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ObservableCollection Dataseries vanishes after 200 datapoints

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scorp
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scorp asked on 08 Apr 2011, 10:19 PM
I have a chart with an observablecollections with a custom class with 4-5 fields. Couple of fields map to the XValue and YValue and the others are to identify the datapoint. In the BuildCustomItemStyle method I use the dataseries to get all fields bound to the datapoint via
(dataSeries[(item as BaseChartItem).CurrentIndex].DataItem
However if I exceed 200 datapoints on the chart the information doesn't exist anymore and I am unable to access the fields. Also I tried to bind one of my fields to LegendLabel and extract it as well. Though this works for a limited number of datapoints on the chart and doesn't bind if the datapoints increase in number.

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Yavor
Telerik team
answered on 14 Apr 2011, 06:42 AM
Hi scorp,

One possible cause for this behavior may be the sampling. For more information on this feature, please refer to this article:

http://www.telerik.com/help/silverlight/radchart-features-sampling.html

You can set the SamplingThreshold to 0, to see if the data is available. If it is not, you can open a formal support ticket, and send us a small working project, for additional review and testing.

Kind regards,
Yavor
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