Last Updated: 07 May 2020 08:01 by ADMIN
Created on: 30 Apr 2020 16:11
Category: UI for Xamarin
Type: Bug Report
Chart Series not Detecting Property Changes

The chart's series are not detecting property changed notifications on items in the series.


  • This works as expected in UWP
  • The series also doesn't seem to detect any ItemsSource property changes either.


If you have a data model where the properties are using INotifyPropertyChanged, for example from your NotifyPropertyChangedBase

public class Item : NotifyPropertyChangedBase
    private DateTime date;
    private int value;

    public DateTime Date
        get => date;
        set => UpdateValue(ref date, value);

    public int Value
        get => value;
        set => UpdateValue(ref this.value, value);

Here's a view model to use, invoke the command to observe the problem

public class MainViewModel : NotifyPropertyChangedBase
    public MainViewModel()
        var rand = new Random();

        DataPoints = new ObservableCollection<Item>(Enumerable.Range(1,5).Select(i=>new Item
            Date = DateTime.Today.AddDays(-i),
            Value = rand.Next(1,10)

        ChangeDataCommand = new Command(() =>
            foreach (var dataPoint in DataPoints)
                dataPoint.Value = rand.Next(1, 20);

    private ObservableCollection<Item> dataPoints;
    public ObservableCollection<Item> DataPoints
        get => dataPoints;
        set => UpdateValue(ref dataPoints, value);

    public Command ChangeDataCommand { get; set; }

        <RowDefinition Height="Auto"/>

    <telerikChart:RadCartesianChart x:Name="Chart">
            <telerikChart:DateTimeContinuousAxis LabelFormat="MM-dd"
                                                 LabelFitMode="Rotate" />
            <telerikChart:NumericalAxis Minimum="0" Maximum="10"/>
            <telerikChart:LineSeries ValueBinding="Value"
                                           ItemsSource="{Binding DataPoints}" />

    <Button Text="Change Data"
            Command="{Binding ChangeDataCommand}"

1 comment
Posted on: 07 May 2020 08:01

Hi Dayanand,

Thank you for reporting this issue in Chart control. I've updated the status of the item to "Unplanned" as I confirm it's an valid issue on our side and we'll have it in mind. 

Please follow the feedback item to get notified on status changes.

I am sorry for any inconvenience caused.

Progress Telerik

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