Hello.
Sometimes instead of chart appears the red cross - see the attachment. I can't reproduce it stable, so I'm not able to provide code example here. Could you tell me, which reason may be for such behavior?

Hi Ereona,

Please provide more information - what is the platform, control verstion, are there any exceptions etc...

Best Regards,
Nevron Support Team

Dll's version is 12.5.9.12, OS is Windows 7. Unfortunately I can't tell anything about exceptions because this error reproduces only on user's PC so far.

Hi Ereona,

We'll need some code or application that reproduces the problem or stack trace of the generated exception to further investigate this issue.

Best Regards,
Nevron Support Team

Here are stack traces for two exceptions which happen during chart repainting. How to avoid them?


> mscorlib.dll!System.Collections.ArrayList.this[int].get(int index) + 0x74 bytes
Nevron.Chart.dll!Nevron.Chart.NContentPanel.RecalcChildPanelsLayout(Nevron.Chart.NChartRenderingContext context = {Nevron.Chart.NChartRenderingContext2D}) + 0x158 bytes
Nevron.Chart.dll!Nevron.Chart.NContentPanel.RecalcLayout(Nevron.Chart.NChartRenderingContext context = {Nevron.Chart.NChartRenderingContext2D}) + 0x32 bytes
Nevron.Chart.dll!Nevron.Chart.NRootPanel.RecalcLayout(Nevron.Chart.NChartRenderingContext context = {Nevron.Chart.NChartRenderingContext2D}) + 0x196 bytes
Nevron.Chart.dll!Nevron.Chart.NDocument.RecalcLayout(Nevron.Chart.NChartRenderingContext context = {Nevron.Chart.NChartRenderingContext2D}) + 0x15d bytes
Nevron.Chart.dll!Nevron.Chart.NDocument.Paint(Nevron.Chart.NChartRenderingContext context = {Nevron.Chart.NChartRenderingContext2D}, bool l1ll111l11I = false, bool recalc = true) + 0xa2 bytes
Nevron.Chart.dll!Nevron.Chart.l1II11IlIl.PaintContent() + 0x3b bytes
Nevron.Presentation.dll!Nevron.GraphicsCore.NBitmapGdiRenderSurface.Paint(object sender = {Nevron.Chart.WinForm.NChartControl}, System.Windows.Forms.PaintEventArgs e = {ClipRectangle = {System.Drawing.Rectangle}}, Nevron.GraphicsCore.l1ll11Il1 contentPainter = {Nevron.Chart.l1II11IlIl}) + 0x7c bytes
Nevron.Chart.dll!Nevron.Chart.WinForm.NControlView.Paint(object sender = {Nevron.Chart.WinForm.NChartControl}, System.Windows.Forms.PaintEventArgs e = {ClipRectangle = {System.Drawing.Rectangle}}) + 0x12f bytes
Nevron.Chart.WinForm.dll!Nevron.Chart.WinForm.NChartControl.OnPaint(System.Windows.Forms.PaintEventArgs e = {ClipRectangle = {System.Drawing.Rectangle}}) + 0x3d bytes
System.Windows.Forms.dll!System.Windows.Forms.Control.PaintWithErrorHandling(System.Windows.Forms.PaintEventArgs e, short layer) + 0xa1 bytes
System.Windows.Forms.dll!System.Windows.Forms.Control.WmPaint(ref System.Windows.Forms.Message m) + 0x342 bytes
System.Windows.Forms.dll!System.Windows.Forms.Control.WndProc(ref System.Windows.Forms.Message m) + 0x2b1 bytes
System.Windows.Forms.dll!System.Windows.Forms.Control.ControlNativeWindow.OnMessage(ref System.Windows.Forms.Message m) + 0x13 bytes
System.Windows.Forms.dll!System.Windows.Forms.Control.ControlNativeWindow.WndProc(ref System.Windows.Forms.Message m) + 0x31 bytes
System.Windows.Forms.dll!System.Windows.Forms.NativeWindow.DebuggableCallback(System.IntPtr hWnd, int msg = 15, System.IntPtr wparam, System.IntPtr lparam) + 0x64 bytes
[Native to Managed Transition]
[Managed to Native Transition]
WindowsBase.dll!System.Windows.Threading.Dispatcher.PushFrameImpl(System.Windows.Threading.DispatcherFrame frame = {System.Windows.Threading.DispatcherFrame}) + 0xc1 bytes
WindowsBase.dll!System.Windows.Threading.Dispatcher.PushFrame(System.Windows.Threading.DispatcherFrame frame) + 0x49 bytes
WindowsBase.dll!System.Windows.Threading.Dispatcher.Run() + 0x4c bytes
PresentationFramework.dll!System.Windows.Application.RunDispatcher(object ignore) + 0x17 bytes
PresentationFramework.dll!System.Windows.Application.RunInternal(System.Windows.Window window) + 0x6f bytes
PresentationFramework.dll!System.Windows.Application.Run(System.Windows.Window window) + 0x26 bytes
PresentationFramework.dll!System.Windows.Application.Run() + 0x1b bytes


> mscorlib.dll!System.Collections.ArrayList.this[int].get(int index) + 0x74 bytes
Nevron.Chart.dll!Nevron.Chart.NPanel.lIlIlII1ll.get() + 0x7e bytes
Nevron.Chart.dll!Nevron.Chart.WinForm.NControlView.lI1l1II1lI() + 0x9f bytes
Nevron.Chart.dll!Nevron.Chart.WinForm.NControlView.Paint(object sender = {Nevron.Chart.WinForm.NChartControl}, System.Windows.Forms.PaintEventArgs e = {ClipRectangle = {System.Drawing.Rectangle}}) + 0xb4 bytes
Nevron.Chart.WinForm.dll!Nevron.Chart.WinForm.NChartControl.OnPaint(System.Windows.Forms.PaintEventArgs e = {ClipRectangle = {System.Drawing.Rectangle}}) + 0x3d bytes
System.Windows.Forms.dll!System.Windows.Forms.Control.PaintWithErrorHandling(System.Windows.Forms.PaintEventArgs e, short layer) + 0xa1 bytes
System.Windows.Forms.dll!System.Windows.Forms.Control.WmPaint(ref System.Windows.Forms.Message m) + 0x342 bytes
System.Windows.Forms.dll!System.Windows.Forms.Control.WndProc(ref System.Windows.Forms.Message m) + 0x2b1 bytes
System.Windows.Forms.dll!System.Windows.Forms.Control.ControlNativeWindow.OnMessage(ref System.Windows.Forms.Message m) + 0x13 bytes
System.Windows.Forms.dll!System.Windows.Forms.Control.ControlNativeWindow.WndProc(ref System.Windows.Forms.Message m) + 0x31 bytes
System.Windows.Forms.dll!System.Windows.Forms.NativeWindow.DebuggableCallback(System.IntPtr hWnd, int msg = 15, System.IntPtr wparam, System.IntPtr lparam) + 0x64 bytes
[Native to Managed Transition]
[Managed to Native Transition]
WindowsBase.dll!System.Windows.Threading.Dispatcher.PushFrameImpl(System.Windows.Threading.DispatcherFrame frame = {System.Windows.Threading.DispatcherFrame}) + 0xc1 bytes
WindowsBase.dll!System.Windows.Threading.Dispatcher.PushFrame(System.Windows.Threading.DispatcherFrame frame) + 0x49 bytes
WindowsBase.dll!System.Windows.Threading.Dispatcher.Run() + 0x4c bytes
PresentationFramework.dll!System.Windows.Application.RunDispatcher(object ignore) + 0x17 bytes
PresentationFramework.dll!System.Windows.Application.RunInternal(System.Windows.Window window) + 0x6f bytes
PresentationFramework.dll!System.Windows.Application.Run(System.Windows.Window window) + 0x26 bytes
PresentationFramework.dll!System.Windows.Application.Run() + 0x1b bytes

Hi Ereona,

As mentioned above you need to provide an app relicating the problem to investigate this in detail. Most likely you automate the control from a thread different than the UI main thread and that's why get those errors. If this is the case you need to ensure the chart document is protected from simultaneous access:

nChartControl1.Document.Lock();

// chart modifications go here

nChartControl1.Document.Unlock();

Best Regards,
Nevron Support Team

Thank you for reply.