ChartFX may throw NullReferenceException if the same item source is reused.

[djsun]

I am using 8.0.3712.22025.

Here is an example:The Person type has the Name and the Age notify properties.

public class Person : INotifyPropertyChanged

{

private int age;

private string name;public Person(string name, int age)

{

this.name = name;this.age = age;

}

public event PropertyChangedEventHandler PropertyChanged;public int Age

{

get

{

return this.age;

}

set

{

if (this.age != value)

{

this.age = value;this.OnPropertyChagned("Age");

}

}

}

public string Name

{

get

{

return this.name;

}

set

{

if (this.name != value)

{

this.name = value;this.OnPropertyChagned("Name");

}

}

}

protected virtual void OnPropertyChagned(string propName)

{

var h = this.PropertyChanged;if (h != null)

{

h(this, new PropertyChangedEventArgs(propName));

}

}

}

The Chart window has a simple chart, a load button to reload the data and a change button to modify the first Person's Age.

<

Window

x:Class="ChartFXWpfApplication1.ChartNotStopListenPropChange"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

Title="Window1"

Height="480"

Width="640"

xmlns:cfx="http://schemas.softwarefx.com/chartfx/wpf/80">

<Window.Resources>

</Window.Resources><Grid>

<cfx:Chart Name="chart1">

<cfx:Chart.AxesX>

<cfx:Axis>

<cfx:Axis.Title>

<cfx:Title Content="Name" />

</cfx:Axis.Title>

<cfx:Axis.Labels>

<cfx:AxisLabelAttributes BindingPath="Name" />

</cfx:Axis.Labels>

</cfx:Axis>

</cfx:Chart.AxesX>

<cfx:Chart.AxesY>

<cfx:Axis>

<cfx:Axis.Title>

<cfx:Title Content="Age" />

</cfx:Axis.Title>

</cfx:Axis>

</cfx:Chart.AxesY>

</cfx:Chart>

<StackPanel Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Bottom">

<Button x:Name="Reload" Content="Reload" Click="Reload_Click"/>

<Button x:Name="Change" Content="Change" Click="Change_Click"/>

</StackPanel></Grid>

</

Window>And the code behind:

public partial class ChartNotStopListenPropChange : Window

{

private Random r = new Random();

private List<Person> source = null;public ChartNotStopListenPropChange()

{

InitializeComponent();

this.source = new List<Person>(new[] { new Person("Foo", r.Next(1, 100)) });this.load();

}

private void AddSeries(IEnumerable<Person> source, Gallery gallery, int? index)

{

var series1 = new SeriesAttributes();

series1.ItemsSource = source;

series1.Gallery = gallery;

series1.Content = "Person";series1.BindingPath = "Age";

chart1.Series.Add(series1);

}

private void Change_Click(object sender, RoutedEventArgs e)

{

this.source[0].Age += 1;

}

private void Clear()

{

foreach (var s in chart1.Series)

{

s.ItemsSource = null;

}

chart1.Series.Clear();

chart1.ItemsSource = null;

}

private void load()

{

Clear();

AddSeries(this.source, Gallery.Bar, 1);

}

private void Reload_Click(object sender, RoutedEventArgs e)

{

this.load();

}

}

To repro:1. Start the application2. Click the Reload button3. Click the Change buttonAt step 3, NullReferenceException was unhandled.

[JuanC]

We have fixed this issue in build 3728

Regards,

JuanC