MainWindow.xaml.cs

using Microsoft.Win32;
using PostSharp.Patterns.Collections;
using PostSharp.Patterns.Model;
using PostSharp.Patterns.Recording;
using PostSharp.Patterns.Threading;
using PostSharp.Patterns.Xaml;
using System.Windows;
using System.Windows.Input;

namespace PostSharp.Samples.Xaml
{
  /// <summary>
  ///   Interaction logic for MainWindow.xaml
  /// </summary>
  [NotifyPropertyChanged]
  public partial class MainWindow : Window
  {
    private readonly CustomerModel customer = new CustomerModel
    {
      FirstName = "Jan",
      LastName = "Novak",
      Addresses = new AdvisableCollection<AddressModel>
      {
        new AddressModel
        {
          Line1 = "Saldova 1G",
          Town = "Prague"
        },
        new AddressModel
        {
          Line1 = "Tyrsova 25",
          Town = "Brno"
        },
        new AddressModel
        {
          Line1 = "Pivorarka 154",
          Town = "Pilsen"
        }
      }
    };

    private readonly Recorder recorder;

    public MainWindow()
    {
      // We need to have a local reference for [NotifyPropertyChanged] to work.
      recorder = RecordingServices.DefaultRecorder;


      InitializeComponent();

      // Register our custom operation formatter.
      RecordingServices.OperationFormatter = new MyOperationFormatter(RecordingServices.OperationFormatter);

      // Create initial data.
      var customerViewModel = new CustomerViewModel { Customer = customer };

      customerViewModel.Customer.PrincipalAddress = customerViewModel.Customer.Addresses[0];

      // Clear the initialization steps from the recorder.
      recorder.Clear();

      DataContext = customerViewModel;
    }

    [Command]
    public ICommand SaveCommand { get; private set; }

    public bool CanExecuteSave => recorder.UndoOperations.Count > 0;

    private void ExecuteSave()
    {
      var openFileDialog = new SaveFileDialog();

      if (openFileDialog.ShowDialog().GetValueOrDefault())
      {
        SaveInBackground(openFileDialog.FileName);
      }
    }


    [Background]
    [DisableUI]
    private void SaveInBackground(string path)
    {
      customer.Save(path);
    }
  }
}