How to launch the simplest code illustrating Master-Detail (compound List) object databinding in WPF?

Question

I am trying to run (in C# 4.0, Visual Studio 2010) the code from

• Unable to display a List as one of the columns of my view with ItemsControl and StackPanel?

Answer 1

First of all myOrders has to be a public property. it cannot be seen even if it's a public variable, secondly to make the view(XAML) aware of what's going in the code behind you need to set DataContext = this; in the window's constructor

Set a property like this : public List myOrder {get;set;}

If you need to update the view from code behind then you need to implement INotifyPropertyChanged interface. it's responsible of doing update view job. Here is a small tutorial from MSDN.

Last thing, (From my experience) you should go with a property of type ObservableCollection instead of List.

XAML :

Code behind :

  /// 

    /// Interaction logic for MainWindow.xaml
    /// 
    public partial class MainWindow : Window, INotifyPropertyChanged
{
    public ObservableCollection MyOrders
    {
        get { return _myOrders; }
        set { _myOrders = value; OnPropertyChanged("MyOrders"); }
    }

    Order order1 = new Order
     {
         OrderName = "Order1",
         PartsList = new List()
        {
            new Parts {PartName = "Part11", PartQuantity = 11},
            new Parts {PartName = "Part12", PartQuantity = 12}
        }
     };

    private ObservableCollection _myOrders;

    public MainWindow()
    {
        InitializeComponent();
        MyOrders = new ObservableCollection();
        MyOrders.Add(order1);
        DataContext = this;
    }

    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChangedEventHandler handler = PropertyChanged;
        if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
    }
}
    public class Order
    {
        public string OrderName { get; set; }
        public List PartsList { get; set; }
    }

    public class Parts
    {
        public string PartName { get; set; }
        public double PartQuantity { get; set; }
        }
}