Hi,

I encounter a random issue with the HitTest method of NChartControl (Nevron 2010, DLL version is 10.3.31.12) . It raises a NullException and it's very difficult to reproduce. The chart is displaying a line plot and the hit test was done on coordinate (x,y) = (65,105). The context of the PreOrder paint didn't seem to contain null members (see content of the structure at the end).

CALLSTACK:

Nevron.Chart.dll!Nevron.Chart.NLineSeries.Render2D(Nevron.Chart.NChartRenderingContext2D context = {Nevron.Chart.NChartRenderingContext2D}, Nevron.Chart.l1I1Ill1l1 rf = RenderAll) + 0xa7 bytes
Nevron.Chart.dll!Nevron.Chart.l1I1111l1I.lI1llII1II(Nevron.Chart.NChartRenderingContext2D context = {Nevron.Chart.NChartRenderingContext2D}, Nevron.Chart.l1I1Ill1l1 rf = RenderAll, int lIII1l11II = 3, int lIII1l1Ill = 0, int lIII1l1Il1 = -1) + 0xa5 bytes
Nevron.Chart.dll!Nevron.Chart.l1I1111l1I.Render2D(Nevron.Chart.NChartRenderingContext2D context = {Nevron.Chart.NChartRenderingContext2D}, Nevron.Chart.l1I1Ill1l1 rf = RenderAll) + 0xa0 bytes
Nevron.Chart.dll!Nevron.Chart.NChart.RenderSeries2D(Nevron.Chart.NChartRenderingContext2D context = {Nevron.Chart.NChartRenderingContext2D}) + 0x61 bytes
Nevron.Chart.dll!Nevron.Chart.NCartesianChart.lIl1I1IIll(Nevron.Chart.NChartRenderingContext2D context = {Nevron.Chart.NChartRenderingContext2D}) + 0x14a bytes
Nevron.Chart.dll!Nevron.Chart.NChart.PreOrderPaint2D(Nevron.Chart.NChartRenderingContext2D context = {Nevron.Chart.NChartRenderingContext2D}) + 0x5b bytes
Nevron.Chart.dll!Nevron.Chart.NCartesianChart.PreOrderPaint2D(Nevron.Chart.NChartRenderingContext2D context = {Nevron.Chart.NChartRenderingContext2D}) + 0x5e bytes
xxx.Standard.dll!xxx.Standard.CartesianChart.PreOrderPaint2D(Nevron.Chart.NChartRenderingContext2D context = {Nevron.Chart.NChartRenderingContext2D}) Line 73 + 0xc bytes C#
Nevron.Chart.dll!Nevron.Chart.NContentPanel.RenderInternal(Nevron.Chart.NChartRenderingContext context = {Nevron.Chart.NChartRenderingContext2D}) + 0x18a bytes
Nevron.Chart.dll!Nevron.Chart.NPanel.PartialRender(Nevron.Chart.NChartRenderingContext context = {Nevron.Chart.NChartRenderingContext2D}) + 0x136 bytes
Nevron.Chart.dll!Nevron.Chart.NPanel.UpdateImageMap(Nevron.Chart.NChartRenderingContext context = {Nevron.Chart.NChartRenderingContext2D}, Nevron.GraphicsCore.lI111l11 imageMap = null) + 0xb9 bytes
Nevron.Chart.dll!Nevron.Chart.NChart.HitTest(Nevron.Chart.NChartRenderingContext context = {Nevron.Chart.NChartRenderingContext2D}, Nevron.GraphicsCore.NPointF pt = {X=62,Y=105}) + 0xca bytes
Nevron.Chart.dll!Nevron.Chart.NDocument.HitTest(Nevron.Chart.NChartRenderingContext context = {Nevron.Chart.NChartRenderingContext2D}, Nevron.GraphicsCore.NPointF point = {X=62,Y=105}) + 0xe3 bytes
Nevron.Chart.dll!Nevron.Chart.NDocument.lIlII11Il1(Nevron.Chart.NChartRenderingContext context = {Nevron.Chart.NChartRenderingContext2D}, Nevron.GraphicsCore.NPointF point = {X=62,Y=105}) + 0x35 bytes
Nevron.Chart.WinForm.dll!Nevron.Chart.WinForm.NChartControl.HitTest(int x = 62, int y = 105) + 0x82 bytes
> xxx.Standard.dll!xxx.Standard.DataPlot.HitTest(int x = 62, int y = 105) Line 5592 + 0x1c bytes C#


Content of NChartRenderingContext2D (for PreOrderPaint2D).

- context {Nevron.Chart.NChartRenderingContext2D} Nevron.Chart.NChartRenderingContext2D
- base {Nevron.Chart.NChartRenderingContext2D} Nevron.Chart.NChartRenderingContext {Nevron.Chart.NChartRenderingContext2D}
lIl111l1I1 false bool
+ lIl111l1II {Width=522,Height=549} Nevron.GraphicsCore.NSize
+ lIl111lIll {DpiX=96, DpiY=96} Nevron.GraphicsCore.NResolution
+ RenderSurface {Nevron.GraphicsCore.lI1I111l} Nevron.GraphicsCore.l1Ill1lI {Nevron.GraphicsCore.lI1I111l}
+ Non-Public members
- Device {Nevron.GraphicsCore.lII1lIlI} Nevron.GraphicsCore.lIIIIllI {Nevron.GraphicsCore.lII1lIlI}
+ [Nevron.GraphicsCore.lII1lIlI] {Nevron.GraphicsCore.lII1lIlI} Nevron.GraphicsCore.lII1lIlI
+ AnimationBounds {X=0, Y=0, Width=0, Height=0} Nevron.GraphicsCore.NRectangleF
+ AnimationsStyle null Nevron.GraphicsCore.NAnimationsStyle
AutoAnimations false bool
+ ClipBounds {X=-1E+08, Y=-1E+08, Width=2E+08, Height=2E+08} Nevron.GraphicsCore.NRectangleF
ClipInfo null Nevron.GraphicsCore.l1III11l
DashMode Cycle Nevron.GraphicsCore.DeviceDashMode
DashOffset 0.0 float
ExcludedRegionFromImageFilters null System.Drawing.Region
+ FillStyle null Nevron.GraphicsCore.NFillStyle
+ FontStyle {Nevron.GraphicsCore.NFontStyle} Nevron.GraphicsCore.NFontStyle
+ GDIObjectsCache {Nevron.GraphicsCore.NGDIObjectsCache} Nevron.GraphicsCore.NGDIObjectsCache
ImageFiltersBoundsProvider null Nevron.GraphicsCore.lIIIIII1
ImageFiltersStyle null Nevron.GraphicsCore.NImageFiltersStyle
ImageRenderingMode Default Nevron.GraphicsCore.ImageRenderingMode
+ MeasurementUnit {Pixel} Nevron.GraphicsCore.NMeasurementUnit {Nevron.GraphicsCore.NPixelGraphicsUnit}
PageScale 1.0 float
PageUnit Display System.Drawing.GraphicsUnit
+ Painter {Nevron.GraphicsCore.lI1lII1I} Nevron.GraphicsCore.lIIIIl1I {Nevron.GraphicsCore.lI1lII1I}
+ ReusableGraphicsPath {System.Drawing.Drawing2D.GraphicsPath} System.Drawing.Drawing2D.GraphicsPath
ShapeRenderingMode Default Nevron.GraphicsCore.ShapeRenderingMode
+ SharedFont {Nevron.GraphicsCore.lIl1l1I1} Nevron.GraphicsCore.lIl1l1I1
+ SharedStringFormat {Nevron.GraphicsCore.l1I1ll1I} Nevron.GraphicsCore.l1I1ll1I
+ StringFormatStyle {Nevron.GraphicsCore.NStringFormatStyle} Nevron.GraphicsCore.NStringFormatStyle
+ StrokeStyle null Nevron.GraphicsCore.NStrokeStyle
SupportsAnimation false bool
TextRenderingMode Auto Nevron.GraphicsCore.TextRenderingMode
TextureBoundsProvider null Nevron.GraphicsCore.lIIIIII1
TextureMappingOrientation 0.0 float
+ Transform {System.Drawing.Drawing2D.Matrix} System.Drawing.Drawing2D.Matrix
+ ShadowDevice {Nevron.GraphicsCore.lI1lI1I1} Nevron.GraphicsCore.IN2DShadowDevice {Nevron.GraphicsCore.lI1lI1I1}
+ Non-Public members


Some add. info that I obtained with mdbg:

[p#:0, t#:0] mdbg> p
local_0=Nevron.GraphicsCore.DeviceDashMode
local_1=
this=Nevron.Chart.NLineSeries
context=Nevron.Chart.NChartRenderingContext2D
rf=Nevron.Chart.l1I1Ill1l1