exam_prepare/ViewModels/CartViewModel.cs

using examPrepare.Models;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace examPrepare.ViewModels
{
  public class CartViewModel : INotifyPropertyChanged
  {
    private List<ProductModel> _products = new List<ProductModel>();
    public List<ProductModel> Products { 
      get { return _products; }
      set {  _products = value; OnPropertyChanged("Products"); }
    }
    public void notifyChange() { OnPropertyChanged("Products"); }
    public CartViewModel()
    {
      List<Product> rawProcuts = GlobalInfo.conn.Product.ToList();
      foreach (Product product in rawProcuts)
      {
        if (GlobalInfo.cart.ContainsKey(product.ProductArticleNumber))
        {
          ProductModel p = new ProductModel(product);
          p.count = GlobalInfo.cart[product.ProductArticleNumber]; 
          _products.Add(p);
        }
      }
    }
    public event PropertyChangedEventHandler PropertyChanged;
    protected void OnPropertyChanged(string propertyName)
    {
      PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
  }
}