3D-Chart crashes but 2D works...

[Dimi]

Hi,

i try to render WPF content with telerik chart-controls in VB6. This is possible if you are using the Microsoft Interop Forms Toolkit (http://msdn.microsoft.com/en-us/vbasic/bb419144.aspx). If i'm using the 2D controls everiting is fine. But if I switch to 3D I get a OutOfMemoryException or NullReferenceException.

Here is my XAML:

<UserControl x:Class="UserControl1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:charts="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Charting">
    <Grid>
        <charts:RadChart x:Name="MyChart"/>
    </Grid>
</UserControl>

This is the code-behind from the 2D version:

    Public Sub New()

        ' This call is required by the Windows Form Designer.
        InitializeComponent()

        ' Add any initialization after the InitializeComponent() call.
        MyChart.DefaultSeriesDefinition = New BarSeriesDefinition

        Dim itemSource As Double() = {5, 9, 17, 10, 11, 3, 12}
        MyChart.ItemsSource = itemSource

    End Sub

And here is the code-behind from the 3D version:

    Public Sub New()

        ' This call is required by the Windows Form Designer.
        InitializeComponent()

        ' Add any initialization after the InitializeComponent() call.
        MyChart.DefaultSeriesDefinition = New Bar3DSeriesDefinition

        Dim itemSource As Double() = {5, 9, 17, 10, 11, 3, 12}
        MyChart.ItemsSource = itemSource

        AddHandler MyChart.DefaultView.ChartArea.Loaded, AddressOf Me.RadChart_Loaded

    End Sub

    Private Sub RadChart_Loaded(ByVal sender As Object, ByVal e As RoutedEventArgs)

        Dim camera As New CameraExtension
        camera.SpinAxis = SpinAxis.XY
        camera.ZoomEnabled = True

        MyChart.DefaultView.ChartArea.Extensions.Add(camera)

    End Sub

The same code works in a normal .NET-project and also in a WinForms-project on the ElementHost.

Best regards,
Dimi

[Bartholomeo Rocca]

Hello Dimi,

This is one exotic setup you have here. It seems quite odd that your managed application is crashing with different kinds of exceptions on consecutive runs (NullReferenceException vs OutOfMemoryException). Also, as you have noted the same setup works seamlessly on the officially supported platforms (pure WPF setup and WinForms-hosted one) so I would suspect there is some problem with this particular toolkit when rendering 3D content. Have you verified the toolkit is capable of rendering generic WPF 3D content at all?


Greetings,
Bart.

[Dimi]

Hello Bart,

the toolkit has no problems with other 3D staff. Everything I've tested works well. It only crashes with the 3D-charts.

Best regards,
Dimi

[Dimi]

Hello Everyone,

I've solved the problem above. The .NET-Framework can't find the "Telerik.Windows.Controls.Charting.dll" in my setup. It works only if you put the assembly in the gac or if you're using the following methods at the beginning of your program (before using any chart):

    Private Sub LoadDependentAssemblies()
        Try
            Dim currentDomain As AppDomain = AppDomain.CurrentDomain

            AddHandler currentDomain.AssemblyResolve, AddressOf MyResolveEventHandler

            InstantiateTelerikAssemblies(currentDomain)

            RemoveHandler currentDomain.AssemblyResolve, AddressOf MyResolveEventHandler
        Catch ex As Exception
            'some error handling...
        End Try
    End Sub

    Private Sub InstantiateTelerikAssemblies(ByVal domain As AppDomain)
        Try
            ' create a dummy instance
            domain.CreateInstance("Telerik.Windows.Controls.Charting, Version=2009.3.1208.35, Culture=neutral, PublicKeyToken=5803cfa389c90ce7", "Telerik.Windows.Controls.RadChart")
        Catch e As Exception
        End Try
    End Sub

    Private Function MyResolveEventHandler(ByVal sender As Object, ByVal args As ResolveEventArgs) As [Assembly]
        Dim assemblyPath as String = "[the path of the assembly]"
        Return Assembly.LoadFrom(assemblyPath & "Telerik.Windows.Controls.Charting.dll"))
    End Function

Best regards,
Dimi