I tried to create a user control as:
public partial class MyTextBlock : UserControl
{
public MyTextBlock()
{
InitializeComponent();
}
public static readonly DependencyProperty LabelProperty
= DependencyProperty.Registe开发者_运维问答rAttached("Label", typeof(string), typeof(MyTextBlock), null);
public string Label
{
get { return (string)GetValue(LabelProperty); }
set { SetValue(LabelProperty, value); }
}
public static readonly DependencyProperty MyTextProperty
= DependencyProperty.RegisterAttached("MyText", typeof(string), typeof(MyTextBlock), null);
public string MyText
{
get { return (string)GetValue(MyTextProperty); }
set { SetValue(MyTextProperty, value); }
}
}
And its xaml is:
<Grid x:Name="LayoutRoot">
<TextBlock x:Name="Title" Text="{Binding Label}" />
<TextBlock x:Name="MyText" Text="{Binding MyText}" TextWrapping="Wrap"/>
</Grid>
Want I want is trying to binding dependency property in this control to UI elements, so that when i use this control, I can set data binding like:
<local:MyTextBlock Label="{Binding ....}" MyText = "{Binding ....}" />
But When I did as above, it's not working. No data bound, no error. How to fix it?
- Trying using .Register instead of .RegisterAttached on the DependencyProperty
- You need to provide a callback to set the value
- I think the 'int' type should be 'string'
putting it all together
public partial class MyTextBlock : UserControl
{
public MyTextBlock()
{
InitializeComponent();
}
public static readonly DependencyProperty LabelProperty
= DependencyProperty.Register("Label", typeof(string), typeof(MyTextBlock), new PropertyMetadata(new PropertyChangedCallback(LabelChanged)));
public string Label
{
get { return (string)GetValue(LabelProperty); }
set { SetValue(LabelProperty, value); }
}
private static void LabelChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var c = d as MyTextBlock;
if (c != null )
{
c.label.Text = e.NewValue as string;
}
}
}
Basically you just have to wrap those dependency properties in a class. Set the DataContext
on your control to an instance of that class and bind away.
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