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20
Failed to compare two elements in the array on second round of databinding
posted

Hi,

 

I have a simple page with two AJAX UpdatePanels. In the top panel I have a ThinkGeo Map and in the bottom panel I have an UltrWebGrid.

Selecting some features on the map populates a DataTable which is used as the Datasource for the Grid.

I group the Grid by the type of feature using:

 

 

 

protected void SelectionDetailsGrid_DataBound(object sender, EventArgs ){

 

 

Infragistics.WebUI.UltraWebGrid.UltraWebGrid gv = sender as Infragistics.WebUI.UltraWebGrid.UltraWebGrid;

 

 

if (col.Header.Caption.ToUpper() == "TERRITORY"){

 

 

col.IsGroupByColumn = true;}

 

 

 

 

gv.PerformGroupRows();

 

 

 

gv.ExpandAll(true);

}

All of this works fine on the first selection and the grid behaves as expected. However, on subsequent selections, the exception below is thrown. Just to be sure, I did apply the following code (based on suggestions of an earlier post) before rebinding my grid to the DataTable on subsequent selection.

gv.ResetBands()

gv.ResetRows()

gv.ResetColumns().

This made no difference and I still get this error.

System.InvalidOperationException was unhandled by user code
  Message="Failed to compare two elements in the array."
  Source="mscorlib"
  StackTrace:
       at eMap.MainApp.Map1_TrackShapeFinished1(Object sender, EventArgs e) in C:\DEV\T5\T5.eMap\Trunk\eMap\MainApp.aspx.cs:line 211
       at ThinkGeo.MapSuite.WebEdition.Map.OnTrackShapeFinished()
       at ThinkGeo.MapSuite.WebEdition.Map.x3296715cc7992de2(String x055cc4f8164153bb)
       at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
       at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
       at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
  InnerException: System.NullReferenceException
       Message="Object reference not set to an instance of an object."
       Source="Infragistics35.WebUI.UltraWebGrid.v8.3"
       StackTrace:
            at Infragistics.WebUI.UltraWebGrid.UltraGridLayout.GroupByColumnComparer.Compare(Object x, Object y)
            at System.Array.BinarySearch(Array array, Int32 index, Int32 length, Object value, IComparer comparer)
       InnerException:

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