I have two questions about developing at Windows Phone:
I want to create custom control and be able to provide some extra XAML inside it. So I use ContentControl
with ContentPresenter
inside ControlTemplate
.
<ContentControl>
<ControlTemplate>
<TextBlock Name="TextBlockControl" Text="Existing controls"/>
<ContentPresenter/>
</ControlTemplate>
</ContentControl>
It worked, but I can't access TextBlockControl
inside ControlTemplate
from code-behind. FindName
always returns null.
Secondly, I want to provide attributes for Control, so I create DependencyProperty like this:
public string CustomText
{
get { return (string)GetValue(CustomTextProperty); }
set
{
SetValue(CustomTextProperty, value);
TextBlockControl.Text = value;
}
}
public static readonly DependencyProperty CustomTextProperty =
DependencyProperty.Register("CustomText", typeof(string), typeof(MyControl), null);
As you can see, I write TextBlockControl.Text = value;
to set text for TextBlock inside of my Control. When I set static string - it works
<MyControl CustomText="Static Text"/>
But when I want to use Binding
(eg for LocalizedStrings
resource) - it doesn't work. Am i missing PropertyMeta Callback, or some IPropertyChanged inheritance? I have read tons of StackOverflow questions with the same issue, but nothing answered my questions.
the answer to the first question :
If you créate your custom-control, and you assign a template, you can Access to the elements in that template using :
[TemplatePart(Name = "TextBlockControl", Type = typeof(FrameworkElement))]
You have to put this attribute in order to tools like blend, know that the template for this custom-control has to have a textblock called TextBlockControl.Then from the control's OnApplyTemplate you should get a reference to it whit :
protected override void OnApplyTemplate()
{
_part1 = this.GetTemplateChild("TextBlockControl") as FrameworkElement;
base.OnApplyTemplate();
}
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