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Change LegendLabel in Code behine

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Abdulhameed asked on 10 Apr 2012, 06:29 AM

I have a chart with three Series Mapping two lines, and one area chart, for the legend I am using auto generated items and setting the label on the series mapping. see the code below

<telerik:RadChart HorizontalAlignment="Left" telerik:StyleManager.Theme="Metro"

Name="SeisLineChart" VerticalAlignment="Top"

ItemsSource="{Binding}" Height="500" Width="700" Margin="0">

<telerik:RadChart.DefaultView>

<telerik:ChartDefaultView ChartLegendPosition="Bottom">

<!--<telerik:ChartDefaultView.ChartTitle>

<telerik:ChartTitle FontSize="13" Padding="2" />

</telerik:ChartDefaultView.ChartTitle>-->

<telerik:ChartDefaultView.ChartLegend>

<telerik:ChartLegend x:Name="DailyProductionRefLegend" Header="" UseAutoGeneratedItems="True" Padding="2,2,5,1" HorizontalAlignment="Center" HorizontalContentAlignment="Center"/>

</telerik:ChartDefaultView.ChartLegend>

<telerik:ChartDefaultView.ChartArea>

<telerik:ChartArea Grid.Row="1" Grid.RowSpan="2" x:Name="chartArea" LegendName="DailyProductionRefLegend" >

<telerik:ChartArea.AxisY>

<telerik:AxisY x:Name="yAxis" Title="Unit" AutoRange="True" DefaultLabelFormat="#VAL{###,###}"/>

</telerik:ChartArea.AxisY>

<telerik:ChartArea.AxisX>

<telerik:AxisX x:Name="xAxis" Title="Weeks" AutoRange="True" LabelStep="4" IsDateTime="False"/>

</telerik:ChartArea.AxisX>

</telerik:ChartArea>

</telerik:ChartDefaultView.ChartArea>

</telerik:ChartDefaultView>

</telerik:RadChart.DefaultView>

<telerik:RadChart.SeriesMappings>

<telerik:SeriesMapping x:Name="FiveYearsRangeMapping" LegendLabel="5 Year Ranges">

<telerik:SeriesMapping.SeriesDefinition>

<telerik:RangeSeriesDefinition SeriesName="FiveYearsRange" ShowItemLabels="False"

ShowItemToolTips="True"

ShowPointMarks="False"

EmptyPointBehavior="Zero"/>

</telerik:SeriesMapping.SeriesDefinition>

<telerik:SeriesMapping.ItemMappings>

<telerik:ItemMapping DataPointMember="XCategory" FieldName="Week" />

<telerik:ItemMapping DataPointMember="High" FieldName="HighValue" />

<telerik:ItemMapping DataPointMember="Low" FieldName="LowValue" />

</telerik:SeriesMapping.ItemMappings>

</telerik:SeriesMapping>

<telerik:SeriesMapping x:Name="LastYearMapping" LegendLabel="Last Year">

<telerik:SeriesMapping.SeriesDefinition>

<!--<telerik:SplineSeriesDefinition ShowItemLabels="False"  ShowItemToolTips="True" ItemToolTipFormat="#DATAITEM.Quantity{###,###,##0} #DATAITEM.UnitCode"/>-->

<telerik:LineSeriesDefinition SeriesName="LastYear" ShowItemLabels="False"

ShowItemToolTips="True"

ShowPointMarks="False"

EmptyPointBehavior="Gap"

/>

</telerik:SeriesMapping.SeriesDefinition>

<!--<telerik:SeriesMapping.GroupingSettings>

<telerik:GroupingSettings ShouldCreateSeriesForLastGroup="True">

<telerik:GroupingSettings.GroupDescriptors>

<telerik:ChartGroupDescriptor Member="Product"/>

</telerik:GroupingSettings.GroupDescriptors>

</telerik:GroupingSettings>

</telerik:SeriesMapping.GroupingSettings>-->

<telerik:SeriesMapping.ItemMappings>

<telerik:ItemMapping DataPointMember="XCategory" FieldName="Week" />

<telerik:ItemMapping DataPointMember="YValue" FieldName="LastYearQ" />

</telerik:SeriesMapping.ItemMappings>

</telerik:SeriesMapping>

<telerik:SeriesMapping x:Name="CurrentYearMapping" LegendLabel="Current Year">

<telerik:SeriesMapping.SeriesDefinition>

<telerik:LineSeriesDefinition SeriesName="CurrentYear" ShowItemLabels="False"

ShowItemToolTips="True"

ShowPointMarks="False"

EmptyPointBehavior="Gap"/>

</telerik:SeriesMapping.SeriesDefinition>

<telerik:SeriesMapping.ItemMappings>

<telerik:ItemMapping DataPointMember="XCategory" FieldName="Week" />

<telerik:ItemMapping DataPointMember="YValue" FieldName="CurrentYeatQ" />

</telerik:SeriesMapping.ItemMappings>

</telerik:SeriesMapping>

</telerik:RadChart.SeriesMappings>

</telerik:RadChart>

However when I tired to change the legend label from code behind it didn't work

SeisLineChart.SeriesMappings[0].LegendLabel = "New Legend label";

What is the best way yo change the legend label from code behind?

2 Answers, 1 is accepted

answered on 12 Apr 2012, 11:04 AM

BarChartLegend.zip

Hello Abdulhameed,

The way you are setting the LegendLabel in code behind is the correct one, however I was not able to reproduce the issue you have described. Please, find attached a sample project with a scenario similar to yours. If it does not help you solve your issue, could you send us a small runnable project isolating the problem, so we could provide you with an appropriate solution.

Regards,
Peshito
the Telerik team

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