WPF

Christian Graus wrote:

this is a programming forum, not a meeting place for punk rap wannabes

Mark Salsbery
Microsoft MVP - Visual C++

Bijesh wrote:

I think this is because a property change on an individual item does not fire a collection changed event in the ObservableCollection.

Mark Salsbery
Microsoft MVP - Visual C++

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
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;
using System.Windows.Media.Media3D;
using System.ComponentModel;
using System.Collections.ObjectModel;

namespace ModelVisualTest
{
  /// <summary>
  /// Interaction logic for Window1.xaml
  /// </summary>
  public partial class Window1 : Window
  {
    private ObservableCollection<Person> _people;
    public Window1()
    {
      InitializeComponent();
    }

    private void BuildModel()
    {
      _people = new ObservableCollection<Person>();
      _people.Add(new Person() { Forename = "Peter", Surname = "O'Hanlon", Age = 30 });
      _people.Add(new Person() { Forename = "Josh", Surname = "Walton", Age = 29 });
      _people.Add(new Person() { Forename = "William", Surname = "Hill", Age = 28 });
      _people.Add(new Person() { Forename = "Joseph", Surname = "Brannagan", Age = 36 });

      dataGrid1.ItemsSource = _people;
    }

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
      BuildModel();
    }
  }

  public class Person : INotifyPropertyChanged
  {
    private string _forename;
    public string Forename
    {
      get { return _forename; }
      set
      {
        if (_forename != value)
        {
          _forename = value;
          OnChanged("Forename");
        }
      }
    }
    private string _surname;
    public string Surname
    {
      get { return _surname; }
      set
      {
        if (_surname != value)
        {
          _surname = value;
          OnChanged("Surname");
        }
      }
    }
    private int _age;
    public int Age
    {
      get { return _age; }
      set
      {
        if (_age != value)
        {
          _age = value;
          OnChanged("Age");
        }
      }
    }
    #region INotifyPropertyChanged Members

    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnChanged(string p)
    {
      PropertyChangedEventHandler handler = PropertyChanged;
      if (handler != null)
      {
        handler(this, new PropertyChangedEventArgs(p));
      }
    }
    #endregion
  }
}

<Window x:Class="ModelVisualTest.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300" xmlns:my="http://schemas.microsoft.com/wpf/2008/toolkit"
    Loaded="Window_Loaded" >
    <Grid>
        <my:DataGrid x:Name="dataGrid1" AutoGenerateColumns="True" />
    </Grid>
</Window>