Trouble binding properties of the XamChart

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Graeme posted over 16 years ago

Hi,

I'm not sure what I am doing wrong here. Could you please help me. I'm trying to bind various properties of an XamChart and it seems to ignore the returned result. Underneath is an example :

<igCA:Axis.Stripes>
<igCA:Stripe Unit="{Binding Path=SelectedValue, Converter={StaticResource CrossingConverter}, ElementName=AccountComboBox, Mode=Default}"/>
</igCA:Axis.Stripes>

[ValueConversion(typeof(object), typeof(Double))]
public class CrossingConverter : IValueConverter {
      public object Convert(object value, Type targetType, object parameter, CultureInfo culture) {
            if (value == null || ((Account)value).PortfolioAccounts == null)
                  return (Double)100;
            else
                  return (Double)Math.Round(((Account)value).PortfolioAccounts.InitialValue, 0);
      }

      public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) {
            return null;
      }
}

The value converter code is getting called and returning a value, however whenever I look at the value stored in the Unit it is always 0.

Thanks,

Graeme

PS. XamChart is looking like it will be a very good product.

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28496

Offline David Negley posted over 16 years ago

i tried this on my machine ... simplified in a few places... following is the complete solution.

<Window x:Class="WpfApplication2.Window1"

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

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

xmlns:igCA="clr-namespace:Infragistics.Windows.Chart;assembly=Infragistics3.Wpf.Chart.v7.2"

xmlns:local="clr-namespace:WpfApplication2"

Title="Window1" Height="300" Width="300">

<Window.Resources>

<local:CrossingConverter x:Key="CrossingConverter1" />

</Window.Resources>

<Canvas>

<ComboBox x:Name="AccountComboBox" Width="100" Height="25" />

<igCA:XamChart Width="250" Height="250" Canvas.Top="30">

<igCA:XamChart.Axes>

<igCA:Axis AxisType="PrimaryX">

<igCA:Axis.Stripes>

<igCA:Stripe Unit="{Binding Path=SelectedValue, Converter={StaticResource CrossingConverter1}, ElementName=AccountComboBox, Mode=Default}" />

</igCA:Axis.Stripes>

</igCA:Axis>

</igCA:XamChart.Axes>

</igCA:XamChart>
</Canvas>
</Window>

using System;

using System.Collections.Generic;

using System.Globalization;

using System.Windows.Data;

using System.Windows;
namespace WpfApplication2
{

/// <summary>

/// Interaction logic for Window1.xaml

/// </summary>

public partial class Window1 : Window

{
public Window1()
{

InitializeComponent();
this.AccountComboBox.ItemsSource = new List<Account>
{
new Account { Name = "John", Value = 1},
new Account { Name = "Paul", Value = 2},
new Account { Name = "George", Value = 3},new Account { Name = "Ringo", Value = 4}
};

}

}

public class Account

{
public string Name { get; set; }
public double Value { get; set; }
public override string ToString()
{
return Name + " " + Value;
}

}

public class CrossingConverter : IValueConverter

{
#region IValueConverter Membersobject IValueConverter.Convert(object value, Type targetType, object parameter, CultureInfo culture)
{

Account acct = value as Account;
if (acct != null)
{
return acct.Value;
}
return null;
}
object IValueConverter.ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
return null;
}

#endregion

}

}
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