I am using a RadCartesianChart with a ChartSeriesProvider to have multiple ScatterLineSeries plotted. I am controlling the X and Y min and max values displayed programmatically.

I am using a timer so I can change the X axis at some frequency I can set. I am testing it, but I intend to update the X min and max more than once a second so the chart shows a live previous 10 seconds. You can see points when they are created, then move through time until they go off the chart once it's more than 10 seconds old.

I am running into two problems.

I have 4 series. Each one is having points added about once a second. I run until I eventually get

'Collection was modified; enumeration operation may not execute.'

The call stack shows

   at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
   at System.Collections.Generic.List`1.Enumerator.MoveNextRare()
   at Telerik.Charting.DataPointCollection`1.<System.Collections.Generic.IEnumerable<Telerik.Charting.DataPoint>.GetEnumerator>d__5.MoveNext()
   at Telerik.Charting.NumericalAxisModel.PlotNormal(IEnumerable`1 series)
   at Telerik.Charting.NumericalAxisModel.PlotCore(AxisUpdateContext context)
   at Telerik.Charting.ChartAreaModelWithAxes.PlotAxisAndCombinedStrategy(AxisModel axis, AxisUpdateContext context)
   at Telerik.Charting.ChartAreaModelWithAxes.PlotAxesAndCombinedStrategies(SeriesByAxesTuple seriesByAxes)
   at Telerik.Charting.ChartAreaModelWithAxes.ArrangeOverride(RadRect rect)
   at Telerik.Charting.ChartNode.Arrange(RadRect rect, Boolean shouldRoundLayout)
   at Telerik.Charting.ChartAreaModel.Arrange()
   at Telerik.Windows.Controls.ChartView.RadChartBase.CallUpdateUI()
   at Telerik.Windows.Controls.ChartView.RadChartBase.OnInvalidated()

...

I think the chart is enumerating through the collection to see if it needs to update the axes every time a point is added. I am setting both axes myself as I have said so I'd think it wouldn't have to do that. If my assumption is correct, is there a way to turn this off? Otherwise should I look at locking the collection, or creating a buffer and adding chunks of data at a time? It does happen when there is just one series, and all 4 series.

Sorry to put two questions in here, but they may be related. I am wondering how much I am overloading the chart. Maybe it's not intended to have the axis updated super frequently so it's view/window moves through time.

The other problem relates to the band annotations I am using. They actually don't change, at least not when the chart is moving through time. I am setting vertical bands. The Y axis range only changes when values come in that are too high. But when that happens, the bands still stay the same. Both upper and lower bands' To and From don't change when the chart is moving through time.

''-1' is not a valid value for 'Width'.'

The chart bands shouldn't ever have -1 being set as their width. When this exception happens, none of my code is changing the bands. The properties the bands' To and From are bound to aren't changing. I haven't seen this happen when I just comment out the bands in xaml.

Hi,

  Does anyone has a sample of a Wind Rose done in WPF using the Polcar Chart ?

Thanks

C

1. I find GridViewCheckBoxColumn far too dull - the difference between checked and unchecked is not obvious enough when it's not active.  Is there an easy way to punch it up?
2. I'd like the functionality of GridViewSelectColumn, but from what I've been able to determine, it isn't really intended to be used with MVVM.  The documentation says explicitly that "GridViewSelectColumn does not bind to data".  Am I missing something?

Thanks!

Brad.

I'm using a DefaultVisualStyle Property to set the style in order to control the Fill color of ScatterPointSeries via the DataItem.PointColor property (as seen below)

This works fine, but when I try to use a ChartDataSourceStyle to reduce the number of datapoints using Index-based sampling, something breaks and I no longer see ANY points displayed in the graph, due to this binding failure:

** How can I redirect the DataPointSamplingInfo points to use the PointColor of its DataItems (they'll all have the same value) **

<Style x:Key="ScatterPointStyle" TargetType="Path" >
            <Setter Property="Fill" Value="{Binding RelativeSource={RelativeSource Mode=Self}, Path=Tag.DataItem.PointColor}"/>
</Style>

  <telerik:ChartSeriesProvider Source="{Binding ChartData}"  >
      <telerik:ChartSeriesProvider.SeriesDescriptors >

Hi 

I've been using the Microsoft WebView2 control lately and find it quite horrible to work with... 

I was wondering if you guys at Telerik would be able to make a wrapper for it that improve the functionality of the control ? 

Problems that i encountered : 

- Initialization is pretty messed up and require that you setup a Rube Goldberg machine to make it work.

- Overflow issues : the Webbrowser may overflow any / all other WPF controls unless you do a lot of scorcery ... 

- Having the WebView inside a scrollbar is pretty messed up with overflow issues all over.

Hi,

Is there a way to change the icon for the rad expander from the circle with a '<' or '>' to an icon and shape that I define?

Thanks

Tony

I'm sure this is trivial, but I've been unable to find the answer.  I have a RadGridView defined as follows:

<telerik:RadGridView
    ItemsSource="{Binding Products}"
    SelectedItem="{Binding SelectedProduct, Mode=TwoWay}">
    ...
</telerik:RadGridView>

However, when I change the "SelectedProduct" programmatically, the RadGridView doesn't show that highlighting.  What am I doing wrong?