[Solved] Q2- SL3 - Error caused when using the group functionality

[PW]

I am using the latest release of Silverlight 3 (July 1, 2009) and am experiencing some strange behavior when trying to use the grouping in the gridview. Upon trying to group I sometimes (at least 50% of the time) will wind up with two groups for each item that was supposed to be grouped. For example, if I have a column in the grid like City there would be two groups formed for each city. When I try to expand one of the groups then I get the following error:

Microsoft JScript runtime error: Unhandled Error in Silverlight Application
Code: 4004    
Category: ManagedRuntimeError       
Message: System.ArgumentException: Duplicate key detected!
Parameter name: key
   at Telerik.Windows.Controls.GridView.GridView.Scrolling.RadKeyedCollection`2.AddKey(TKey key, Int32 index)
   at Telerik.Windows.Controls.GridView.GridView.Scrolling.RadKeyedCollection`2.InsertItem(Int32 index, TItem item)
   at Telerik.Windows.Controls.GridView.GridView.Scrolling.RadKeyedCollection`2.AddRange(RadKeyedCollection`2 collection)
   at Telerik.Windows.Controls.GridView.GridView.Scrolling.PhysicalHeightsCache.CreateChildHeightsCache(PhysicalHeightsCacheCollection result, Int32 indexInGroup, GroupRecord parentGroup, Int32 grIndex)
   at Telerik.Windows.Controls.GridView.GridView.Scrolling.PhysicalHeightsCache.CreateRecordsHeightsCache(IList`1 records, Int32 firstIndexInGroup, Boolean isCalledByParent)
   at Telerik.Windows.Controls.GridView.GridView.Scrolling.PhysicalHeightsCache.RefreshItemsPhysicalHeightsCache()
   at Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.OnRefreshScrollExtent()
   at Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.OnRefreshScrollExtent()
   at Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.UpdateRowHeight(IRowItem child)
   at Telerik.Windows.Controls.GridView.GroupVirtualizingPanel.UpdateRowHeight(IRowItem child)
   at Telerik.Windows.Controls.GridView.BaseVirtualizingPanel.MeasureOverride(Size availableSize)
   at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Single inWidth, Single inHeight, Single& outWidth, Single& outHeight)    

On the occasion that the groups are each only there once everything works as expected.

Any suggestions? I am binding to a very simple observable collection which is created at run time. In the silverlight 2 build of the same application the grouping works without any problems.

Thanks in advance for your help.

[PW]

As an add on to this item...if I turn off the DataLoadMode = "Asyncronous" the grouping works without error. When I turn the Asyncronous back on I get the same error.

Please Advise.

[Stefan Dobrev]

Hello Darcy,

Thanks for reporting this. We are already aware of this problem and we are preparing a fix for that will be available in the service pack release, targeted for first week of August.

Best wishes,
Stefan Dobrev
the Telerik team

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[FieldTRAKS]

can i get this fix by taking the binary from the nightly build??

[Hristo]

Hi Dave Branson,

The fix for this issue will be shipped with the Q2 SP1 which is expected next week.

Best wishes,
Hristo
the Telerik team

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[Martin Johnsson]

Hi

I am using version 2009.2.813.1020, and I am still experiencing the same problem

Regards
Martin

[Vlad]

Hi Martin,

Can you try our latest internal build instead?

All the best,
Vlad
the Telerik team

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[Martin Johnsson]

Hi

I am now using your latest build but the error remains

Regards
Martin

[Vlad]

Hello Martin,

Can you send us an example (via support ticket) where this error can be reproduced and debugged?

Sincerely yours,
Vlad
the Telerik team

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