test2/MainWindow.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace Lucoshko_App
{
    /// <summary>
    /// Логика взаимодействия для MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void addButton_Click(object sender, RoutedEventArgs e)
        {
            double i;
            if (deffect.Text == "" || title.Text == "")
            {
                Healper.ShowMessage("Поля пустые");
                return;
            }
            else if(!double.TryParse(deffect.Text, out i))
            {
                
                Healper.ShowMessage("Требуется указать число в поле деффекта");
                return;
            }

            try
            {
                MaterialType matType = new MaterialType();
                matType.DefectedPercent = Convert.ToDouble(deffect.Text);
                matType.Title = title.Text;
                TrySave.db.MaterialType.Add(matType);
                TrySave.TrySaveFunc();
                datagrid1.ItemsSource = TrySave.db.MaterialType.ToList();
            }
            catch (Exception ex)
            {
                Healper.ShowErrorMessage(ex.Message);
            }
        }

        private void OnLoad(object sender, RoutedEventArgs e)
        {
            datagrid1.ItemsSource = TrySave.db.MaterialType.ToList();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            int i;
            if(!int.TryParse(id.Text, out i))
            {
                Healper.ShowMessage("Поле должно быть числом");
                return;
            }
            var p1 = TrySave.db.Material.FirstOrDefault();
            if(p1.ID !=Convert.ToInt32(id.Text))
            {
                Healper.ShowMessage("Такого поля нет");
                return;
            }
            var dRow = TrySave.db.MaterialType.Where(w => w.ID == Convert.ToInt32(id.Text)).FirstOrDefault();
            dRow.Title = title.Text;
            dRow.DefectedPercent = Convert.ToDouble(deffect.Text);
            TrySave.db.SaveChanges();
            datagrid1.ItemsSource = TrySave.db.MaterialType.ToList();
        }
    }
}