Событие изменения файла вызывается дважды
Я использую комбинацию IVsFileChangeEvents а также IVsFileChangeEx контролировать, был ли файл, отредактированный в моем пользовательском расширении редактора, изменен за пределами IDE. Однако по какой-то неизвестной причине я получаю уведомление дважды, что приводит к тому, что пользователь дважды запрашивает перезагрузку.
Реализация FilesChanged выглядит следующим образом:
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;
}
Я тестирую этот код, сохраняя тот же файл в Notepad++.
Это журнал из ProcMon от 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
Похоже, что вызов MessageBox.Show является основной причиной второго уведомления.
Стек вызовов выглядит следующим образом:
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#
Что я должен сделать, чтобы получить событие только один раз?
3 ответа
Я заставил это работать, отсоединив уведомления в методе и повторно прикрепляя их в конце.
Выглядит примерно так (обратите внимание, что я опустил некоторые детали относительноserviceProvider, fileChangeCookie, filesChangedМассив, ...)
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);
}
У меня были похожие проблемы с событиями изменения файла уровня Win32. Есть много вещей, которые вы можете сделать, чтобы уменьшить проблемы (например, отключение событий). В действительности вы не представляете, сколько раз файл мог "изменяться" во время обработки события. Для событий на основе сообщений все, что требуется, - это вызов всего, что обрабатывает сообщения для повторного ввода, для многопоточных событий вам даже не нужно вызывать что-то - это может произойти независимо от того, что вы делаете. В результате вы должны быть очень осторожны с тем, что вы делаете, когда получаете уведомление. В идеале ваш обработчик событий должен быть написан так, чтобы он мог обрабатывать вызовы снова, пока он еще обрабатывает предыдущее событие. В зависимости от того, что делает диалог и последующая обработка, вы можете просто отслеживать, открыт ли он и / или обрабатывать и / или игнорировать какие-либо параллельные события, или вам может потребоваться уведомить диалог или код обработки о том, что другое изменение имеет произошло. Отключение и повторное подключение уведомлений работает для событий, основанных на сообщениях, но не при наличии каких-либо потоков.
Показывая окно сообщения, вы фактически создаете новый цикл обработки сообщений, в котором возможен повторный вход. Это в сочетании с тем, что FilesChanged событие не закончилось с точки зрения VS (вы еще не вернулись из своей функции), что может привести к странным действиям.
Вернитесь немедленно в ваш обработчик. Поставить в очередь MessageBox и перезагрузить документ, используя ThreadHelper.Generic.BeginInvoke,