How to resolve this System IO FileNotFoundException

Question

The error only happens in production  not in debugging   The error only happens on the first application run after Windows login   The error occurs when we click BtnUseDesktop and thus fire the BtnUseDesktop Click event  below   The Event Viewer stack starts with the The Application Name Main   method    but our code does not have that method  it s a WPF application     Event Viewer   Application  The Application Name exe  Framework Version  v4 0 30319  Description  The process was terminated due to an unhandled exception   Exception Info  System IO FileNotFoundException  Stack      at MS Internal Threading ExceptionFilterHelper TryCatchWhen        System Object  System Delegate  System Object  Int32  System Delegate      at System Windows Threading Dispatcher LegacyInvokeImpl        System Windows Threading DispatcherPriority  System TimeSpan         System Delegate  System Object  Int32      at MS Win32 HwndSubclass SubclassWndProc IntPtr  Int32  IntPtr  IntPtr      at MS Win32 UnsafeNativeMethods DispatchMessage System Windows Interop MSG ByRef      at System Windows Threading Dispatcher PushFrameImpl        System Windows Threading DispatcherFrame      at System Windows Threading Dispatcher PushFrame        System Windows Threading DispatcherFrame      at System Windows Threading Dispatcher Run       at System Windows Application RunDispatcher System Object      at System Windows Application RunInternal System Windows Window      at System Windows Application Run System Windows Window      at The Application Name Main     BtnUseDesktop Click  private void BtnUseDesktop Click object sender  RoutedEventArgs e        AvSwitcher switcher   new AvSwitcher        this RunAsyncTask      gt           switcher SwitchToDesktop this windowSyncSvc ActiveLyncWindowHandle        The AvSwitcher that the Click Event Calls Into  public class AvSwitcher       private DeviceLocationSvc deviceLocationSvc      private UIAutomationSvc uiAutomationSvc      private WindowMovingSvc windowMovingSvc      private ManualResetEvent manualResetEvent      private Modality audioVideo      public static bool IsSwitching   get  set         public AvSwitcher                             this deviceLocationSvc   new DeviceLocationSvc            this uiAutomationSvc   new UIAutomationSvc            this windowMovingSvc   new WindowMovingSvc               public void SwitchToDesktop IntPtr activeLyncConvWindowHandle                this BeginHold DeviceLocation Desktop  activeLyncConvWindowHandle              public void SwitchToWall IntPtr activeLyncConvWindowHandle                this BeginHold DeviceLocation Wall  activeLyncConvWindowHandle              private Conversation GetLyncConversation                 Conversation conv   null          if  LyncClient GetClient      null                        conv   LyncClient GetClient   ConversationManager Conversations FirstOrDefault                       return conv             private void BeginHold DeviceLocation targetLocation  IntPtr activeLyncConvWindowHandle                AvSwitcher IsSwitching   true              make sure the class doesn t dispose of itself         this manualResetEvent   new ManualResetEvent false            Conversation conv   this GetLyncConversation            if  conv    null                        this audioVideo   conv Modalities ModalityTypes AudioVideo               ModalityState modalityState   this audioVideo State               if  modalityState    ModalityState Connected                                this HoldCallAndThenDoTheSwitching targetLocation  activeLyncConvWindowHandle                             else                               this DoTheSwitching targetLocation  activeLyncConvWindowHandle                                      private void HoldCallAndThenDoTheSwitching          DeviceLocation targetLocation           IntPtr activeLyncConvWindowHandle                try                       this audioVideo BeginHold                  this BeginHold callback                  new AsyncStateValues                                         TargetLocation   targetLocation                      ActiveLyncConvWindowHandle   activeLyncConvWindowHandle                                 this manualResetEvent WaitOne                      catch  UnauthorizedAccessException                           the call is already on hold             this DoTheSwitching targetLocation  activeLyncConvWindowHandle                        private void BeginHold callback IAsyncResult ar                if  ar IsCompleted                        DeviceLocation targetLocation     AsyncStateValues ar AsyncState  TargetLocation              IntPtr activeLyncConvWindowHandle                      AsyncStateValues ar AsyncState  ActiveLyncConvWindowHandle              this DoTheSwitching targetLocation  activeLyncConvWindowHandle                      Thread Sleep 2000      is this necessary         this audioVideo BeginRetrieve this BeginRetrieve callback  null              private void DoTheSwitching DeviceLocation targetLocation  IntPtr activeLyncConvWindowHandle                DeviceLocationSvc TargetDevices targetDevices                this deviceLocationSvc GetTargetDevices targetLocation            this SwitchScreenUsingWinApi targetDevices Screen  activeLyncConvWindowHandle           this SwitchVideoUsingLyncApi targetDevices VideoDevice           this SwitchAudioUsingUIAutomation              targetDevices MicName               targetDevices SpeakersName               activeLyncConvWindowHandle            AvSwitcher IsSwitching   false             private void SwitchScreenUsingWinApi Screen targetScreen  IntPtr activeLyncConvWindowHandle                if  activeLyncConvWindowHandle    IntPtr Zero                        WindowPosition wp                    this windowMovingSvc GetTargetWindowPositionFromScreen targetScreen               this windowMovingSvc MoveTheWindowToTargetPosition activeLyncConvWindowHandle  wp                        private void SwitchVideoUsingLyncApi VideoDevice targetVideoDevice                if  targetVideoDevice    null                        LyncClient GetClient   DeviceManager ActiveVideoDevice   targetVideoDevice                       private void SwitchAudioUsingUIAutomation          string targetMicName           string targetSpeakersName           IntPtr activeLyncConvWindowHandle                if  targetMicName    null  amp  amp  targetSpeakersName    null                        AutomationElement lyncConvWindow                    AutomationElement FromHandle activeLyncConvWindowHandle                AutomationElement lyncOptionsWindow                   this uiAutomationSvc OpenTheLyncOptionsWindowFromTheConvWindow lyncConvWindow                this uiAutomationSvc SelectTheTargetMic lyncOptionsWindow  targetMicName                this uiAutomationSvc SelectTheTargetSpeakers lyncOptionsWindow  targetSpeakersName                this uiAutomationSvc InvokeOkayButton lyncOptionsWindow                        private void BeginRetrieve callback IAsyncResult ar                this audioVideo EndRetrieve ar           this manualResetEvent Set       allow the program to exit            private class AsyncStateValues               internal DeviceLocation TargetLocation   get  set             internal IntPtr ActiveLyncConvWindowHandle   get  set

User · Answer

I came across a similar situation after publishing a ClickOnce application, and one of my colleagues on a different domain reported that it fails to launch.

To find out what was going on, I added a try catch statement inside the MainWindow method as @BradleyDotNET mentioned in one comment on the original post, and then published again.

public MainWindow()
{
    try
    {
        InitializeComponent();
    }
    catch (Exception exc)
    {
        MessageBox.Show(exc.ToString());
    }
}

Then my colleague reported to me the exception detail, and it was a missing reference of a third party framework dll file.

Added the reference and problem solved.

User · Answer

I ve been mislead by this error more than once  After spending hours googling  updating nuget packages  version checking  then after sitting with a completely updated solution I re-realize a perfectly valid  simpler reason for the error   If in a threaded enthronement  UI Dispatcher Invoke for example   System IO FileNotFoundException is thrown if the thread manager dll  file  fails to return  So if your main UI thread A  calls the system thread manager dll B  and B calls your thread code C  but C throws for some unrelated reason  such as null Reference as in my case   then C does not return  B does not return  and A only blames B with FileNotFoundException for being lost     Before going down the dll version path    Check closer to home and verify your thread code is not throwing

User · Answer

I hate to point out the obvious  but System IO FileNotFoundException means the program did not find the file you specified  So what you need to do is check what file your code is looking for in production    To see what file your program is looking for in production  look at the FileName property of the exception   try these techniques    write to a debug log   use Visual Studio Attach to Process  or use Visual Studio Remote Debugging    Then look at the file system on the machine and see if the file exists  Most likely the case is that it doesn t exist

User · Answer

Check all the references carefully   Version remains same on target machine and local machine If assembly is referenced from GAC  ensure that proper version is loaded      For me cleaning entire solution by deleting manually  updating  removing and adding  references again with version in sync with target machine and then building with with Copy Local   False for GAC assemblies solves the problem

[c#] How to resolve this System.IO.FileNotFoundException

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