'System.NullReferenceException' occurred in Syncfusion.SfGrid.WPF.dll

[Amit Saraf]

Hi,

I'm receiving strange error sometime when I'm trying to show Group Drop Area through c# code

System.NullReferenceException: 'Object reference not set to an instance of an object.'

An unhandled exception of type 'System.NullReferenceException' occurred in Syncfusion.SfGrid.WPF.dll

Object reference not set to an instance of an object.

Call Stack

========

System.NullReferenceException

HResult=0x80004003

Message=Object reference not set to an instance of an object.

Source=Syncfusion.SfGrid.WPF

StackTrace:

at Syncfusion.UI.Xaml.Grid.GroupDropArea.InitializeGroupDropAreaPanel()

at Syncfusion.UI.Xaml.Grid.GroupDropArea.OnApplyTemplate()

at System.Windows.FrameworkElement.ApplyTemplate()

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Border.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV)

at System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV, Boolean& hasDesiredSizeUChanged)

at System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV)

at System.Windows.Controls.Grid.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

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 MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(Object obj)

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 eAccounts.App.Main()

I'm unable to find exactly what is happening as I'm not encountering this error regularly

Hope information provided is sufficient.

Amit Saraf

[Deivaselvan Y]

Hi Amit,

Thank you for contacting Syncfusion support.

We are unable to reproduce the reported exception issue while enabling the ShowGroupDropArea in code behind. However, support incident to track the status of this defect has been created under your account. 

Please log on to our support website to check for further updates.

http://www.syncfusion.com/Account/Logon?ReturnUrl=%2fsupport%2fdirecttrac/  

Regards,
Deivaselvan