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POUpdating Custom Attached Property in Style Trigger with Setter
 

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    <p>I was trying out attached properties and style triggers hoping to learn more about it. I wrote a very simple WPF windows app with an attached property:</p> <pre><code> public static readonly DependencyProperty SomethingProperty = DependencyProperty.RegisterAttached( "Something", typeof(int), typeof(Window1), new UIPropertyMetadata(0)); public int GetSomethingProperty(DependencyObject d) { return (int)d.GetValue(SomethingProperty); } public void SetSomethingProperty(DependencyObject d, int value) { d.SetValue(SomethingProperty, value); } </code></pre> <p>And I was trying to update the 'Something' attached property with a property trigger defined in the button style section:</p> <pre><code> &lt;Window x:Class="TestStyleTrigger.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:TestStyleTrigger;assembly=TestStyleTrigger" Title="Window1" Height="210" Width="190"&gt; &lt;Window.Resources&gt; &lt;Style x:Key="buttonStyle" TargetType="{x:Type Button}"&gt; &lt;Style.Triggers&gt; &lt;Trigger Property="IsPressed" Value="True"&gt; &lt;Setter Property="local:Window1.Something" Value="1" /&gt; &lt;/Trigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; &lt;/Window.Resources&gt; &lt;Button Style="{StaticResource buttonStyle}"&gt;&lt;/Button&gt; &lt;/Window&gt; </code></pre> <p>However, I kept getting following compilation error:</p> <p>error MC4003: Cannot resolve the Style Property 'Something'. Verify that the owning type is the Style's TargetType, or use Class.Property syntax to specify the Property. Line 10 Position 29.</p> <p>I can't understand why it gives me this error because I did use the 'Class.Property' syntax in the tag of the section. Can any one tell me how can I fix this compilation error?</p>
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