The event with the modified file is called twice

Question

The event with the modified file is called twice

I use a combination of IVsFileChangeEvents and IVsFileChangeEx to monitor whether a file modified in my custom editor extension has been modified outside of the IDE. However, for some unknown reason, I get a notification twice, which causes the user to reboot twice.

The implementation of FilesChanged is as follows:

  public int FilesChanged(uint cChanges, string[] rgpszFile, uint[] rggrfChange) { foreach (var file in rgpszFile) { if (file.ToLowerInvariant() == documentPath.ToLowerInvariant()) { System.Diagnostics.Debug.WriteLine("File changed - asking for reload"); if (MessageBox.Show("The file {0} was changed outside the editor. Do you want to reload it?".FillWith(file), "MyEditor", MessageBoxButton.YesNo, MessageBoxImage.Question) == MessageBoxResult.Yes) { fileChangeEx.IgnoreFile(fileCookie, null, 1); // Unloading document DoCloseDocument(); // Loading document DoLoadDocument(file); fileChangeEx.SyncFile(documentPath); fileChangeEx.IgnoreFile(fileCookie, null, 0); } } } return VSConstants.S_OK; }

I am testing this code by saving the same file in Notepad ++.

This is the log from ProcMon SysInternals:

 09:05:21,2272369 notepad++.exe 256 QueryOpen D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS CreationTime: 2014-05-21 13:08:34, LastAccessTime: 2014-05-21 13:08:34, LastWriteTime: 2014-05-23 08:50:27, ChangeTime: 2014-05-23 08:50:27, AllocationSize: 4 096, EndOfFile: 1 740, FileAttributes: A 09:05:21,2273658 notepad++.exe 256 QueryOpen D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS CreationTime: 2014-05-21 13:08:34, LastAccessTime: 2014-05-21 13:08:34, LastWriteTime: 2014-05-23 08:50:27, ChangeTime: 2014-05-23 08:50:27, AllocationSize: 4 096, EndOfFile: 1 740, FileAttributes: A 09:05:21,2275512 notepad++.exe 256 QueryDirectory D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS Filter: settings.definition, 1: settings.definition 09:05:28,7692878 notepad++.exe 256 QueryOpen D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS CreationTime: 2014-05-21 13:08:34, LastAccessTime: 2014-05-21 13:08:34, LastWriteTime: 2014-05-23 08:50:27, ChangeTime: 2014-05-23 08:50:27, AllocationSize: 4 096, EndOfFile: 1 740, FileAttributes: A 09:05:28,7694244 notepad++.exe 256 QueryOpen D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS CreationTime: 2014-05-21 13:08:34, LastAccessTime: 2014-05-21 13:08:34, LastWriteTime: 2014-05-23 08:50:27, ChangeTime: 2014-05-23 08:50:27, AllocationSize: 4 096, EndOfFile: 1 740, FileAttributes: A 09:05:28,7696066 notepad++.exe 256 QueryDirectory D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS Filter: settings.definition, 1: settings.definition 09:05:44,0463636 notepad++.exe 256 QueryOpen D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS CreationTime: 2014-05-21 13:08:34, LastAccessTime: 2014-05-21 13:08:34, LastWriteTime: 2014-05-23 08:50:27, ChangeTime: 2014-05-23 08:50:27, AllocationSize: 4 096, EndOfFile: 1 740, FileAttributes: A 09:05:46,4087520 notepad++.exe 256 QueryOpen D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS CreationTime: 2014-05-21 13:08:34, LastAccessTime: 2014-05-21 13:08:34, LastWriteTime: 2014-05-23 08:50:27, ChangeTime: 2014-05-23 08:50:27, AllocationSize: 4 096, EndOfFile: 1 740, FileAttributes: A 09:05:46,4088700 notepad++.exe 256 QueryOpen D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS CreationTime: 2014-05-21 13:08:34, LastAccessTime: 2014-05-21 13:08:34, LastWriteTime: 2014-05-23 08:50:27, ChangeTime: 2014-05-23 08:50:27, AllocationSize: 4 096, EndOfFile: 1 740, FileAttributes: A 09:05:46,4089646 notepad++.exe 256 QueryOpen D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS CreationTime: 2014-05-21 13:08:34, LastAccessTime: 2014-05-21 13:08:34, LastWriteTime: 2014-05-23 08:50:27, ChangeTime: 2014-05-23 08:50:27, AllocationSize: 4 096, EndOfFile: 1 740, FileAttributes: A 09:05:46,4090631 notepad++.exe 256 CreateFile D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS Desired Access: Generic Write, Read Attributes, Dis, Options: Synchronous IO Non-Alert, Non-Directory File, Attributes: N, ShareMode: Read, Write, AllocationSize: 0, OpenResult: Overwritten 09:05:46,4100654 notepad++.exe 256 WriteFile D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS Offset: 0, Length: 1 742, Priority: Normal 09:05:46,4101850 notepad++.exe 256 CloseFile D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS 09:05:46,4102751 devenv.exe 6884 QueryOpen D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS CreationTime: 2014-05-21 13:08:34, LastAccessTime: 2014-05-21 13:08:34, LastWriteTime: 2014-05-23 09:05:46, ChangeTime: 2014-05-23 09:05:46, AllocationSize: 4 096, EndOfFile: 1 742, FileAttributes: A 09:05:46,4103088 MsMpEng.exe 956 CreateFileMapping D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition FILE LOCKED WITH WRITERS SyncType: SyncTypeCreateSection, PageProtection: 09:05:46,4103322 MsMpEng.exe 956 QueryStandardInformationFile D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS AllocationSize: 4 096, EndOfFile: 1 742, NumberOfLinks: 1, DeletePending: False, Directory: False 09:05:46,4144664 notepad++.exe 256 QueryDirectory D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS Filter: settings.definition, 1: settings.definition 09:05:46,4160238 notepad++.exe 256 QueryOpen D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS CreationTime: 2014-05-21 13:08:34, LastAccessTime: 2014-05-21 13:08:34, LastWriteTime: 2014-05-23 09:05:46, ChangeTime: 2014-05-23 09:05:46, AllocationSize: 4 096, EndOfFile: 1 742, FileAttributes: A 09:05:46,4172362 notepad++.exe 256 QueryOpen D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS CreationTime: 2014-05-21 13:08:34, LastAccessTime: 2014-05-21 13:08:34, LastWriteTime: 2014-05-23 09:05:46, ChangeTime: 2014-05-23 09:05:46, AllocationSize: 4 096, EndOfFile: 1 742, FileAttributes: A 09:05:46,4173472 notepad++.exe 256 QueryOpen D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS CreationTime: 2014-05-21 13:08:34, LastAccessTime: 2014-05-21 13:08:34, LastWriteTime: 2014-05-23 09:05:46, ChangeTime: 2014-05-23 09:05:46, AllocationSize: 4 096, EndOfFile: 1 742, FileAttributes: A 09:05:46,4175063 notepad++.exe 256 QueryDirectory D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS Filter: settings.definition, 1: settings.definition 09:05:46,4178437 notepad++.exe 256 QueryOpen D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS CreationTime: 2014-05-21 13:08:34, LastAccessTime: 2014-05-21 13:08:34, LastWriteTime: 2014-05-23 09:05:46, ChangeTime: 2014-05-23 09:05:46, AllocationSize: 4 096, EndOfFile: 1 742, FileAttributes: A 09:05:46,4185672 notepad++.exe 256 QueryOpen D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS CreationTime: 2014-05-21 13:08:34, LastAccessTime: 2014-05-21 13:08:34, LastWriteTime: 2014-05-23 09:05:46, ChangeTime: 2014-05-23 09:05:46, AllocationSize: 4 096, EndOfFile: 1 742, FileAttributes: A 09:05:46,4186404 devenv.exe 6884 QueryOpen D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS CreationTime: 2014-05-21 13:08:34, LastAccessTime: 2014-05-21 13:08:34, LastWriteTime: 2014-05-23 09:05:46, ChangeTime: 2014-05-23 09:05:46, AllocationSize: 4 096, EndOfFile: 1 742, FileAttributes: A 09:06:06,8788282 notepad++.exe 256 QueryOpen D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS CreationTime: 2014-05-21 13:08:34, LastAccessTime: 2014-05-21 13:08:34, LastWriteTime: 2014-05-23 09:05:46, ChangeTime: 2014-05-23 09:05:46, AllocationSize: 4 096, EndOfFile: 1 742, FileAttributes: A 09:06:06,8789555 notepad++.exe 256 QueryOpen D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS CreationTime: 2014-05-21 13:08:34, LastAccessTime: 2014-05-21 13:08:34, LastWriteTime: 2014-05-23 09:05:46, ChangeTime: 2014-05-23 09:05:46, AllocationSize: 4 096, EndOfFile: 1 742, FileAttributes: A 09:06:06,8791373 notepad++.exe 256 QueryDirectory D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS Filter: settings.definition, 1: settings.definition 09:06:50,6465883 devenv.exe 6884 CreateFile D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS Desired Access: Generic Read, Dis, Options: Synchronous IO Non-Alert, Non-Directory File, Open No Recall, Attributes: n/a, ShareMode: Read, AllocationSize: n/a, OpenResult: Opened 09:06:50,6466482 devenv.exe 6884 QueryStandardInformationFile D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS AllocationSize: 4 096, EndOfFile: 1 742, NumberOfLinks: 1, DeletePending: False, Directory: False 09:06:50,6466665 devenv.exe 6884 ReadFile D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS Offset: 0, Length: 1 742, Priority: Normal 09:06:50,6467374 devenv.exe 6884 ReadFile D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition END OF FILE Offset: 1 742, Length: 4 096 09:06:50,6469314 devenv.exe 6884 CloseFile D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS 09:06:50,6477175 devenv.exe 6884 QueryOpen D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS CreationTime: 2014-05-21 13:08:34, LastAccessTime: 2014-05-21 13:08:34, LastWriteTime: 2014-05-23 09:05:46, ChangeTime: 2014-05-23 09:05:46, AllocationSize: 4 096, EndOfFile: 1 742, FileAttributes: A 09:06:50,6963339 devenv.exe 6884 QueryOpen D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS CreationTime: 2014-05-21 13:08:34, LastAccessTime: 2014-05-21 13:08:34, LastWriteTime: 2014-05-23 09:05:46, ChangeTime: 2014-05-23 09:05:46, AllocationSize: 4 096, EndOfFile: 1 742, FileAttributes: A 09:07:02,3340501 devenv.exe 6884 CreateFile D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS Desired Access: Generic Read, Dis, Options: Synchronous IO Non-Alert, Non-Directory File, Open No Recall, Attributes: n/a, ShareMode: Read, AllocationSize: n/a, OpenResult: Opened 09:07:02,3341050 devenv.exe 6884 QueryStandardInformationFile D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS AllocationSize: 4 096, EndOfFile: 1 742, NumberOfLinks: 1, DeletePending: False, Directory: False 09:07:02,3341200 devenv.exe 6884 ReadFile D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS Offset: 0, Length: 1 742, Priority: Normal 09:07:02,3341887 devenv.exe 6884 ReadFile D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition END OF FILE Offset: 1 742, Length: 4 096 09:07:02,3343792 devenv.exe 6884 CloseFile D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS 09:07:02,3351733 devenv.exe 6884 QueryOpen D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS CreationTime: 2014-05-21 13:08:34, LastAccessTime: 2014-05-21 13:08:34, LastWriteTime: 2014-05-23 09:05:46, ChangeTime: 2014-05-23 09:05:46, AllocationSize: 4 096, EndOfFile: 1 742, FileAttributes: A 09:07:02,3626280 devenv.exe 6884 QueryOpen D:\VS Projects\Temporary\WindowsFormsApplication1\WindowsFormsApplication1\NewFolder1\settings.definition SUCCESS CreationTime: 2014-05-21 13:08:34, LastAccessTime: 2014-05-21 13:08:34, LastWriteTime: 2014-05-23 09:05:46, ChangeTime: 2014-05-23 09:05:46, AllocationSize: 4 096, EndOfFile: 1 742, FileAttributes: A

It seems that calling MessageBox.Show is the main reason for the second notification.

The call stack is as follows:

 MyAssembly.dll!MyClass.FilesChanged(uint cChanges = 1, string[] rgpszFile = {string[1]}, uint[] rggrfChange = {uint[1]}) Line 284 C# Microsoft.VisualStudio.Shell.UI.Internal.dll!Microsoft.VisualStudio.Services.FileChangeSubscription.Notify.AnonymousMethod__0() Unknown Microsoft.VisualStudio.Shell.12.0.dll!Microsoft.VisualStudio.ErrorHandler.CallWithCOMConvention(System.Func<int> method, bool reportError = false, bool setShellErrorInfo = true) Unknown Microsoft.VisualStudio.Shell.UI.Internal.dll!Microsoft.VisualStudio.Services.FileChangeSubscription.Notify(Microsoft.VisualStudio.Shell.Interop._VSFILECHANGEFLAGS changes) Unknown Microsoft.VisualStudio.Shell.UI.Internal.dll!Microsoft.VisualStudio.Services.FileChangeSubscription.Notify(System.IO.WatcherChangeTypes changeTypes, Microsoft.VisualStudio.Services.FileProperties props) Unknown Microsoft.VisualStudio.Shell.UI.Internal.dll!Microsoft.VisualStudio.Services.FileWatcher.Notify(Microsoft.VisualStudio.Services.ChangeStreamDigest digest) Unknown Microsoft.VisualStudio.Shell.UI.Internal.dll!Microsoft.VisualStudio.Services.DirectoryWatcher.ProcessFileChanges(System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<string,Microsoft.VisualStudio.Services.ChangeStreamDigest>> digests, int depth) Unknown Microsoft.VisualStudio.Shell.UI.Internal.dll!Microsoft.VisualStudio.Services.DirectoryWatcher.ProcessChanges(System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<string,Microsoft.VisualStudio.Services.ChangeStreamDigest>> digests = Count = 1, int depth = 3) Unknown Microsoft.VisualStudio.Shell.UI.Internal.dll!Microsoft.VisualStudio.Services.DirectoryWatcher.ProcessChanges(System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<string,Microsoft.VisualStudio.Services.ChangeStreamDigest>> digests = Count = 1, int depth = 2) Unknown Microsoft.VisualStudio.Shell.UI.Internal.dll!Microsoft.VisualStudio.Services.DirectoryWatcher.ProcessChanges(System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<string,Microsoft.VisualStudio.Services.ChangeStreamDigest>> digests = {Microsoft.Internal.VisualStudio.PlatformUI.HybridDictionary<string,Microsoft.VisualStudio.Services.ChangeStreamDigest>}, int depth = 1) Unknown Microsoft.VisualStudio.Shell.UI.Internal.dll!Microsoft.VisualStudio.Services.DirectoryWatcher.OnChangedAsync() Unknown WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate callback, object args, int numArgs) Unknown WindowsBase.dll!MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(object source = {System.Windows.Threading.Dispatcher}, System.Delegate method, object args, int numArgs, System.Delegate catchHandler = null) Unknown WindowsBase.dll!System.Windows.Threading.DispatcherOperation.InvokeImpl() Unknown WindowsBase.dll!System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(object state) Unknown mscorlib.dll!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx) Unknown mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx) Unknown mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state) Unknown WindowsBase.dll!System.Windows.Threading.DispatcherOperation.Invoke() Unknown WindowsBase.dll!System.Windows.Threading.Dispatcher.ProcessQueue() Unknown WindowsBase.dll!System.Windows.Threading.Dispatcher.WndProcHook(System.IntPtr hwnd, int msg, System.IntPtr wParam, System.IntPtr lParam, ref bool handled) Unknown WindowsBase.dll!MS.Win32.HwndWrapper.WndProc(System.IntPtr hwnd = 264738, int msg = 49778, System.IntPtr wParam = 0, System.IntPtr lParam = 0, ref bool handled = false) Unknown WindowsBase.dll!MS.Win32.HwndSubclass.DispatcherCallbackOperation(object o) Unknown WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate callback, object args, int numArgs) Unknown WindowsBase.dll!MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(object source = {System.Windows.Threading.Dispatcher}, System.Delegate method, object args, int numArgs, System.Delegate catchHandler = null) Unknown WindowsBase.dll!System.Windows.Threading.Dispatcher.LegacyInvokeImpl(System.Windows.Threading.DispatcherPriority priority, System.TimeSpan timeout, System.Delegate method, object args, int numArgs) Unknown WindowsBase.dll!MS.Win32.HwndSubclass.SubclassWndProc(System.IntPtr hwnd = 264738, int msg = 49778, System.IntPtr wParam = 0, System.IntPtr lParam = 0) Unknown [Native to Managed Transition] [Managed to Native Transition] PresentationFramework.dll!System.Windows.MessageBox.ShowCore(System.IntPtr owner, string messageBoxText, string caption, System.Windows.MessageBoxButton button, System.Windows.MessageBoxImage icon, System.Windows.MessageBoxResult defaultResult, System.Windows.MessageBoxOptions options) Unknown PresentationFramework.dll!System.Windows.MessageBox.Show(string messageBoxText, string caption, System.Windows.MessageBoxButton button, System.Windows.MessageBoxImage icon) Unknown MyAssembly.dll!MyClass.FilesChanged(uint cChanges = 1, string[] rgpszFile = {string[1]}, uint[] rggrfChange = {uint[1]}) Line 290 C#

What to do to receive an event only once?

+6

c # vs-extensibility

Spook May 23 '14 at 9:32

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3 answers

Alexander Pacha · Answer 1 · 2014-05-28T14:18:21+0000

I got it to work, separating the notifications in the method and returning them to the end.

It looks something like this (note that I skipped some details regarding serviceProvider , fileChangeCookie , filesChanged -array, ...)

 int IVsFileChangeEvents.FilesChanged(uint numberOfFilesChanged, string[] filesChanged, uint[] flags) { IVsFileChangeEx fileChangeService = yourServiceProvider.GetService(typeof(SVsFileChangeEx)); // Detach from notifications fileChangeService.UnadviseFileChange(GetCookieFromFile(filesChanged[0])); // Do your stuff with the file ... // Re-attach to notifications fileChangeService.AdviseFileChange(filesChanged[0], (uint)(_VSFILECHANGEFLAGS.VSFILECHG_Time | _VSFILECHANGEFLAGS.VSFILECHG_Del), this, out fileChangeCookie); }

James · Answer 2 · 2014-11-06T23:39:35+0000

I had similar problems with files with a modified file at the Win32 level. There are many things you can do to reduce problems (for example, disable events). In fact, you can’t imagine how many times the file could “change” during the processing of the event. For events related to messages, all that is required is to call everything that processes the messages for re-entry, for multi-threaded events you do not even need to call something - this can happen no matter what you do. As a result, you must be very careful about what you do when you receive a notification. Ideally, your event handler should be written so that it can handle the call again while it is still processing the previous event. Depending on what the dialog does and the subsequent processing, you can simply keep track of whether it is open and / or any parallel events are being processed and ignored, or you may need to notify a dialog box or processing code has occurred. Disabling and reconnecting notifications works for message-based events, but not if there is any streaming.

Julien Lebosquain · Answer 3 · 2014-05-23T10:08:19+0000

By showing the message box, you effectively create a new message loop that allows you to potentially re-enter data. This, combined with the fact that the FilesChanged event FilesChanged not finished working from the point of view of VS (you have not returned from your function), can lead to strange behavior.

Return to your handler immediately. Queue in a MessageBox and reload a document using ThreadHelper.Generic.BeginInvoke .

The event with the modified file is called twice

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