"Value cannot be null. Parameter name: id" problem with Bubble series

04-10-2009 2:58 PM |

Hi I have a problem with the bubble chart, using the sliverlight toolkit in a wpf app. I get the following error "Value cannot be null. Parameter name: id" when selecting a bubble.

I attach the source code, any ideas? Thanks

<Window x:Class="WpfApplication2.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:charting="clr-namespace:System.Windows.Controls.DataVisualization.Charting;assembly=System.Windows.Controls.DataVisualization.Toolkit"
xmlns:chartingprimitives="clr-namespace:System.Windows.Controls.DataVisualization.Charting.Primitives;assembly=System.Windows.Controls.DataVisualization.Toolkit"
		Title="Window1" 
		Height="600" 
		Width="600">
	<DockPanel>
		<Button Content="Update"
				DockPanel.Dock="Right"
				Margin="5 25 5 25"
				Name="button"
				Click="button_Click" />
		<TextBlock Name="Risk"
				   DockPanel.Dock="Bottom"
				   Text="{Binding RiskLabelValue}" />
		<charting:Chart Opacity="1"
						BorderBrush="#FFFBF5F5">
			<charting:BubbleSeries IndependentValueBinding="{Binding Risk}"
				IsSelectionEnabled="True"
				DependentValueBinding="{Binding Expected2M}"
				SizeValueBinding="{Binding BubbleSize}"
				Name="bubbles"
				SelectionChanged="bubbles_SelectionChanged"
				SnapsToDevicePixels="True" 
				SelectedItem="0">
				<charting:BubbleSeries.DataPointStyle>
					<Style TargetType="Control">
						<Setter Property="Opacity"
						Value="0.8" />
						<Setter Property="Background"
						Value="Blue" />
					</Style>
				</charting:BubbleSeries.DataPointStyle>
			</charting:BubbleSeries>
		</charting:Chart>
	</DockPanel>
</Window>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApplication2
{
	/// <summary>
	/// Interaction logic for Window1.xaml
	/// </summary>
	public partial class Window1 : Window
	{
		Random ran = new Random();


		public decimal RiskLabelValue
		{
			get { return (decimal)GetValue(RiskLabelValueProperty); }
			set { SetValue(RiskLabelValueProperty, value); }
		}

		// Using a DependencyProperty as the backing store for RiskLabelValue.  This enables animation, styling, binding, etc...
		public static readonly DependencyProperty RiskLabelValueProperty =
			DependencyProperty.Register("RiskLabelValue", 

typeof(decimal), 

typeof(Window1), 

new UIPropertyMetadata((decimal)0));



		public Window1()
		{
			InitializeComponent();
			SetData();			
		}

		private void button_Click(object sender, System.Windows.RoutedEventArgs e)
		{
			SetData();
		}

		private void SetData()
		{
			List items = new List();

			for (int i = 0; i < 10; i++)
			{
				items.Add(new DataItem { BubbleSize = 

(ran.Next(1, 10) * 0.01), 

Risk = ran.Next(-5, 5), 

Expected2M = ran.Next(-30, 30) });
			}

			bubbles.ItemsSource = items;
		}

		private void bubbles_SelectionChanged(object sender, SelectionChangedEventArgs e)
		{
			if (e.AddedItems.Count > 0)
			{

			}
		}
	}



	public class DataItem
	{

		public decimal Risk
		{
			get;
			set;
		}

		public decimal Expected2M
		{
			get;
			set;
		}

		public double BubbleSize
		{
			get;
			set;
		}

	}
}

Re: "Value cannot be null. Parameter name: id" problem with Bubble series

04-13-2009 4:59 PM |

FYI, while the above should work fine, it's not implementing true RoutedEvent behavior. There'll probably be a more thorough fix sometime in the near future. When there is, I'll post about it on my blog.

Re: "Value cannot be null. Parameter name: id" problem with Bubble series

04-14-2009 5:45 AM |

Thanks David, that worked.