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PORefresh WPF Command
 

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    <p>Does anyone know how I can force <code>CanExecute</code> to get called on a custom command (Josh Smith's <a href="http://msdn.microsoft.com/en-us/magazine/dd419663.aspx" rel="noreferrer"><code>RelayCommand</code></a>)?</p> <p>Typically, <code>CanExecute</code> is called whenever interaction occurs on the UI. If I click something, my commands are updated. </p> <p>I have a situation where the condition for <code>CanExecute</code> is getting turned on/off by a timer behind the scenes. Because this is not driven by user interaction, <code>CanExecute</code> is not called until the user interacts with the UI. The end result is that my <code>Button</code> remains enabled/disabled until the user clicks on it. After the click, it is updated correctly. Sometimes the <code>Button</code> appears enabled, but when the user clicks it changes to disabled instead of firing.</p> <p>How can I force an update in code when the timer changes the property that affects <code>CanExecute</code>? I tried firing <code>PropertyChanged</code> (<code>INotifyPropertyChanged</code>) on the property that affects <code>CanExecute</code>, but that did not help.</p> <p>Example XAML:</p> <pre class="lang-xml prettyprint-override"><code>&lt;Button Content="Button" Command="{Binding Cmd}"/&gt; </code></pre> <p>Example code behind:</p> <pre class="lang-cs prettyprint-override"><code>private ICommand m_cmd; public ICommand Cmd { if (m_cmd == null) m_cmd = new RelayCommand( (param) =&gt; Process(), (param) =&gt; EnableButton); return m_cmd; } // Gets updated from a timer (not direct user interaction) public bool EnableButton { get; set; } </code></pre>
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    1. CODid you try to raise INotifyPropertyChanged for the Command? You don't need to have a field for the Command, just return new one each time. This combination should work. Or create new Command only for the case when you need the forcing.
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