Code,
                price = (decimal)Price
            };
            var db = new DontHarmDesktop.Models.Entities();
            db.services.Add(service);
            db.SaveChanges();

            (App.Current.MainWindow as MainWindow).MainFrame.Navigate(new Pages.Services());
        }
    }
}