NullReference Exception on Windows 7 and Windows Vista

[prayaggandhi]

Dear SoftwareFX,

We are using ChartFX for .NET version 6.2 with all the latest updates in our application. We have been struggling with the following error for a year now and we cannot seem to trace the problem. Based on exception we know that it's an internal error to ChartFX. It is expecting us to supply something concrete and we are not doing that. Please note that though this exception only happens on Windows 7 and Windows Vista. On Windows XP we never see this issue. No code change happens between different versions.

Here is the stack trace of an error and an exception. Any help on this issue is greatly appreciated.

************** Exception Text **************

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.NullReferenceException: Object reference not set to an instance of an object.

at SoftwareFX.ChartFX.Annotation.AnnotationList.0O(IGraphicsEx AQ, Rectangle AR, Boolean AS, Boolean AT, Int32 AU, Int32 AV)

at SoftwareFX.ChartFX.Annotation.AnnotationX.24(IGraphicsEx F3, Rectangle F4, Boolean F5, Int32 F6, Int32 F7)

--- End of inner exception stack trace ---

at System.RuntimeMethodHandle._InvokeMethodFast(Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner)

at System.RuntimeMethodHandle.InvokeMethodFast(Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner)

at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)

at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)

at SoftwareFX.ChartFX.ExtensionManager.MI(19 2CA, Enum 2CB, Object[] 2CC)

at SoftwareFX.ChartFX.ChartCore.EP(1R 1T1, Boolean 1T2, Boolean 1T3)

at SoftwareFX.ChartFX.ChartCore.EO(1R 1SY, Rectangle& 1SZ, Int32& 1T0)

at SoftwareFX.ChartFX.ChartCore.EN(PaintBar 1SV, IGraphicsEx 1SW, Rectangle& 1SX)

at SoftwareFX.ChartFX.0X.OnPaint(PaintEventArgs e)

at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer, Boolean disposeEventArgs)

at System.Windows.Forms.Control.WmPaint(Message& m)

at System.Windows.Forms.Control.WndProc(Message& m)

at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)

at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)

at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Thanks,

[Frank]

Can you provide a sample app that reproduces the problem? Or you can contact support directly and provide them with a simplified version of your app

[prayaggandhi]

Frank,

Attached is the sample app that reproduces the issue on Windows 7... Please navigate between Exmaple 1 and Exmaple 2 code few times and you should see the exception...

Thanks.

Prayag