custom binding

[Itamar]

Hi Telerik,

I have a problem with binding data to chart

my point inculcated date and int 

but my int can be null

i don't what to display the point but i what the chart to show the empty space  

 

code:

public class DataEntity : NSObject     

{         

        [Export("Date")]         

       public NSDate Date { get; set; }       

      [Export("Value")]     

    public int? Value { get; set; }       

     public SeriesNames SeriesName { get; set; }  

}

 

[Deyan]

Hello Itamar,

Can you please share some more information about the series type you are using?

Regards,
Deyan
Telerik by Progress

[Itamar]

 On the chart we build, the x axis is: TKChartNumericAxis and the y TKChartDateTimeAxis
And I am using the series TKChartLineSeries and TKChartAreaSeries
public class DataEntity : TKChartDataPoint // NSObject
    {
        public override NSObject DataYValue
        {
            [Export("dataYValue")]
            get
            {
                return new NSNumber(this.Value);
            }
        }

        public override NSObject DataXValue
        {
            [Export("dataXValue")]
            get
            {
                return Date;
            }
        }
        public NSDate Date { get; set; }
        public double Value { get; set; }
        public SeriesNames SeriesName { get; set; }
    }

I need to change the double value to double nullable 

[Deyan]

Hi,

Thanks for writing back.

Currently support for EMPTY (nil) values is not implemented. Here's a similar thread on our forums that suggest a way for working around this limitation:

http://www.telerik.com/forums/dealing-with-nil-value-in-series

Let us know should you have additional questions.

Regards,
Deyan
Telerik by Progress

[Itamar]

I look on the code sample that you send me
and be my understanding I need to create new series when every I have null point
I have a lot of null point in my charts and I don’t think It is a good solution
And also we working with databinding
But if it is the only solution then you can send me code example in  xamarin iOS
Regards Itamar

[Deyan]

Hi Itamar,

Thanks for writing back.

Here's a sample snippet which works good on my side:

public void ReloadChart()
        {
            chart.RemoveAllData ();

            Random r = new Random ();

            for (int i = 0; i < 1; i++) {

                List<TKChartDataPoint> list = new List<TKChartDataPoint> ();
                for (int j = 0; j < 80; j++) {
                    list.Add(new TKChartDataPoint(new NSNumber(j+1), j % 7 == 0 ? null : new NSNumber(r.Next()%100)));
                }
                chart.BeginUpdates();


                        List<TKChartDataPoint> newSource = new List<TKChartDataPoint>();
                        for (int k = 0; k < list.Count; k++)
                        {
                            TKChartDataPoint dp = list[k];
                            if (dp.DataYValue == null)
                            {
                                TKChartLineSeries newSeries = new TKChartLineSeries(newSource.ToArray());
                                chart.AddSeries(newSeries);
                                newSource = new List<TKChartDataPoint>();
                            }
                            else
                            {
                                newSource.Add(dp);
                            }

                            if (i == list.Count - 1 && newSource.Count > 0)
                            {
                                TKChartLineSeries lineSeries = new TKChartLineSeries();
                                chart.AddSeries(lineSeries);
                            }
                        }


                chart.EndUpdates();
            }

Regards,
Deyan
Telerik by Progress