Question

WPF, C# - Observable Collection Problem Displaying an ItemTemplate in WPF Listbox

Asked by: cardinalone

Using WPF, C# - binding an object to a WPF ListBox with a DataTemplate.

The goal is to declaratively bind an ObservableCollection class to a WPF ListBox. The LIstBox should display a collection of Images (PNG Files). The ObservableCollection class picks up image files via a FileWatcher and has a FUlLPath public property that is used to bind the SOURCE property of an IMAGE element.

However, the ListBox will not render the images. WHen I debug, the ObservableCollection class DOES populate with items, and I can access the FullPath property.

I found out via MSDN that to make my ObservableCOllection class get recognized in XAML, I had to add a namesspace in my Widnow declaration.
 
   xmlns:src="clr-namespace:Wpf_SomethingFishy"

and also a Resource for the class.

    <Window.Resources>
        <src:FishBooks x:Key="FishBooks"/>
...

because prior the ListBox
<ListBox ItemsSource="{Binding Source={StaticResource FishBooks}}

was getting a compile error :FishBooks...not found..."

But I still am not able to get the ListBox to render the class Collection items.

All COde is pasted below.

App.XAML
<Application x:Class="Wpf_SomethingFishy.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    StartupUri="Window1.xaml">
</Application>
 
APP.XAML CODE BEHIND
using System;
using System.ComponentModel;
using System.IO;
using System.IO.IsolatedStorage;
using System.Threading;
using System.Windows;
using System.Windows.Data;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Threading;
 
 
namespace Wpf_SomethingFishy
{
    public partial class App : Application
    {
        public App()
        {
            InitializeComponent();
 
        }
    }
}
 
 
 
FISHBOOK CLAss
using System;
using System.IO;
 
namespace Wpf_SomethingFishy
{
    public class FishBook
    {
        string name;
        DateTime dateTime;
        string size;
        string path;
 
        public FishBook(string filename)
        {
            FileInfo info = new FileInfo(filename);
            size = (info.Length / 1024).ToString("N0") + " KB";
            dateTime = info.LastWriteTime;
            name = info.Name;
            path = info.DirectoryName;
        }
 
        public string Name
        {
            get { return name; }
        }
 
        public DateTime DateTime
        {
            get { return dateTime; }
        }
 
        public string Size
        {
            get { return size; }
        }
 
        public string Path
        {
            get { return path; }
        }
 
        public string FullPath
        {
            get { return System.IO.Path.Combine(Path, Name); }
        }
 
        public override string ToString()
        {
            return FullPath;
        }
    }
}
 
 
FISHBOOKS Class
using System;
using System.IO;
using System.Collections.Generic;
using System.Collections.ObjectModel;
 
namespace Wpf_SomethingFishy
{
    public class FishBooks : ObservableCollection<FishBook>
    {
        Dictionary<string, FileSystemWatcher> watchers = new Dictionary<string, FileSystemWatcher>();
 
        public event EventHandler ItemsUpdated;
 
        protected override void ClearItems()
        {
            base.ClearItems();
            watchers.Clear();
        }
 
        protected override void InsertItem(int index, FishBook item)
        {
            base.InsertItem(index, item);
            if (!watchers.ContainsKey(item.Path))
            {
                FileSystemWatcher watcher = new FileSystemWatcher(item.Path, "*.png");
                watcher.EnableRaisingEvents = true;
                watcher.Created += new System.IO.FileSystemEventHandler(OnPhotoCreated);
                watcher.Deleted += new System.IO.FileSystemEventHandler(OnPhotoDeleted);
                watchers.Add(item.Path, watcher);
            }
        }
 
 
        void OnPhotoDeleted(object sender, System.IO.FileSystemEventArgs e)
        {
            int index = -1;
            for (int i = 0; i < Items.Count; i++)
            {
                if (Items[i].FullPath == e.FullPath)
                {
                    index = i;
                    break;
                }
            }
            if (index >= 0)
                Items.RemoveAt(index);
 
            if (ItemsUpdated != null)
                ItemsUpdated(this, new EventArgs());
        }
 
        void OnPhotoCreated(object sender, System.IO.FileSystemEventArgs e)
        {
            Items.Add(new FishBook(e.FullPath));
 
            if (ItemsUpdated != null)
                ItemsUpdated(this, new EventArgs());
        }
    }
}
 
 
FISH CONTROLLER CLass
 
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.ComponentModel;
using System.IO;
using System.Threading;
using System.Windows.Threading;
 
namespace Wpf_SomethingFishy
{
    public class FishController
    {
        public FishController()
        {
              FishBooks fishbks = new FishBooks();
 
            foreach (string s in Directory.GetFiles(Environment.GetFolderPath(Environment.SpecialFolder.MyPictures).ToString() + System.IO.Path.DirectorySeparatorChar + "Fish", "*.png"))
                {
//               fishbks.ItemsUpdated += delegate { this.Dispatcher.Invoke(DispatcherPriority.Normal, new ThreadStart(Refresh)); };
                 FishBook fish = new FishBook(s);
                 fishbks.Add(fish);
                }
        }
 
 
    }
}
 
 
WINDOW1.XAML
 
<Window x:Class="Wpf_SomethingFishy.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:src="clr-namespace:Wpf_SomethingFishy"
    Title="Under the Sea" Height="750" Width="590" WindowStyle="SingleBorderWindow" Background="Transparent">
    <Window.Resources>
        <src:FishBooks x:Key="FishBooks"/>
        <LinearGradientBrush x:Key="ButtonBrushOrange" StartPoint="0,0" EndPoint="0,1">
            <GradientStop Offset="0.45" Color="Orange" />
            <GradientStop Offset="0.45" Color="Orange" />
            <GradientStop Offset="0.6" Color="DarkOrange" />
            <GradientStop Offset="0.9" Color="DarkOrange" />
        </LinearGradientBrush>
        <LinearGradientBrush x:Key="ButtonBrushBlack" StartPoint="0,0" EndPoint="0,1">
            <GradientStop Offset="0.45" Color="DarkSlateGray"  />
            <GradientStop Offset="0.45" Color="DarkSlateGray" />
            <GradientStop Offset="0.6" Color="Black" />
            <GradientStop Offset="0.9" Color="Black" />
        </LinearGradientBrush>
        <ControlTemplate x:Key="buttonControlTemplate">
            <Grid Width="150" Height="Auto" >
                <Ellipse x:Name="Disc" Width="125" Height="125" Fill="{StaticResource ButtonBrushBlack}"></Ellipse>
                <Viewbox>
                    <ContentPresenter Margin="1" Content="{TemplateBinding Button.Content}"/>
                </Viewbox>
            </Grid>
        </ControlTemplate>
        <HierarchicalDataTemplate DataType="NavItems" ItemsSource="{Binding XPath=*}">
            <StackPanel Orientation="Horizontal">
                <Image Source="Fish\shiirafish.png" Height="42" Width="42" Margin="0,0,5,0"/>
                <TextBlock Foreground="White" FontStyle="Normal" FontFamily="Calibri" FontSize="12" Text="{Binding XPath=@Header}"/>
            </StackPanel>
        </HierarchicalDataTemplate>
        <HierarchicalDataTemplate DataType="NavItem" ItemsSource="{Binding XPath=*}">
            <StackPanel Orientation="Horizontal">
                <Image Source="Fish\babelfish.png" Height="42" Width="42" Margin="0,0,5,0"/>
                <TextBlock Foreground="White" FontStyle="Normal" FontFamily="Calibri" FontSize="12" Text="{Binding XPath=@Type}"/>
            </StackPanel>
        </HierarchicalDataTemplate>
        <HierarchicalDataTemplate DataType="NavItem1" ItemsSource="{Binding XPath=*}">
            <StackPanel Orientation="Horizontal">
                <Image Source="Fish\redFish.png" Height="42" Width="42" Margin="0,0,5,0"/>
                <TextBlock Foreground="White" FontStyle="Normal" FontFamily="Calibri" FontSize="12" Text="{Binding XPath=@SubType}"/>
            </StackPanel>
        </HierarchicalDataTemplate>
        <HierarchicalDataTemplate DataType="Fish" ItemsSource="{Binding XPath=*}">
            <StackPanel Orientation="Horizontal">
                <Image Source="Fish\fish-1.png" Height="42" Width="42" Margin="0,0,5,0"/>
                <TextBlock Foreground="White" FontStyle="Normal" FontFamily="Calibri" FontSize="12" Text="{Binding XPath=Fish}"/>
            </StackPanel>
        </HierarchicalDataTemplate>
        <XmlDataProvider x:Key="BlueDataProvider" XPath="NavItems" Source="BlueNavItems.xml" />
        <Style TargetType="TreeViewItem">
            <Setter Property="IsExpanded" Value="True" />
        </Style>
    </Window.Resources>
    
    <Grid Background="{StaticResource ButtonBrushOrange}">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="220"/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <StackPanel Grid.Row="0" VerticalAlignment="Top" Height="155">
        <WrapPanel  HorizontalAlignment="Left" Grid.Column="0" >
        <Button Template="{StaticResource buttonControlTemplate}" Click="btnGo_Click" >
            <Image Source="Fish\diver.png" Height="9" Width="9" />
        </Button>
        </WrapPanel>
        </StackPanel>
        <StackPanel Margin="0,161,0,0" Grid.RowSpan="2">
            <TreeView x:Name="treeViewBlue" Grid.Row="1" Foreground="Blue" Background="{StaticResource ButtonBrushOrange}" ItemsSource="{Binding Source={StaticResource BlueDataProvider}, XPath=.}" >
            </TreeView>
        </StackPanel>
        <StackPanel Name="ListStackPanel" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Grid.Row="0" Grid.RowSpan="2" Grid.Column="2" Grid.ColumnSpan="1" >
            <ListBox x:Name="fishBox" BorderThickness="2" BorderBrush="Black"  
                     ScrollViewer.VerticalScrollBarVisibility="Visible" ScrollViewer.HorizontalScrollBarVisibility="Disabled"
                     ItemsSource="{Binding Source={StaticResource FishBooks}}" Height="45">
                <ListBox.ItemsPanel>
                    <ItemsPanelTemplate>
                        <WrapPanel Background="Blue"  />
                    </ItemsPanelTemplate>
                </ListBox.ItemsPanel>
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <Grid>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="55" />
                                <RowDefinition/>
                                <RowDefinition/>
                            </Grid.RowDefinitions>
                            <Image Source="Fish\diver.png" Height="35" Grid.Row="0" />
                        </Grid>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>
        </StackPanel>
    </Grid>
</Window>
 
 
 
WINDOW1.XAML.CS
 
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.ComponentModel;
using System.IO;
using System.IO.IsolatedStorage;
using System.Threading;
using System.Windows.Threading;
 
 
 
namespace Wpf_SomethingFishy
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window
    {
        ScaleTransform st = new ScaleTransform(3, 3);
//        object dummyNode = null;
 
        #region Window Management
 
        public Window1()
        {
            InitializeComponent();
            FishController fishcontroller = new FishController();
        }
 
        #endregion Window Management
 
 
 
 
        #region Button Events
 
        void btnGo_Click(object sender, RoutedEventArgs e)
        {
            //             AddPhotosInFolder();
         }
 
 
        #endregion Button Events
 
 
    }
 
}
 
 
BBLUE NAV ITEMS.XML - This binds via Hiearchical DataTempalte and it works
 
<?xml version="1.0" encoding="utf-8" ?>
<NavItems Header="Blue Ocean Fish">
  <NavItem Type="Big Fish">
    <NavItem1 SubType="Friendly Fish ">
        <Fish>Bottom Fish</Fish>
      </NavItem1>
    <NavItem1 SubType="Deep Sea Fish">
      <Fish>Bottom Fish</Fish>
    </NavItem1>
  </NavItem>
  <NavItem Type="Little Fish">
    <NavItem1 SubType="Friendly Fish ">
      <Fish>Bottom Fish</Fish>
    </NavItem1>
    <NavItem1 SubType="Deep Sea Fish ">
      <Fish>Bottom Fish</Fish>
    </NavItem1>
  </NavItem>
</NavItems>
 
 
The PING files in the attached ZIP were also RESOURCES in the solution so they can be used as icons for the TreeView items.

                                  
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  • Fish.zip
    • 157 KB

    PNG FILES - used as source for the ListBox binding

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Asked On
2009-07-21 at 20:45:31ID24589729
Tags

WPF

,

C#

,

XAML

,

Observable Collection

,

Object Binding

Topics

WPF and Silverlight

,

Microsoft Visual C#.Net

Participating Experts
1
Points
500
Comments
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Answers

 

by: unmeshdavePosted on 2009-07-21 at 23:51:26ID: 24912050

regarding the collection, I already gave reply to

http://www.experts-exchange.com/Microsoft/Development/Microsoft_Programming/WPF_and_Silverlight/Q_24586234.html#a24911984  

and to get images in listbox you can replace textblock in datatemplate with following


<Image Source="{Binding Path=FullPath}" Height="35" Grid.Row="0" />  

<ListBox x:Name="fishBox" BorderThickness="2" BorderBrush="Black"  
                     ScrollViewer.VerticalScrollBarVisibility="Visible" ScrollViewer.HorizontalScrollBarVisibility="Disabled"
                     ItemsSource="{Binding Source={StaticResource FishBooks}}" Height="250" >
                <ListBox.ItemsPanel>
                    <ItemsPanelTemplate>
                        <WrapPanel Background="Blue"  />
                    </ItemsPanelTemplate>
                </ListBox.ItemsPanel>
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <!--<Grid>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="55" />
                                <RowDefinition />
                                <RowDefinition />
                            </Grid.RowDefinitions>-->
                            <!--<TextBlock Background="Aqua" >
                                <TextBlock.Text>
                                    <Binding Path="Path"/>
                                </TextBlock.Text>
                            </TextBlock>-->
                            <Image Source="{Binding Path=FullPath}" Height="35" Grid.Row="0" />
                        <!--</Grid>-->
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>

                                              
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20120131-EE-VQP-002

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98% positive feedback on 31,087 answers since March 2000. angeliii is a Microsoft Most Valuable Professional for his work with MS SQL Server & Develoment.

He has also proven his knowledge of Visual Basic Programming, PHP Scripting and Oracle Databases.

The Experts

97% positive feedback on 10,752 answers since July 2000. lrmoore has more than 18 years experience in the networking industry.

The six-time Mircosoft MVPs specialties include firewalls, virtual private networking, and network management.

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