Multiple items custom labels binding

[shivinder]

So i have points Data that have two members YValue and Axis Label.
i have multiple series. for each series i set the mapping as such

seriesmapping.SeriesDefinition = GetSeriesType(series.SeriesType);// right now all are line charts
            seriesmapping.CollectionIndex =index;
    ItemMapping itemMapping = new ItemMapping();
            itemMapping.DataPointMember = DataPointMember.YValue;
            itemMapping.FieldName = "YValue";
            return itemMapping;
    seriesmapping.ItemMappings.Add(ItemMapping);

Now for the labels i am taking the following approach. i tried keeping this binding for only the first series. then bind to every series
//ItemMapping itemMapping = new ItemMapping();
                //itemMapping.DataPointMember = DataPointMember.Label;// i tried both this and X category
                //itemMapping.FieldName = "AxisLabel";
                //seriesmapping.ItemMappings.Add(itemMapping);

with one series the labels work (i have other issues but they are mentioned in my last question). but adding multiple series and trying to bind the labels it does not work . what am i doing wrong.

Also. i dont want display certain points. these points i have as NAN. but you guys graph that and makes my graph look awful. is there anyway i can not display NAN.

[Missing User]

Hello shivinder,

When creating the chart data mappings in the code behind you need to create each SeriesMapping and its ItemMappings and add the mapping to the RadChart.SeriesMappings. You can try the following approach:

for (int i = 0; i < testData.Count; i++)
{
    SeriesMapping seriesmapping = new SeriesMapping();
    seriesmapping.SeriesDefinition = new LineSeriesDefinition();
    seriesmapping.CollectionIndex = i;

    ItemMapping itemMapping = new ItemMapping();
    itemMapping.DataPointMember = DataPointMember.YValue;
    itemMapping.FieldName = "YValue";
    seriesmapping.ItemMappings.Add(itemMapping);

    ItemMapping itemMapping2 = new ItemMapping();
    itemMapping2.DataPointMember = DataPointMember.Label;
    itemMapping2.FieldName = "AxisLabel";
    seriesmapping.ItemMappings.Add(itemMapping2);

    chart.SeriesMappings.Add(seriesmapping);
}

More information about Data Binding to Nested Collections can be found here.

If you have empty values that you want to hide you can use empty/null values functionality that will be introduced with the upcoming Q1 2011 version of the Chart control. In your case when you have NaN values, you can convert them to null. More information about this feature can be found in this blog post.

I hope this helps.

Regards,
Polina
the Telerik team