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POAttach event handlers to controls within a data template
 

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    <p>I have a list box in WPF which displays the status of a number of worker threads. Included in the display is a progress bar.</p> <p>It turns out that progress bars have an issue (defect?): the "Maximum" value is a dependency property, but the progress bar does not update when this property changes.</p> <p>Somebody encounted a similar problem in <a href="https://stackoverflow.com/questions/655780/progressbar-not-updating-on-change-to-maximum-through-binding">this question</a>. The suggested solution is to add a handler to the progress bar that deals with the dependency property changing.</p> <p>But my progress bar is created by the WPF framework through a data template. (See code below) How could I attach a handler to these dynamically created progress bars?</p> <p>Or, is there another way to solve this problem?</p> <pre><code> &lt;DataTemplate x:Key="DataTemplateTransferWorker"&gt; &lt;Border Style="{StaticResource TransferWorker}" Height="Auto"&gt; &lt;StackPanel Orientation="Vertical"&gt; &lt;TextBlock Style="{StaticResource ItemHeader}"&gt;Transfer Worker&lt;/TextBlock&gt; &lt;TextBlock Style="{StaticResource FieldValue}" Text="{Binding StatusDescription}" /&gt; &lt;!-- Note that the maximum comes from a changing property. --&gt; &lt;ProgressBar Margin="6, 3, 6, 3" Height="12" Orientation="Horizontal" Background="Transparent" Maximum="{Binding ServerJob.FileSize, Mode=OneWay}" Value="{Binding BytesUploaded, Mode=OneWay}" /&gt; </code></pre> <p><hr /> <strong>Later Edit</strong></p> <p>It turns out that it's not as simple as the Maximum binding value being broken, because there are working examples where progress bars dynamically updates perfectly well.</p> <p>It wasn't an INotifyPropertyChanged issue. I was notifying of any changes to the ServerJob property, (but not the ServerJob.FileSize property which is constant for each server job.) I also put a breakpoint on ServerJob.FileSize.get, and the framework was indeed querying the filesize in response to the property changed notification.</p> <p>I also added two TextBlocks to the control, bound to ServerJob.FileSize and BytesUploaded respectively. And they updated exactly as they should.</p> <p>But for some reason, as soon as the BytesUploaded value became non-zero the progress bar would zoom to 100%. </p> <p>I've worked around the problem by adding a new property "PercentageComplete" which calculates the progress, and that way I can keep the maximum at a constant value of 100.</p>
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    1. USAndrew Shepherd
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    1. COThis is strange - I *can* update the progress bar by changing the value `Maximum` is bound from. Are you raising PropertyChanged in the setter? What .NET version are you using?
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      1. USGreg Sansom
    2. COYou can download my test project if you want to see it working - https://docs.google.com/leaf?id=0BxSAZ9JlU2w9ZmUzZGE0OGEtYTk3Yy00NWEzLWJjYTktMmQzOTY4YzY4ZGYz&hl=en.
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      1. USGreg Sansom
    3. CO@Andrew possibly you just have a typo in your binding - I assume the correct binding path might be ServerJob.FileSize instead of SeverJob.FileSize.
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      1. USSergii Volchkov
 

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