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<span class='shl'></span>SnippetHi , I have a WPF page that shows a chart with multiple line series , recently I got ' UnhandledException ' exception error written in log file , and whole application shut downed , actually it happened multiple times before , here is the exception detail :
Type: System.OutOfMemoryException
Message: Out of memory.
StackTrace:
at System.Drawing.Graphics.CheckErrorStatus(Int32 status)
at System.Drawing.Graphics.DrawImage(Image image, Int32 x, Int32 y, Int32 width, Int32 height)
at System.Drawing.Graphics.DrawImage(Image image, Rectangle rect)
at Nevron.Chart.Wpf.NWpfGdiRenderSurface.Paint(DrawingContext context, NWpfChartControlView view)
at Nevron.Chart.Wpf.NWpfChartControlView.Paint(DrawingContext drawingContext)
at Nevron.Chart.Wpf.NChartControl.OnRender(DrawingContext drawingContext)
at System.Windows.UIElement.Arrange(Rect finalRect)
at System.Windows.ContextLayoutManager.UpdateLayout()
at System.Windows.ContextLayoutManager.UpdateLayoutCallback(Object arg)
at System.Windows.Media.MediaContext.InvokeOnRenderCallback.DoWork()
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)
at System.Windows.Threading.DispatcherOperation.InvokeImpl()
at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state)
at System.Windows.Threading.DispatcherOperation.Invoke()
at System.Windows.Threading.Dispatcher.ProcessQueue()
at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
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)
at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
at System.Windows.Application.RunDispatcher(Object ignore)
at System.Windows.Application.RunInternal(Window window)
at System.Windows.Application.Run(Window window)
at System.Windows.Application.Run()
at MyChartApp.App.Main()
I was wondering what causes ' out of & nbsp ; memory ' exception error ? Here is my code :
internal partial class ChartView
{
public ChartView()
{
_lines = new NLineSeries[Vm.GraphOptions.Count];
_axis = new NAxis[Vm.GraphOptions.Count];
CreateChart();
t = new DispatcherTimer {Interval = TimeSpan.FromSeconds(1)};
t.Tick += (s, e) =>
{
try
{
GenerateLabels();
for (var i = 0; i < Vm.GraphOptions.Count; i++)
{
_lines[i].Visible = Vm.GraphOptions[i].IsChecked;
_axis[i].Visible = Vm.GraphOptions[i].IsChecked;
}
NChartControl1.Refresh();
}
catch (Exception ex)
{
SystemLog.WriteLine(ex);
}
};
t.Start();
}
public void CreateChart()
{
NChartControl1.Charts.Clear();
NChartControl1.Charts.Add(new NCartesianChart());
_chart = (NCartesianChart)NChartControl1.Charts[0];
NChartControl1.DataBindingManager.EnableDataBinding = true;
NChartControl1.Legends.Clear();
NChartControl1.BackgroundStyle.FrameStyle.Visible = false;
_chart.DockMode = PanelDockMode.Fill;
_chart.BoundsMode = BoundsMode.Stretch;
_chart.Padding = new NMarginsL(0);
_chart.Margins = new NMarginsL(5, 10, 5, 5);
_chart.Axis(StandardAxis.PrimaryY).Visible = false;
_chart.Axis(StandardAxis.SecondaryY).Visible = false;
_chart.Axis(StandardAxis.PrimaryX).ScaleConfigurator = new NLinearScaleConfigurator();
var linearScale = new NLinearScaleConfigurator(); ;
linearScale.RulerStyle.BorderStyle.Color = Color.White;
_chart.Axis(StandardAxis.PrimaryY).ScaleConfigurator = linearScale;
_chart.Axis(StandardAxis.SecondaryY).ScaleConfigurator = linearScale;
int i = 0;
foreach (var cr in Vm.GraphOptions)
{
var axis = CreateAxis(_chart, true, 0, 100, 0, GetCurveMax(cr.DisplayName), cr.DisplayName, GetCurveColor(cr.DisplayName));
var line = CreateLineSeries(GetCurveColor(cr.DisplayName));
_chart.Series.Add(line);
line.DisplayOnAxis(StandardAxis.PrimaryY, false);
line.DisplayOnAxis(StandardAxis.SecondaryY, false);
line.DisplayOnAxis(axis.AxisId, true);
_axis[i] = axis;
_lines[i] = line;
i++;
}
GenerateLabels();
BindingChartToData();
var sc = (NLinearScaleConfigurator)_chart.Axis(StandardAxis.PrimaryX).ScaleConfigurator;
sc.Title.Text = "min";
sc.MajorGridStyle.SetShowAtWall(ChartWallType.Back, true);
sc.MajorGridStyle.LineStyle.CustomPattern = 0x5555;
sc.MajorGridStyle.LineStyle.Factor = 2;
sc.MajorGridStyle.LineStyle.Color = Color.White; // Color.Gray;
sc.MajorGridStyle.LineStyle.Width = new NLength(0.5f, NGraphicsUnit.Point);
sc.MajorGridStyle.LineStyle.Pattern = LinePattern.Custom;
NChartControl1.Refresh();
}
private static NLineSeries CreateLineSeries(Color color)
{
var line = new NLineSeries
{
UseXValues = true,
DataLabelStyle = { Visible = false },
BorderStyle = { Color = color, Width = new NLength(2) },
SamplingMode = SeriesSamplingMode.Enabled,
};
return line;
}
private static NAxis CreateAxis(NCartesianChart chart, bool createLevel, float beginPercent, float endPercent, double min, double max, string title, Color color)
{
NAxis axis = ((NCartesianAxisCollection)chart.Axes).AddCustomAxis(AxisOrientation.Vertical, AxisDockZone.FrontLeft);
axis.Visible = true;
axis.Anchor.BeginPercent = beginPercent;
axis.Anchor.EndPercent = endPercent;
((NDockAxisAnchor)axis.Anchor).CreateNewZoneLevel = createLevel;
axis.View = new NRangeAxisView(new NRange1DD(min, max), true, true);
var linearScale = new NLinearScaleConfigurator();
linearScale.MajorTickMode = MajorTickMode.CustomTicks;
linearScale.CustomMajorTicks.Add(min);
linearScale.CustomMajorTicks.Add(max);
linearScale.Title.Text = title;
linearScale.Title.TextStyle.FillStyle = new NColorFillStyle(color);
linearScale.RulerStyle.BorderStyle.Color = color;
linearScale.InnerMajorTickStyle.LineStyle.Color = color;
linearScale.OuterMajorTickStyle.LineStyle.Color = color;
linearScale.LabelStyle.TextStyle.FillStyle = new NColorFillStyle(color);
linearScale.CustomStep = max / 10;
linearScale.MajorTickMode = MajorTickMode.CustomStep;
linearScale.MajorGridStyle.SetShowAtWall(ChartWallType.Back, true);
linearScale.MajorGridStyle.LineStyle.CustomPattern = 0x5555;
linearScale.MajorGridStyle.LineStyle.Factor = 2;
linearScale.MajorGridStyle.LineStyle.Color = Color.White; // Color.Gray;
linearScale.MajorGridStyle.LineStyle.Width = new NLength(0.5f, NGraphicsUnit.Point);
linearScale.MajorGridStyle.LineStyle.Pattern = LinePattern.Custom;
axis.ScaleConfigurator = linearScale;
return axis;
}
private void GenerateLabels()
{
try
{
_scaleConfiguratorX = (NLinearScaleConfigurator) _chart.Axis(StandardAxis.PrimaryX).ScaleConfigurator;
double start = 0.0;
double end = 0.0;
lock (LockTimeBasedPoints)
{
var count = TimeBasedPoints.Rows.Count - 1;
if (count <= 0) return;
end = double.Parse(TimeBasedPoints.Rows[count]["X"].ToString());
}
_scaleConfiguratorX.MajorTickMode = MajorTickMode.CustomStep;
var step = end/20;
if (step < 1) step = 1;
step = Math.Round(step, 0);
_scaleConfiguratorX.CustomStep = step;
}
catch (Exception ex)
{
SystemLog.WriteLine(ex);
}
}
private void BindingChartToData()
{
int i = 0;
foreach (var cr in Vm.GraphOptions)
{
NChartControl1.DataBindingManager.AddBinding(0, i, "XValues", TimeBasedPoints, "X");
NChartControl1.DataBindingManager.AddBinding(0, i, "Values", TimeBasedPoints, GetMinName(cr.DisplayName));
i++;
}
NChartControl1.DataBindingManager.UpdateChartControl();
}
}
internal partial class ChartView
{
public ChartView()
{
_lines = new NLineSeries[Vm.GraphOptions.Count];
_axis = new NAxis[Vm.GraphOptions.Count];
CreateChart();
t = new DispatcherTimer {Interval = TimeSpan.FromSeconds(1)};
t.Tick += (s, e) =>
{
try
{
GenerateLabels();
for (var i = 0; i < Vm.GraphOptions.Count; i++)
{
_lines[i].Visible = Vm.GraphOptions[i].IsChecked;
_axis[i].Visible = Vm.GraphOptions[i].IsChecked;
}
NChartControl1.Refresh();
}
catch (Exception ex)
{
SystemLog.WriteLine(ex);
}
};
t.Start();
}
public void CreateChart()
{
NChartControl1.Charts.Clear();
NChartControl1.Charts.Add(new NCartesianChart());
_chart = (NCartesianChart)NChartControl1.Charts[0];
NChartControl1.DataBindingManager.EnableDataBinding = true;
NChartControl1.Legends.Clear();
NChartControl1.BackgroundStyle.FrameStyle.Visible = false;
_chart.DockMode = PanelDockMode.Fill;
_chart.BoundsMode = BoundsMode.Stretch;
_chart.Padding = new NMarginsL(0);
_chart.Margins = new NMarginsL(5, 10, 5, 5);
_chart.Axis(StandardAxis.PrimaryY).Visible = false;
_chart.Axis(StandardAxis.SecondaryY).Visible = false;
_chart.Axis(StandardAxis.PrimaryX).ScaleConfigurator = new NLinearScaleConfigurator();
var linearScale = new NLinearScaleConfigurator(); ;
linearScale.RulerStyle.BorderStyle.Color = Color.White;
_chart.Axis(StandardAxis.PrimaryY).ScaleConfigurator = linearScale;
_chart.Axis(StandardAxis.SecondaryY).ScaleConfigurator = linearScale;
int i = 0;
foreach (var cr in Vm.GraphOptions)
{
var axis = CreateAxis(_chart, true, 0, 100, 0, GetCurveMax(cr.DisplayName), cr.DisplayName, GetCurveColor(cr.DisplayName));
var line = CreateLineSeries(GetCurveColor(cr.DisplayName));
_chart.Series.Add(line);
line.DisplayOnAxis(StandardAxis.PrimaryY, false);
line.DisplayOnAxis(StandardAxis.SecondaryY, false);
line.DisplayOnAxis(axis.AxisId, true);
_axis[i] = axis;
_lines[i] = line;
i++;
}
GenerateLabels();
BindingChartToData();
var sc = (NLinearScaleConfigurator)_chart.Axis(StandardAxis.PrimaryX).ScaleConfigurator;
sc.Title.Text = "min";
sc.MajorGridStyle.SetShowAtWall(ChartWallType.Back, true);
sc.MajorGridStyle.LineStyle.CustomPattern = 0x5555;
sc.MajorGridStyle.LineStyle.Factor = 2;
sc.MajorGridStyle.LineStyle.Color = Color.White; // Color.Gray;
sc.MajorGridStyle.LineStyle.Width = new NLength(0.5f, NGraphicsUnit.Point);
sc.MajorGridStyle.LineStyle.Pattern = LinePattern.Custom;
NChartControl1.Refresh();
}
private static NLineSeries CreateLineSeries(Color color)
{
var line = new NLineSeries
{
UseXValues = true,
DataLabelStyle = { Visible = false },
BorderStyle = { Color = color, Width = new NLength(2) },
SamplingMode = SeriesSamplingMode.Enabled,
};
return line;
}
private static NAxis CreateAxis(NCartesianChart chart, bool createLevel, float beginPercent, float endPercent, double min, double max, string title, Color color)
{
NAxis axis = ((NCartesianAxisCollection)chart.Axes).AddCustomAxis(AxisOrientation.Vertical, AxisDockZone.FrontLeft);
axis.Visible = true;
axis.Anchor.BeginPercent = beginPercent;
axis.Anchor.EndPercent = endPercent;
((NDockAxisAnchor)axis.Anchor).CreateNewZoneLevel = createLevel;
axis.View = new NRangeAxisView(new NRange1DD(min, max), true, true);
var linearScale = new NLinearScaleConfigurator();
linearScale.MajorTickMode = MajorTickMode.CustomTicks;
linearScale.CustomMajorTicks.Add(min);
linearScale.CustomMajorTicks.Add(max);
linearScale.Title.Text = title;
linearScale.Title.TextStyle.FillStyle = new NColorFillStyle(color);
linearScale.RulerStyle.BorderStyle.Color = color;
linearScale.InnerMajorTickStyle.LineStyle.Color = color;
linearScale.OuterMajorTickStyle.LineStyle.Color = color;
linearScale.LabelStyle.TextStyle.FillStyle = new NColorFillStyle(color);
linearScale.CustomStep = max / 10;
linearScale.MajorTickMode = MajorTickMode.CustomStep;
linearScale.MajorGridStyle.SetShowAtWall(ChartWallType.Back, true);
linearScale.MajorGridStyle.LineStyle.CustomPattern = 0x5555;
linearScale.MajorGridStyle.LineStyle.Factor = 2;
linearScale.MajorGridStyle.LineStyle.Color = Color.White; // Color.Gray;
linearScale.MajorGridStyle.LineStyle.Width = new NLength(0.5f, NGraphicsUnit.Point);
linearScale.MajorGridStyle.LineStyle.Pattern = LinePattern.Custom;
axis.ScaleConfigurator = linearScale;
return axis;
}
private void GenerateLabels()
{
try
{
_scaleConfiguratorX = (NLinearScaleConfigurator) _chart.Axis(StandardAxis.PrimaryX).ScaleConfigurator;
double start = 0.0;
double end = 0.0;
lock (LockTimeBasedPoints)
{
var count = TimeBasedPoints.Rows.Count - 1;
if (count <= 0) return;
end = double.Parse(TimeBasedPoints.Rows[count]["X"].ToString());
}
_scaleConfiguratorX.MajorTickMode = MajorTickMode.CustomStep;
var step = end/20;
if (step < 1) step = 1;
step = Math.Round(step, 0);
_scaleConfiguratorX.CustomStep = step;
}
catch (Exception ex)
{
SystemLog.WriteLine(ex);
}
}
private void BindingChartToData()
{
int i = 0;
foreach (var cr in Vm.GraphOptions)
{
NChartControl1.DataBindingManager.AddBinding(0, i, "XValues", TimeBasedPoints, "X");
NChartControl1.DataBindingManager.AddBinding(0, i, "Values", TimeBasedPoints, GetMinName(cr.DisplayName));
i++;
}
NChartControl1.DataBindingManager.UpdateChartControl();
}
}
I have maximum 100 data point per second for each line series , and maximum 12 line series will be shown at the same chart . chart will refresh every second in a timer . by the way this exception wont happen a lot , only some days . Nevron Chart : 16 . 9 . 27 . 12 ( WPF ) . NET : 4 . 5 . 1
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Group: Forum Members
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Posts: 3,055,
Visits: 4,052
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Hi Kianoosh, We haven ' t been able to replicate such a problem with the new version - have you tested with the most recent release whether you still experience it ? Also please send us an app that replicates the problem at support@nevron.com as the below code does not compile - if we manage to replicate the problem it will be fixed as soon as possible .
Best Regards,
Nevron Support Team
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Last Active: 6 Years Ago
Posts: 3,
Visits: 111
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I'm using version 2016, but I will try newer version. As I said before this exception comes very rarely, like once a week, but it's annoying and need to fix it. I was hoping you could tell me whats wrong by seeing StackTrace of the exception. Anyway I already sent you an email with a simplified version of my program attached to it. Thanks in advanced.
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Last Active: Last Month
Posts: 3,055,
Visits: 4,052
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Hi Kianoosh , We were not able to reproduce the problem with the chart itself . However we noticed that you ' re constantly adding data rows to the table and they are never deleted . This will surely cause memory problems at some point ...
Best Regards,
Nevron Support Team
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Group: Forum Members
Last Active: 6 Years Ago
Posts: 3,
Visits: 111
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I'm sorry, the code I sent you was a portion of my bigger program, that I couldn't send, but the rows in DataTable will get deleted at some point. There will be at most 7500 rows or about 100,000 data points that will be bind to chart. I think NOV Chart can handle that much. However, is there any other way, other than DataTable, to bind to chart?
Is it possible that showing a lot of data points in a single chart without zooming or scrolling leads to 'out of memory' exception?
I'm saying this because as I adding more rows to the table it will take longer to refresh chart.
and one more question:
All my data points are type 'double', What will happen if we give a NaN (not a number) or a Infinity value as a data point to the chart? How NOV chart handle those values?
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Group: Forum Members
Last Active: Last Month
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Hi Kianoosh , We would like to first rule out the possibility that this is a purely GDI + ( MS ) problem . For this purpose please run the app in hardware accelerated mode : nChartControl1 . Settings . RenderSurface = RenderSurface . Window ; if it does not throw an exception after a week or so then this is a GDI + problem . Let us know if the problem persists ...
Best Regards,
Nevron Support Team
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