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Pie Chart Labels/Values

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Xavier Soares
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Xavier Soares asked on 15 Sep 2008, 03:41 PM

Hello,

Is it possible in pie chart show the slice name and correspondent value?

I only can show or one or other.

Thank you.
LM

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Dwight
Telerik team
answered on 16 Sep 2008, 06:26 AM
Hi Luis,

Thank you for contacting us. There are two solutions to the problem:
  1. Handle the ItemDataBound event and set the corresponding label's text to the one you want. Through the event arguments you can access the data item that is currently binding to the ChartItem.
  2. If your data source is DataTable, create a new expression column, which concatenates the label and the value. Then use this column as source for the pie chart's labels.
Should you need further assistance, do not hestitate to write us back.

Regards,
Evtim
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Xavier Soares
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answered on 16 Sep 2008, 09:43 AM
Hello,

The second option don't seems to help because I need to show the name and the corresponding percentage, not the value.

Can you give an hand with the first option?

By the way, the sample that is in the RadChart help is what I need (Mailbox Space in Rad Chart Basics).

Thank You.
LM
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Dwight
Telerik team
answered on 19 Sep 2008, 11:38 AM
Hello Luis,

This approach requires you to handle the ItemDataBound event. Here is a sample handler method:
void radChart1_ItemDataBound(object sender, ChartItemDataBoundEventArgs e) 
    DataRowView row = e.DataItem as DataRowView; 
    e.SeriesItem.Label.TextBlock.Text = string.Format("{0}, value = #%", row["Text"]); 
Note, that the current example assumes the data source is DataTable and the data item supplied is DataRowView. The #% in the string tells the chart that it should put percentage at that place in the string.

Regards,
Evtim
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Xavier Soares
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answered on 19 Sep 2008, 12:58 PM
Worked! Thank You.

LM
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Dwight
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Xavier Soares
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