Quick question about databinding to manual data series

[Marcus Lambert]

Hi,
I am binding a List to a bar chart and defining a Series Mapping.
The problem I am having is that if I change the List in my ViewModel the chart seem to think that the it now has another series.
That is a nice feature but I dont want it to happen, is there a way to clear the orginal ?
Below is how I am binding ...

Thanks

 <Telerik_Windows_Controls:RadChart UseDefaultLayout="False" ItemsSource="{Binding BIStatEmailUsers, Mode=OneWay}" Grid.Row="4" d:LayoutOverrides="Width" Height="300" >
   <Telerik_Windows_Controls:RadChart.DefaultSeriesDefinition>
    <Telerik_Windows_Controls_Charting:HorizontalStackedBarSeriesDefinition/>
   </Telerik_Windows_Controls:RadChart.DefaultSeriesDefinition>
   <Telerik_Windows_Controls:RadChart.SeriesMappings>
    <Telerik_Windows_Controls_Charting:SeriesMapping ChartAreaName="TopInternalUsers">
     <Telerik_Windows_Controls_Charting:SeriesMapping.ItemMappings>
      <Telerik_Windows_Controls_Charting:ItemMapping FieldName="total"/>
      <Telerik_Windows_Controls_Charting:ItemMapping DataPointMember="XCategory" FieldName="lastname"/>
     </Telerik_Windows_Controls_Charting:SeriesMapping.ItemMappings>
    </Telerik_Windows_Controls_Charting:SeriesMapping>
   </Telerik_Windows_Controls:RadChart.SeriesMappings>
<Telerik_Windows_Controls:RadChart/>

[Dwight]

Hi Marcus,

This is a known issue. It is already fixed. Expect the service pack in the first half of December.

Best,
Evtim
the Telerik team

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[Nathan]

Hello,

Any update on this issue? I just updated to 2009.3.1314 (trial) and I still get similar results.

I am setting my itemsource in code, but when I do something like this I get duplicate charts:

 

 

RadChart1.ItemsSource = Nothing

RadChart1.ItemsSource = oCol (observable collection I am binding to)

Any update would be appreciated!

Thanks,
Nathan

 

 

 

 

[Ves]

Hi Nathan,

I have attached a small example -- binding RadChart to observable collection. Can you please update it, so that the issue is reproduced?

Best regards,
Ves
the Telerik team

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[Nathan]

Hi Ves,

I did manage to recreate this issue, but at the same time found what I am doing wrong. When refreshing the chart, I not only have to clear the itemsource but also the seriesmappings since I am adding them dynamically in code - not in xaml.

So this replicates the duplication (commenting out the seriesmappings defined in xaml):

        private void LoadData()
        {
            RadChart1.ItemsSource = null;

            SeriesMapping sm1 = new SeriesMapping();
            sm1.CollectionIndex = 0;
            sm1.SeriesDefinition = new BarSeriesDefinition();
            sm1.LegendLabel = "My legend";

            ItemMapping yMap = new ItemMapping("MyProperty", DataPointMember.YValue);
            ItemMapping xMap = new ItemMapping("MyDescription", DataPointMember.XCategory);

            sm1.ItemMappings.Add(yMap);
            sm1.ItemMappings.Add(xMap);

            RadChart1.SeriesMappings.Add(sm1);

            ObservableCollection<ObservableCollection<MyObject>> bindData = new ObservableCollection<ObservableCollection<MyObject>>();

            data = new ObservableCollection<MyObject>()
            {
                new MyObject() {MyProperty=4, MyDescription="Number A"},
                new MyObject() {MyProperty=3, MyDescription="Number B"},
                new MyObject() {MyProperty=2,  MyDescription="Number C"},
                new MyObject() {MyProperty=4,  MyDescription="Number D"}
            };

            bindData.Add(data);

            RadChart1.ItemsSource = bindData;
        }

But if I do this when clearing out the old data it now works great!

 

            RadChart1.ItemsSource = null;
            RadChart1.SeriesMappings.Clear();

This all makes sense since I am adding series mappings directly to the chart I would also have to remove them (or skip adding them again) on a refresh. Since the user can change the chart type (say from vertical to horizontal bar) I simply remove all series mappings
and rebuild the entire chart.

Thanks for the help (and the great controls)!