# C1.WPF.DataFilter.Filter.OnAttachedStateChanged

## Content

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<h1 id="C1_WPF_DataFilter_Filter_OnAttachedStateChanged_" data-uid="C1.WPF.DataFilter.Filter.OnAttachedStateChanged*">OnAttachedStateChanged Method
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<div class="markdown level0 conceptual"></div>



<a id="C1_WPF_DataFilter_Filter_OnAttachedStateChanged_" data-uid="C1.WPF.DataFilter.Filter.OnAttachedStateChanged*"></a>
<h4 id="C1_WPF_DataFilter_Filter_OnAttachedStateChanged_C1_WPF_DataFilter_AttachedFilterState_" data-uid="C1.WPF.DataFilter.Filter.OnAttachedStateChanged(C1.WPF.DataFilter.AttachedFilterState)">OnAttachedStateChanged(AttachedFilterState)</h4>
<div class="markdown level1 summary"><p>Calls when the filter state was changed.</p>
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<h5 class="declaration">Declaration</h5>
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  <pre><code class="lang-csharp hljs">protected virtual void OnAttachedStateChanged(AttachedFilterState previous)</code></pre>
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  <pre><code class="lang-vbnet hljs">Protected Overridable Sub OnAttachedStateChanged(previous As AttachedFilterState)</code></pre>
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<h5 class="parameters">Parameters</h5>
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      <th>Type</th>
      <th>Name</th>
      <th>Description</th>
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    <tr>
      <td><a class="xref" href="C1.WPF.DataFilter.AttachedFilterState.html">AttachedFilterState</a></td>
      <td><span class="parametername">previous</span></td>
      <td><p>Previous state value.</p>
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    </tr>
  </tbody>
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