WPF Basic Data Binding FAQ

re: WPF Basic Data Binding FAQ

BobStrogg — Tue, 24 Oct 2006 19:31:01 GMT

I've made a WPF demo that uses the Newton Game Dynamics physics engine to roll some things down the screen, all using databinding. You might want to check it out: http://chriscavanagh.wordpress.com/2006/10/23/wpf-2d-physics :)

re: WPF Basic Data Binding FAQ

wcsdkteam — Thu, 26 Oct 2006 21:00:23 GMT

Wow, that's a really cool demo, Chris! Somehow I really enjoy seeing the car rolling off the screen. :) Thanks for sharing! - Tina

re: WPF Basic Data Binding FAQ

SaravanaMV — Tue, 05 Dec 2006 16:13:52 GMT

Hi there, I'm trying hard to find out the event that will be raised when data binding. Example, I'm binding to a DataTable in a Dataset, and displaying the result using ListView. All I wanted to do is to construct a custom ContextMenu for each item in the ListView during data binding. The context menu content will vary from item to item (atleast the enabled property will change). At the moment I got the ContextMenu element for the ListView in XAML using ListView.ContextMenu element. Its showing the ContextMenu on each line item as expected, but since its referencing to a single context menu, any property change in MenuItem is reflected on each row.

Any thoughts?

Saravana

re: WPF Basic Data Binding FAQ

wcsdkteam — Wed, 06 Dec 2006 00:55:20 GMT

Hi Saravana,

I may be simplifying your problem but would something like the following work in your scenario?

<ListView.ContextMenu>

</ContextMenu>

</ListView.ContextMenu>

If not, perhaps you can send us a simplified version of your code so we can take a look.

Thanks,

Tina

re: WPF Basic Data Binding FAQ

Ben.Henderson — Mon, 13 Aug 2007 23:58:51 GMT

Tina, thanks so much for this FAQ. You really helped me over the hump in areas areas.

- Ben

re: WPF Basic Data Binding FAQ

johnds — Mon, 15 Jun 2009 11:37:43 GMT

Hi Tina,

I am struggling with WPF binding, trying to do the simplist thing, but it doesnt seem to work.

I have a simple WPF application, with a Window XAML and code behind, nothing unusual. In my code behind file, I have a public instance property of the Window class. I simply want to bind that property to the text of a textbox, bound TwoWay.

It's amazing, i just cant seem to get it to work!

How on earth do you bind custom properties of the containing class (Be-it an Window, UserControl, whatever), to UI elements which the class contains??????????????

re: Binding to a property of the containing class

Carole Snyder — Tue, 16 Jun 2009 18:51:10 GMT

Hi John,

I created a simple sample that binds a TextBox to a property called AString on a Window and binds a Label to the same property:

<Window x:Class="ThemeResource.Window1"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:local="clr-namespace:ThemeResource" (Change this value to match the namespace in your project}

Title="Window1" Height="300" Width="300">

<TextBox Text="{Binding RelativeSource={RelativeSource AncestorType={x:Type local:Window1}},

Path=AString, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>

</StackPanel>

</Window>

When you type into the textbox, AString changes, but the label content doesn't because the label doesn't know that the property changed. To notify Label that the property changes, I implemented INotifyPropertyChanged on my Window1 class:

public partial class Window1 : Window, INotifyPropertyChanged

{

public Window1()

{

InitializeComponent();

AString = "this is a string";

}

string s;

public string AString

{

get { return s; }

set

{

s = value;

OnPropertyChanged("AString");

}

#region INotifyPropertyChanged Members

public event PropertyChangedEventHandler PropertyChanged;

// Create the OnPropertyChanged method to raise the event

protected void OnPropertyChanged(string name)

{

PropertyChangedEventHandler handler = PropertyChanged;

if (handler != null)

{

handler(this, new PropertyChangedEventArgs(name));

}

#endregion

}

Hope that helps.

Carole

re: WPF Basic Data Binding FAQ

thrivingtoday — Sat, 20 Jun 2009 23:13:04 GMT

Tina,

Thanks for this article. I have an application that's essentially a master-detail application. My main window contains a TreeView. The details are viewed through several usercontrols. How do I bind the textboxes and listviews from the usercontrols to the SelectedItem of the Treeview?

Thanks.

John

re: WPF Basic Data Binding FAQ

Carole Snyder — Mon, 22 Jun 2009 18:59:53 GMT

Hi John,

You can bind the DataContext of your user controls to the selected item in the treeview like this:

<src:UserControl1 Grid.Row="5" DataContext="{Binding ElementName=Master, Path=SelectedItem}"/>

Then in the use control you can bind to properties of the selected object. For example, if your TreeView is bound to an object that has a property called Description, you can put the following in your user control to display Discription's value:

Hope that helps,

Carole