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NLog / NLog.Windows.Forms

NLog targets specific for Windows.Forms
BSD 3-Clause "New" or "Revised" License
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NullReferenceException in RichTextBoxTarget SendTheMessageToRichTextBox #147

Closed snakefoot closed 1 year ago

snakefoot commented 1 year ago

NLog through Microsoft.Extensions.Logging to write to a log file and a RichTextBox on the main application form. (Package versions: NLog.Extensions.Logging 5.3.2/NLog.Windows.Forms 5.2.0)

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
 ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at NLog.Windows.Forms.RichTextBoxTarget.SendTheMessageToRichTextBox(String logMessage, RichTextBoxRowColoringRule rule, LogEventInfo logEvent)
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Span`1& arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.Delegate.DynamicInvokeImpl(Object[] args)
   at System.Delegate.DynamicInvoke(Object[] args)
   at System.Windows.Forms.Control.InvokeMarshaledCallbackDo(ThreadMethodEntry tme)
   at System.Windows.Forms.Control.InvokeMarshaledCallbackHelper(Object obj)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Windows.Forms.Control.InvokeMarshaledCallback(ThreadMethodEntry tme)
   at System.Windows.Forms.Control.InvokeMarshaledCallbacks()
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.TextBoxBase.WndProc(Message& m)
   at System.Windows.Forms.RichTextBox.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, WM msg, IntPtr wparam, IntPtr lparam)
   at Interop.User32.DispatchMessageW(MSG& msg)
   at System.Windows.Forms.Application.ComponentManager.Interop.Mso.IMsoComponentManager.FPushMessageLoop(UIntPtr dwComponentID, msoloop uReason, Void* pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(msoloop reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(msoloop reason, ApplicationContext context)
   at System.Windows.Forms.Application.Run(Form mainForm)
   at MyLibrary.SingleInstance..ctor(Form mainForm, SingleInstanceTypes type) in C:\SandBox\Libraries\UI\Lear.UI\SingleInstance.cs:line 104
   at MyApp.Program.Main(String[] args) in C:\Sandbox\LPS3Services\Projects\MessageRouter\LPS.MessageRouter.Monitor\Program.cs:line 38

See also: https://stackoverflow.com/q/76789531/193178

Guessing BeginInvoke followed by CloseTarget doing detach will cause the NullReferenceException