at MS.Internal.XcpImports.MethodEx(IntPtr ptr, String name, CValue[] cvData)
at MS.Internal.XcpImports.MethodEx(DependencyObject obj, String name)
at System.Windows.UIElement.UpdateLayout()
at Telerik.Windows.Controls.PopupWrapper.AdjustPopupLocation()
at Telerik.Windows.Controls.RadComboBox.AdjustPopupLocation()
at Telerik.Windows.Controls.RadComboBox.UpdateItemsVisibility(Boolean showAll, List`1 matchIndices)
at Telerik.Windows.Controls.RadComboBox.DropDownPopupOpened(Object sender, EventArgs e)
at MS.Internal.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args)
at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, String eventName)}
Its going to be a bit difficult to replicate this, so I'm hoping that based on the stack trace, I can get a hint as to what might be going on.
We have a series of combo boxes on a form. Selecting a value in 1 will filter the contents of another (or multiple).
Within one combo, if we select a value via drop down and click (combo closes), then try to to select another value, this exception occurs. This exception only occurs under the following scenario:
The combo box itemssource has changed between selections, and the combo box doesn't lose focus.
We are using the 8/21 internal build.
Consider it like this:
Food Categories - Changing a category, filters food choices.
Food Choices
Selecting a Food, changes the selected Food Category which in turns further filters Food. If you try to drop down the Food combo box a second time after its itemsource has been updated, this error occurs.
4 Answers, 1 is accepted
We fixed very similar problem that occurs when you change the ItemsSource of RadComboBox in the property setter of a property that is bound to SelectedItem (or SelectedValue, or SelectedIndex). The fix will be published today, please check if the exception is thrown with the new version. If the problem persists, I would need a simple application that resembles your scenario, even if the problem is hardly reproducible.
Regards,
Valeri Hristov
the Telerik team
Rank 1
I downloaded the January 14th release, and its still a problem. However, I'm having a hard time replicating it outside our solution to post here.
Is there any other way to debug this problem?
In summary, we have a data form that has combo boxes replaced during the AutoGenerate method, the combo box is bound to a property on the view model and looks something like this:
this.SetItemsSourceBinding(comboBox, e.PropertyName, e.PropertyType, lookupAttribute, propertyInfo);
e.Field.Content = comboBox;
e.Field.Content.SetBinding(
RadComboBox.IsEnabledProperty, new Binding("IsEnabled") { Source = e.Field });
private void SetItemsSourceBinding(FrameworkElement element, string propertyName, Type propertyType, LookupFieldAttribute lookupFieldAttribute, PropertyInfo propertyInfo)
{
itemsSourceBinding =
new Binding(string.Format("FilterManager.{0}.Items", fmPropertyInfo.Name))
{
Source =
this.EntityViewModel,
Mode =
BindingMode.OneWay
};
// set the itemssource binding
element.SetBinding(
ItemsControl.ItemsSourceProperty, itemsSourceBinding);
// set the display member path to the lookup item's description.
((
ItemsControl)element).DisplayMemberPath = "Description";
// set the selected item binding to a converter that knows how to convert between the property's value
// and a lookup item.
element.SetBinding(
Selector.SelectedItemProperty,
new Binding(propertyName)
{
Mode =
BindingMode.TwoWay,
Converter =
new LookupBoundItemsControlToLookupItemConverter(),
ConverterParameter = element
});
Rank 1
<Setter Property="ItemsPanel">
<Setter.Value>
<ItemsPanelTemplate>
<VirtualizingStackPanel />
</ItemsPanelTemplate>
</Setter.Value>
</Setter>
We will greatly appreciate a sample project of yours. It will definitely help us in further pinpointing and resolving the problem. Can you attach the sample project to this thread?
George
the Telerik team