how can I bind properties of an object that is already a property of an already bound object?

Question

I'm having a problem trying to bind the properties of an object, that is already a property of another object. When I bind the properties of the upper object, everything goes ok, but when I try to bind the properties of one property, it doesn't display anything.

Here is my code: xaml

    
    
        
            
                
            
            
                
                    
                        
                            Transponder
                        
                    
                    
                        
                            Tipo
                        
                    
                    
                        
                            Destruida
                        
                    
                    
                        
                            Combustible
                        
                        
                            

                                
                                    
                                        White

And the c# code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Media;

namespace WpfTutorialSamples.ListView_control
{
    public partial class ListViewColumnSortingSample : Window
    {
        private GridViewColumnHeader listViewSortCol = null;
        private SortAdorner listViewSortAdorner = null;

        public ListViewColumnSortingSample()
        {
            InitializeComponent();
            List items = new List();
            items.Add(new User() { Transponder = "M001", Tipo = "UH60", Destruida = Estado_Aeronave.Destruida, combustible = new Combustible() {Cargado = 4000, Usado = 3000} });
            items.Add(new User() { Transponder = "M002", Tipo = "UH70", Destruida = Estado_Aeronave.Funcional, combustible = new Combustible() { Cargado = 3000, Usado = 2000 } });
            items.Add(new User() { Transponder = "M003", Tipo = "UH80", Destruida = Estado_Aeronave.Funcional, combustible = new Combustible() { Cargado = 2000, Usado = 1000 } });
            items.Add(new User() { Transponder = "M004", Tipo = "UH90", Destruida = Estado_Aeronave.Destruida, combustible = new Combustible() { Cargado = 1000, Usado = 500 } });
            lvUsers.ItemsSource = items;
        }

        private void lvUsersColumnHeader_Click(object sender, RoutedEventArgs e)
        {
            GridViewColumnHeader column = (sender as GridViewColumnHeader);
            string sortBy = column.Tag.ToString();
            if (listViewSortCol != null)
            {
                AdornerLayer.GetAdornerLayer(listViewSortCol).Remove(listViewSortAdorner);
                lvUsers.Items.SortDescriptions.Clear();
            }

            ListSortDirection newDir = ListSortDirection.Ascending;
            if (listViewSortCol == column && listViewSortAdorner.Direction == newDir)
                newDir = ListSortDirection.Descending;

            listViewSortCol = column;
            listViewSortAdorner = new SortAdorner(listViewSortCol, newDir);
            AdornerLayer.GetAdornerLayer(listViewSortCol).Add(listViewSortAdorner);
            lvUsers.Items.SortDescriptions.Add(new SortDescription(sortBy, newDir));
        }



        private void ComboBox_StopChanges(object sender, SelectionChangedEventArgs e)
        {
            ComboBox snd = sender as ComboBox;
            snd.SelectedIndex = -1;
        }
    }

    public enum Estado_Aeronave { Destruida, Funcional };

    public class Combustible
    {
        public int Cargado { get; set; }
        public int Usado { get; set; }
    }

    public class User
    {
        public string Transponder { get; set; }

        public string Tipo { get; set; }

        public Estado_Aeronave Destruida { get; set; }

        public Combustible combustible { get; set; }
    }

    public class SortAdorner : Adorner
    {
        private static Geometry ascGeometry =
                Geometry.Parse("M 0 4 L 3.5 0 L 7 4 Z");

        private static Geometry descGeometry =
                Geometry.Parse("M 0 0 L 3.5 4 L 7 0 Z");

        public ListSortDirection Direction { get; private set; }

        public SortAdorner(UIElement element, ListSortDirection dir)
            : base(element)
        {
            this.Direction = dir;
        }

        protected override void OnRender(DrawingContext drawingContext)
        {
            base.OnRender(drawingContext);

            if (AdornedElement.RenderSize.Width < 20)
                return;

            TranslateTransform transform = new TranslateTransform
                    (
                            AdornedElement.RenderSize.Width - 15,
                            (AdornedElement.RenderSize.Height - 5) / 2
                    );
            drawingContext.PushTransform(transform);

            Geometry geometry = ascGeometry;
            if (this.Direction == ListSortDirection.Descending)
                geometry = descGeometry;
            drawingContext.DrawGeometry(Brushes.Black, null, geometry);

            drawingContext.Pop();
        }
    }
}

If you could help I would forever be thankful to you.

Have a nice day.

shofstetter · Accepted Answer

Set the DataContext to the actual attribute name:

And the TextBox Bindings to the according members:

how can I bind properties of an object that is already a property of an already bound object?

Answers (2)

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