Unwanted Doubling From AggregateFunctions

[Arne]

Hello,

for our program we use the MVVM-Pattern, so we have some "bindable propertiers". Such like the GroupDescriptorCollection (named DefaultGroupDesciptors) for the GridViews in our forms.

protected override void InitGroups()

{

   DefaultGroupDescriptors = new GroupDescriptorCollection();

 

   GroupDescriptor Descriptor_STKNR = new GroupDescriptor();

   Descriptor_STKNR.Member = "Field1";


   CountFunction cound = new CountFunction();

   Descriptor_STKNR.AggregateFunctions.Add(cound);

   DefaultGroupDescriptors.Add(Descriptor_STKNR);

 

   GroupDescriptor Descriptor_MEAUF = new GroupDescriptor();

   Descriptor_MEAUF.Member ="Field2";

   SumFunction sum = new SumFunction();

   Descriptor_MEAUF.AggregateFunctions.Add(sum);
   DefaultGroupDescriptors.Add(Descriptor_MEAUF);

}


// execut at the binding:
foreach (GroupDescriptor Elem in DefaultGroupDescriptors)
{  
     Grid.GroupDescriptors.Add(Elem);
    AddAggregateFunctions(Grid, Elem); 
}

 

private static void AddAggregateFunctions(RadGridView Grid, GroupDescriptor Elem)
{
   if (Elem.AggregateFunctions != null)
   {
      foreach (AggregateFunction Function in Elem.AggregateFunctions)
      {
         Grid.Columns[Elem.Member].AggregateFunctions.Add(Function);
      }
   }
}

The important part:
    Grid.GroupDescriptors.Add(Elem);
    AddAggregateFunctions(Grid, Elem);

This part doubles the AggregateFunctions from the first element:
(
         ...

   CountFunction cound = new CountFunction();

   Descriptor_STKNR.AggregateFunctions.Add(cound);

   DefaultGroupDescriptors.Add(Descriptor_STKNR);
    ...

)

to the seond element
(
    ...

 DefaultGroupDescriptors.Add(Descriptor_MEAUF);

    ...
).

I think a picture is helpful:



If I rotate the "important part", it works...

foreach (GroupDescriptor Elem in newValue)
{
   AddAggregateFunctions(ActGrid, Elem);
   ActGrid.GroupDescriptors.Add(Elem);
}

I hope you can explain me what happens here...

Regards
Arne Z.

[Maya]

Hello Arne,

We will need some more time to investigate the issue. In the mean time may you clarify what is the exact scenario that you want to accomplish ? Does changing the order of the two lines ruin the logic of you application ?
 

Regards,
Maya
the Telerik team

[Arne]

Hello Maya,

the problem is solved!
There was another binding that add the AggregateFunctions to the column.
Sometimes it's hard to keep track of these by using the MVVM-Pattern.

The AddAggregateFunctions added all AggregateFunctions to the spezified group-coloum. So it seems that the Functions are doubled.

Sorry for the unneeded work.


Reagrds,
Arne Z.