Object reference not set to an instance of an object.

[sigmarsson]

Describe the bug
Several charts employed on a Pivot control and by changing among the pivots several times, this exception was thrown.

To Reproduce
Steps to reproduce the behavior:

    <Pivot>
        <Pivot.RightHeader>

        </Pivot.RightHeader>

        <PivotItem Header="Atmosphere">
            <view:chart/>
        </PivotItem>

        <PivotItem Header="Air Quality Index">
            <view:chart/>
        </PivotItem>

        <PivotItem Header="Total Precipitation">
            <view:chart/>
        </PivotItem>

        <PivotItem Header="Solar Radiation">
            <view:chart/>
        </PivotItem>

    </Pivot>

Screenshots

Desktop (please complete the following information):

• OS: Microsoft Windows [Version 10.0.22621.1265]

Additional context
v 701.

[sigmarsson]

The same occured again :

   at LiveChartsCore.Axis`3.InvalidateCrosshair(Chart`1 chart, LvcPoint pointerPosition)
   at LiveChartsCore.CartesianChart`1.InvokePointerMove(LvcPoint point)
   at LiveChartsCore.SkiaSharpView.WinUI.CartesianChart.OnPointerMoved(Object sender, PointerRoutedEventArgs e)
   at WinRT._EventSource_global__Microsoft_UI_Xaml_Input_PointerEventHandler.EventState.<GetEventInvoke>b__1_0(Object sender, PointerRoutedEventArgs e)
   at ABI.Microsoft.UI.Xaml.Input.PointerEventHandler.Do_Abi_Invoke(IntPtr thisPtr, IntPtr sender, IntPtr e)

[sigmarsson]

Will/can you fix it for 2.0 ?

[beto-rodriguez]

I am not completely sure if I got this fixed with a previous commit, but I am not able to reproduce this in the dev branch.

rc2 will be published soon luckily the issue will be gone there.

[beto-rodriguez]

I will close this for now since it seems fixed in rc2 version, feel free to reply or open a new issue if it persists.

[DamianSuess]

@beto-rodriguez out of curiosity, which version of .NET MAUI was this tested against without it throwing that error?

As a publisher myself, i'm sorry to report this as I don't like seeing this kind of comment pop up after the issue closed either.

• .NET MAUI v7
• Windows 10
• LiveCharts2-rc2

If I can this weekend, I'll try to dig in further on your latest branch

[DamianSuess]

@beto-rodriguez, for the issue that I am running into, I'm not sure if it's the same as the other folks.

For mine, it was on closing the application, with the CartesianChart no longer receiving updates for a live update.
The app is using .NET MAUI v7.0 running in WinUI.

When attempting to reproduce with the latest master, the closest I can relate to is closing the app while running the "General / MultiThread2" sample. However, that is throwing a different error. Just wanted to let you know, i'm still digging around to try & help out.

Thank you again Mr. Rodriguez! I love this user control

[beto-rodriguez]

That seems like a different issue, issue raised.

@DamianSuess That issue seems to be at SkiaSharp/MAUI (not sure yet), I will try to find a workaround for it, notice it does not happen on the WinUI control, it only occurs on MAUI (in Windows).

[DamianSuess]

Good call on splitting this one off. I'm still digging into my scenario as well
I appreciate you taking the time to take a peek.