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POSilverlight Application Error 0x17F8 on ComboBox_DropDownOpened
 

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  1. POSilverlight Application Error 0x17F8 on ComboBox_DropDownOpened
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    <p>I have several similar comboboxes with custom templates that display one custom control on the dropdown. Suddenly one of those controls have broken and they give me the following error when I open the combobox.</p> <pre><code>Message: Unhandled Error in Silverlight 2 Application Error 0x17F8. Debugging resource strings are unavailable. See http://go.microsoft.com/fwlink/?linkid=106663&amp;Version=4.0.50401.0&amp;File=mscorrc.dll&amp;Key=0x17F8 at &lt;INSERT_NAMESPACE&gt;.ComboBox_DropDownOpened(Object sender, EventArgs e) at System.Windows.Controls.ComboBox.OnDropDownOpened(EventArgs e) at System.Windows.Controls.ComboBox.OnIsDropDownOpenChanged(Boolean isDropDownOpen) at System.Windows.Controls.ComboBox.OnIsDropDownOpenChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) at System.Windows.DependencyObject.RaisePropertyChangeNotifications(DependencyProperty dp, Object oldValue, Object newValue) at System.Windows.DependencyObject.UpdateEffectiveValue(DependencyProperty property, EffectiveValueEntry oldEntry, EffectiveValueEntry&amp; newEntry, ValueOperation operation) at System.Windows.DependencyObject.SetValueInternal(DependencyProperty dp, Object value, Boolean allowReadOnlySet) at System.Windows.DependencyObject.SetValue(DependencyProperty property, Boolean b) at System.Windows.Controls.ComboBox.ElementDropDownToggle_Click(Object sender, RoutedEventArgs e) at System.Windows.Controls.Primitives.ButtonBase.OnClick() at System.Windows.Controls.Primitives.ToggleButton.OnClick() at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e) at System.Windows.Controls.Control.OnMouseLeftButtonUp(Control ctrl, EventArgs e) at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, String eventName) Line: 1 Char: 1 Code: 0 </code></pre> <p>As you can see this only happens in deployed release versions and on the machines with no development environments. The same release version (and debug version) is working on my development machine.</p> <p>I wrapped everything on the DropDownOpened event handler inside a try-catch-block to get more information but the catch doesn't fire at all. </p> <p>I tried to Google the error but so far haven't found anything that would be helpful. Any advice how to start solving this? Could this be related to Silverlight runtime version or something that should be installed on the release machines as well?</p>
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    1. USAntti Simonen
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    1. COAre you actually using Silverlight 2? e.g. "Unhandled Error in Silverlight 2 Application"
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      1. USGone Coding
    2. CONo, it's Silverlight 4. The exception is just like that :)
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      1. USAntti Simonen
 

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