Tag: nullReferenceException

Hi!

I have the following code for a vertical slice modifier

    <s:VerticalSliceModifier Name="sliceModifier"
                                             ReceiveHandledEvents="True"
                                             >
                        <s:VerticalSliceModifier.VerticalLines>
                            <s:VerticalLineAnnotation Style="{StaticResource sliceStyle}"
                                                      X1="{Binding ParentViewModel.SliceModifierPosition, Mode=TwoWay}" />
                        </s:VerticalSliceModifier.VerticalLines>

 </s:VerticalSliceModifier>

This results in a nullreference exception. When I remove the VerticalLines, there is no nullreference exception, also no vertical lines.
As far as I can see ParentViewModel.SliceModifierPosition, does not have a value at the time.

I tried setting the visibility of the slicemodifier to collapsed, but it did not help the exception. Is there any to remove the slicemodifier for the time when X1 is not valid (using MVVM and not binding the slicemodifier itself)?

nullreference exception location

Abt.Controls.SciChart.ChartModifiers.VerticalSliceModifier.TB()
: Abt.Controls.SciChart.ChartModifiers.VerticalSliceModifier.OnAttached()
: Abt.Controls.SciChart.ChartModifiers.ModifierGroup.TB(IChartModifier C)
: Abt.Controls.SciChart.Common.Extensions.EnumerableExtensions. <a href="IEnumerable1 , Action1″>
: Abt.Controls.SciChart.ChartModifiers.ModifierGroup.TB(IEnumerable`1 C)

I’m currently trying to adapt an example to post here as an example repro– But in the meantime I figured I’d post and see if there are any fundamental problems with trying to do this.

The exception message states:

Additional information: Cannot get data-value from coordinate as the associated Axis is null

We are getting a NullReferenceException at OnRenderSurfaceBaseLoaded(Object sender, RoutedEventArgs e) in Direct3D10RenderSurface.

On calling:

if (Direct3D10CompatibilityHelper.SupportsDirectX10)
        {
            // quickest one and optically on par with high quality or xaml rendering
            return new Direct3D10RenderSurface();
        }

System:
Windows 8: Version 6.2.9200.0
CLR version: 4.0.30319.42000

see Stacktrace:

---

Stack trace

System.NullReferenceException: Object reference not set to an instance of an object.
----------------------------------------------------------------------
at SciChart.Drawing.DirectX.Context.D3D10.Direct3D10RenderSurface.OnRenderSurfaceBaseLoaded(Object sender, RoutedEventArgs e): 
----------------------------------------------------------------------
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised): 
----------------------------------------------------------------------
at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args): 
----------------------------------------------------------------------
at System.Windows.BroadcastEventHelper.BroadcastEvent(DependencyObject root, RoutedEvent routedEvent): 
----------------------------------------------------------------------
at System.Windows.BroadcastEventHelper.BroadcastLoadedEvent(Object root): 
----------------------------------------------------------------------
at MS.Internal.LoadedOrUnloadedOperation.DoWork(): 
----------------------------------------------------------------------
at System.Windows.Media.MediaContext.FireLoadedPendingCallbacks(): 
----------------------------------------------------------------------
at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks(): 
----------------------------------------------------------------------
at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget): 
----------------------------------------------------------------------
at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget): 
----------------------------------------------------------------------
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs): 
----------------------------------------------------------------------
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler): 

Any help?

Hi, i’m developing an app in WPF and i found that it crashes when i’m dereferencing the user control where my chart lives in and have 1 or more points selected by code in one chart when the other one is not visible.

i would be very apreciated if someone could tell me a hint of where i have to look for the solution or what do this methods do or touch.

more data about the chart:

• I have 2 fastlinerenderable series each with 2 Yaxis for itselves and 2 shared XAxis.
• I also have a modified listbox which is have it’s sincronization synced to the chart.
• have a modifiergroup to pan,zoom and select.

this is my Selectionmodifier:

<scicharts:DataPointSelectionModifier
                        Name="ChartSelection"
                        SelectionFill="#B1B5B2B2" 
                        XAxisId="{Binding XAxisType, NotifyOnTargetUpdated=True}"
                        TargetUpdated="ChartSelection_TargetUpdated"
                        SelectionStroke="#009E9C9C"
                        IsEnabled="{Binding SelectionMode}" >

I think that this is the axis that breaks my program but it needs it to not crash when i select.

this is my stacktrace:

An unhandled exception of type ‘System.NullReferenceException’ occurred in SciChart.Charting.dll

en SciChart.Charting.ChartModifiers.DataPointSelectionModifier.DeselectAllPointMarkers()
en SciChart.Charting.ChartModifiers.DataPointSelectionModifier.OnXAxisIdDependencyPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)

I tried to make a program that could replicate the error but i couldn’t.

thanks in advance.

hello, i have an exception.
see the try catch

public class CategoryDateTimeAxisEx : CategoryDateTimeAxis
{
    public override IComparable GetDataValue(double pixelCoordinate)
    {
        var dataValue = DateTime.MinValue;

        var coordCalc = GetCurrentCoordinateCalculator();
        if (coordCalc != null)
        {
            // Returns the index of a dataPoint, need to transform it to a dataValue
            var value = coordCalc.GetDataValue(pixelCoordinate);

            var catCoordCalc = coordCalc as ICategoryCoordinateCalculator<DateTime>;
            try
            {
                dataValue = catCoordCalc?.TransformIndexToData((int)value) ?? value.ToDateTime();
            }
            catch (Exception e)
            {
                 //TransformIndexToData() throw exception because catCoordCalc.BaseXValues is null,
                 //it only happend when my mouse over SciSurface and move faster on app startup
            } 
        }
        return dataValue;
    }
}

I use this class and override function now, it can work .but i don’t like this way.