Databinding Unique Values on x-axis

[Michael]

Hi,

I am databinding multiple series to my chart.  Each series is money spent per month per person.

So, say I have three people a, b, and c.  I am trying to plot their spending over aperiod of 6 months (all the same months Jan 2008 through June 2008).

My data is coming back via an ObjectDataSource with these fields:

Person | Amount | Month

The key portion of my code looks like this:
       

       //add a series for each person
        for (int i = 0; i <= (selectedPersons.Count - 1); i++)
        {
            ChartSeries chartSeries = new ChartSeries();
            chartSeries.Name = selectedPersonNames[i].ToString();
            chartSeries.Type = ChartSeriesType.Line;
            chartSeries.DataYColumn = "$";
            usageChart.Series.Add(chartSeries);
        }


        //set the x axis labels, adjust any appearance, and bind the data
        usageChart.DataSource = personExpenses;
        usageChart.PlotArea.XAxis.DataLabelsColumn = "Month";
        usageChart.DataBind();

The problem I am running into is that the x-axis is adding a total of 18 months (6 for each of the three people).  The x-axis looks like this:

Jan Feb Mar Apr May Jun Jul Jan Feb Mar Apr May Jun Jul Jan Feb Mar Apr May Jun Jul

I want 6 months and three series -- How can I get the x-axis to display only unique values?

Thanks,

Mike

[Ves]

Hi Michael,

You can take advantage of the DataGroupColumn property of RadChart. You can find more details here.

Here is a simple example of databinding RadChart in this manner:

protected void Page_Load(object sender, EventArgs e)
    {

        List<MyObject> myList = new List<MyObject>();

        myList.Add(new MyObject { Amount = 3, Person = "Person1", Month = "Jan" });
        myList.Add(new MyObject { Amount = 6, Person = "Person2", Month = "Jan" });
        myList.Add(new MyObject { Amount = 7, Person = "Person3", Month = "Jan" });
        myList.Add(new MyObject { Amount = 4, Person = "Person1", Month = "Feb" });
        myList.Add(new MyObject { Amount = 5, Person = "Person2", Month = "Feb" });
        myList.Add(new MyObject { Amount = 9, Person = "Person3", Month = "Feb" });

        RadChart1.DataSource = myList;
        RadChart1.DataGroupColumn = "Person";
        RadChart1.PlotArea.XAxis.DataLabelsColumn = "Month";
        RadChart1.DataBind();
    }

    public class MyObject
    {
        public double Amount { get; set; }
        public string Person { get; set; }
        public string Month { get; set; }
    }

The chart configuration would remain the same when used with ObjectDatasource. Hope this helps.

All the best,
Ves
the Telerik team

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