#1,142 – Setting Attached Property Value from Code

You can change the value of an attached property for a given control from code by using the SetValue or SetCurrentValue methods.  You call these methods on the control that the property is attached to, passing in a reference to the property and the new value.  (SetCurrentValue is preferred, to avoid overwriting a local value).

Below, we set a value for MyAttProps.Important in XAML, but also wire up a Click event to allow changing the value from code.

        <Label x:Name="lblHi" Content="Hi there"
        <Button Content="Change Content"

In the code-behind, we use SetCurrentValue to change the value.

        private void Button_Click(object sender, RoutedEventArgs e)
            bool impValue = (bool)lblHi.GetValue(MyAttProps.ImportantProperty);

            lblHi.SetCurrentValue(MyAttProps.ImportantProperty, !impValue);

About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

One Response to #1,142 – Setting Attached Property Value from Code

  1. Pingback: Dew Drop – August 22, 2014 (#1840) | Morning Dew

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