Help with ScatterLine chart | Infragistics Forums

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Help with ScatterLine chart

Dmitriy posted over 14 years ago

I am trying to create a very simple ScatterLine chart, but just can't seem to get it to work. Since I've just started learning wpf yesterday, I feel as if I am missing some important piece here.

It breaks on start with error message "The scatter chart needs ValueX and ValueY. The values have to be set for every data point using ChartParameters collection." I've defined a DataMapping (DataMapping="ValueX=X; ValueY=Y"), so in theory I should not be getting this message.

XAML:

CodeBehind:

namespace DeltaOne.HFClient
{
    public partial class HFClient : Window
    {
        protected ObservableCollection<HFPoint> dataSeries = new ObservableCollection<HFPoint>();

        public HFClient()
        {
            InitializeComponent();
        }

        private void btnAdd_Click(object sender, RoutedEventArgs e)
        {
            double x = Double.Parse(textBox1.Text);
            double y = Double.Parse(textBox2.Text);

            addDataPoint(x, y);
        }

        private void addDataPoint(double x, double y)
        {
            HFPoint p = new HFPoint();
            p.PropertyX = x;
            p.PropertyY = y;
            dataSeries.Add(p);
        }

    }

    public class HFPoint
    {
        public Double PropertyX { get; set; }
        public Double PropertyY { get; set; }
    }

}

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Offline Graham Murray posted over 14 years ago

maybe its just a typo in your post, but

DataContext="Binding Source={StaticResource dataSeries}"

should read:

DataContext="{Binding Source={StaticResource dataSeries}}"

Binding is a markup extension

Let me know if this helps you out!

-Graham
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Offline Graham Murray posted over 14 years ago in reply to Graham Murray

MSDN info on WPF/Silverlight resources system: http://msdn.microsoft.com/en-us/library/ms750613.aspx
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Offline Graham Murray posted over 14 years ago in reply to Graham Murray

Also, the StaticResource markup extension is for referencing items by key that are in the accessible resources at that level. I don't see in your Xaml or your code behind any inclusion of your data into the resources.

One thing you can do is set the data context of the window in its constructor

this.DataContext = dataSeries;

And then remove the Source={StaticResource dataSeries} from the binding above, which should be setting the binding for the DataSource property, by the way, as I'm not sure if this version of the chart will fall back on using the data context if no DataSource is provided:

DataSource="{Binding}"

If you want to use a static resource as a source rather than setting the DataContext of the window, you should define a collection in the resources for the window. Something like this:

<Window.Resources>

<MyCollection x:Key="dataSeries" />

</Window.Resources>

-Graham
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