Finding controls in WPF ControlTemplate

Question

I have created class that inherits from Window and I am applying control template to it:

public class BaseSearchWindow : Window { static BaseSearchWindow() { DefaultStyleKeyProperty.OverrideMetadata(typeof(BaseSearchWindow), new FrameworkPropertyMetadata(typeof(BaseSearchWindow))); } public BaseSearchWindow() { Uri uri = new Uri("/WPFLibs;component/Resources/StyleResources.xaml", UriKind.Relative); ResourceDictionary Dict = Application.LoadComponent(uri) as ResourceDictionary; this.Style = Dict["WindowTemplate"] as Style; }

Than I want to find some control in control template:

 public override void OnApplyTemplate() { RibbonCommand searchCommand = this.Template.FindName("searchCommand", this) as RibbonCommand; //doesn't work, searchCommand is null searchCommand.CanExecute += CanExecuteRibbonCommand; }

But it is allways null. I tried it in inherited class and it works, but I want it in my base class, so I don't have to search for it every time I use that class. This works:

public partial class MainWindow : BaseSearchWindow { public MainWindow() { InitializeComponent(); RibbonCommand searchCommand = this.Template.FindName("searchCommand", this) as RibbonCommand; searchCommand.CanExecute += CanExecuteRibbonCommand; }

Thomas Levesque · Accepted Answer · 2011-04-07 13:51:38Z

1

Using FindName in OnApplyTemplate is the correct way of doing it; I think it doesn't work because you forgot to call base.OnApplyTemplate().

answered Apr 7, 2011 at 13:51

Thomas Levesque

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2 Comments

Vale Over a year ago

I tried it already, doesn't work, although it should, at least in theory.

Vale Over a year ago

Yes, but not today, I am home now, I will post it as soon as I get to work tomorrow.

Emond · Accepted Answer · 2011-04-07 17:11:40Z

My bet is that you are looking for a command that doesn't exist (or has a different name) or isn't a RibbonCommand.

That or you didn't specify x:FieldModifier="protected" for the command in xaml.

No, because it works in extended class, as I stated in the question.

Vale · Accepted Answer · 2011-04-08 06:17:45Z

Actually, I made a mistake. When I try to find controls that are not RibbonCommands it worked, so now I find parent control first and than use VisualTreeHelper to find the RibbonCommand. Sorry about that, I was convinced that it worked only in extended class, but I guess I was too tired when I posted the question. Thank you for your help anyway.

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