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PO.NET graphics problem with GroupBoxes and NumericUpDowns
 

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  1. PO.NET graphics problem with GroupBoxes and NumericUpDowns
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    <p>We're having some kind of graphics problem which seem to be related to the .NET runtime. Once in a while, the borders of all GroupBoxes and the arrows of all NumericUpDowns in our application dissappears. It seems like they stop repainting for some reason, because the NumericUpDowns sometimes have graphics garbage where the arrows should be.</p> <p>We suspect that the error occurs after restarting the application several times. Once the problem is present, restarting the application doesn't help. But closing all .NET processes and restarting the application makes the problem disappear, this points toward a problem in the .NET runtime.</p> <p>Our application is a WinForms app developed using VS 2008 SP1 and targets .NET 3.5. It runs on Windows XP SP3 in classic mode (client company policy).</p> <p>I've searched for others having similar problems, but most hits involve custom paint events for GroupBoxes. Our controls are plain standard - no paint events are used at all.</p> <p>EDIT: How can I deliberately exhaust the desktop heap to reproduce the problem? I've been playing with Task Manager and GdiUsage while creating pens, brushes and fonts like crazy. Not calling dispose of course, but also storing them in a list to avoid garbage collection. Still, after creating 100 000 pens with random colors I just have a few objects according to the monitor tools.</p> <pre><code>List&lt;Pen&gt; pens = new List&lt;Pen&gt;(); Random rnd = new Random(); for(int i = 0; i &lt; 100000; i++) pens.Add(new Pen(Color.FromArgb(rnd.Next()))); </code></pre>
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    1. PO
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    1. USAnlo
    1. USAnlo
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    1. COAs soon as your list of pens goes out of scope, every pen can be garbage collected. Store the list in the class insted of a local variable.
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      1. PO.NET graphics problem with GroupBoxes and NumericUpDowns
      1. USDan Byström
    2. COMy example was a bit unclear, the list is actually stored in the class.
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      1. PO.NET graphics problem with GroupBoxes and NumericUpDowns
      1. USAnlo
 

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