No method 'Average' on type 'System.Linq.Enumerable' is compatible with the supplied arguments.

[Luis Mejia]

Hi,

I'm testing out this library and I'm getting the following error:
No method 'Average' on type 'System.Linq.Enumerable' is compatible with the supplied arguments.

I'm doing a very simple test. Here is the relevant code:

public class Data
{
    public UInt32 XValue { get; set; }
    public double YValue { get; set; }
}

List<Data> m_Data; // This is initialized with data.

// Then, when setting up the chart...

SeriesMapping seriesMapping = new SeriesMapping();
LineSeriesDefinition lineDefinition = new LineSeriesDefinition();
lineDefinition.ShowItemLabels = false;
seriesMapping.SeriesDefinition = lineDefinition;
seriesMapping.ItemMappings.Add(new ItemMapping("XValue", DataPointMember.XValue));
seriesMapping.ItemMappings.Add(new ItemMapping("YValue", DataPointMember.YValue));
MyChart.SeriesMappings.Add(seriesMapping);

// Then I set my data
MyChart.ItemSource = m_Data;

When m_Data has more then 397 elements it throws that error. Before that number it looks pretty.

Any help will be greatly appreciated.
- Luis

[Ves]

Hello Luis Mejia,

Thank you for notifying us. It seems the issue is caused by the UInt32 type of the Data.XValue member. The issue is not observed when using int or long. If possible, please switch to int or long for the time being. I have notified our developers, so they will investigate the issue and provide a fix for the next version of the control.

Alternatively, you may disable the sampling in RadChart.

I have updated your Telerik points.

Best regards,
Ves
the Telerik team

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[Marcelo]

Hi,

I'm having the same issue but my XValues are of type datetime. To avoid this error I've tried changing the xvalues to string needed to revert back as the charts are way too slow to be updated (~ 600 points per series, 4 series per chart, 4 charts at the same time). Therefore I still don't have a solution for this issue.

Regards,

Marcelo

[Ves]

Hello Marcelo,

Please, find attached a small example.

Best regards,
Ves
the Telerik team