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TargetInvocationException occurred while binding to Dictionary

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Johannes
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Johannes asked on 08 Nov 2013, 02:10 PM

Hi Telerik,

When I create a PieChart and set the Itemssource-Property to a Dictionary<string,decimal> a TargetInvocationException occurred.

My XAML:

<telerik:RadPieChart>
                        <telerik:RadPieChart.Series>
 
                            <telerik:PieSeries ShowLabels="True" ItemsSource="{Binding PieValues}"  >
                                <telerik:PieSeries.ValueBinding>
                                    <telerik:PropertyNameDataPointBinding PropertyName="Value" />
                                </telerik:PieSeries.ValueBinding>
                                <telerik:PieSeries.LabelDefinitions>
                                    <telerik:ChartSeriesLabelDefinition Margin="-10">
                                        <telerik:ChartSeriesLabelDefinition.Binding>
                                            <telerik:PropertyNameDataPointBinding PropertyName="Key" />
                                        </telerik:ChartSeriesLabelDefinition.Binding>
                                    </telerik:ChartSeriesLabelDefinition>
                                </telerik:PieSeries.LabelDefinitions>
                            
                            <telerik:PieSeries.AngleRange>
                                <telerik:AngleRange StartAngle="270" SweepAngle="360" />
                            </telerik:PieSeries.AngleRange>
                        </telerik:PieSeries>
                        </telerik:RadPieChart.Series>
                    </telerik:RadPieChart>

The PieValue ist a

Dictionary<string, decimal>


The Error Occurred on "OnPropertyChanged(() => PieValues);"


Dear Johannes

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Peshito
Telerik team
answered on 13 Nov 2013, 01:05 PM
Hello,

Thank you for the attached code snippets, I was able to create a new project and reproduce the issue at hand.

You are using a Dictionary as ItemsSource. However, the Dictionary is IEnumerable<KeyValuePair>. The KeyValuePair is not a class, but a struct, and it is a limitation of the chart that properties of struct objects cannot be evaluated. What you can do, is using another collection type instead.

Regards,
Peshito
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Johannes
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Peshito
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