/// <summary>A synchronous method that returns a structure that contains specific information on the change that occurred, given the type of change you want to monitor and the time (in milliseconds) to wait before timing out.</summary>
/// <returns>A <see cref="T:System.IO.WaitForChangedResult" /> that contains specific information on the change that occurred.</returns>
/// <param name="changeType">The <see cref="T:System.IO.WatcherChangeTypes" /> to watch for. </param>
/// <param name="timeout">The time (in milliseconds) to wait before timing out. </param>
/// <filterpriority>2</filterpriority>
public WaitForChangedResult WaitForChanged(WatcherChangeTypes changeType, int timeout)
{
WaitForChangedResult result = default(WaitForChangedResult);
bool flag = EnableRaisingEvents;
if (!flag)
{
EnableRaisingEvents = true;
}
bool flag2;
lock (this)
{
waiting = true;
flag2 = Monitor.Wait(this, timeout);
if (flag2)
{
result = lastData;
}
}
EnableRaisingEvents = flag;
if (!flag2)
{
result.TimedOut = true;
}
return(result);
}
public WaitForChangedResult WaitForChanged(WatcherChangeTypes changeType, int timeout)
{
WaitForChangedResult result = new WaitForChangedResult();
bool prevEnabled = EnableRaisingEvents;
if (!prevEnabled)
{
EnableRaisingEvents = true;
}
bool gotData;
lock (this) {
waiting = true;
gotData = Monitor.Wait(this, timeout);
if (gotData)
{
result = this.lastData;
}
}
EnableRaisingEvents = prevEnabled;
if (!gotData)
{
result.TimedOut = true;
}
return(result);
}
internal void DispatchEvents(FileAction act, string filename, ref RenamedEventArgs renamed)
{
if (disposed)
{
return;
}
if (waiting)
{
lastData = new WaitForChangedResult();
}
switch (act)
{
case FileAction.Added:
lastData.Name = filename;
lastData.ChangeType = WatcherChangeTypes.Created;
Task.Run(() => OnCreated(new FileSystemEventArgs(WatcherChangeTypes.Created, path, filename)));
break;
case FileAction.Removed:
lastData.Name = filename;
lastData.ChangeType = WatcherChangeTypes.Deleted;
Task.Run(() => OnDeleted(new FileSystemEventArgs(WatcherChangeTypes.Deleted, path, filename)));
break;
case FileAction.Modified:
lastData.Name = filename;
lastData.ChangeType = WatcherChangeTypes.Changed;
Task.Run(() => OnChanged(new FileSystemEventArgs(WatcherChangeTypes.Changed, path, filename)));
break;
case FileAction.RenamedOldName:
if (renamed != null)
{
OnRenamed(renamed);
}
lastData.OldName = filename;
lastData.ChangeType = WatcherChangeTypes.Renamed;
renamed = new RenamedEventArgs(WatcherChangeTypes.Renamed, path, filename, "");
break;
case FileAction.RenamedNewName:
lastData.Name = filename;
lastData.ChangeType = WatcherChangeTypes.Renamed;
if (renamed == null)
{
renamed = new RenamedEventArgs(WatcherChangeTypes.Renamed, path, "", filename);
}
var renamed_ref = renamed;
Task.Run(() => OnRenamed(renamed_ref));
renamed = null;
break;
default:
break;
}
}
/// <devdoc>
/// Internal method used for synchronous notification.
/// </devdoc>
/// <internalonly/>
private void OnInternalFileSystemEventArgs(object sender, FileSystemEventArgs e)
{
lock (this) {
// Only change the state of the changed result if it doesn't contain a previous one.
if (isChanged != true)
{
changedResult = new WaitForChangedResult(e.ChangeType, e.Name, false);
isChanged = true;
System.Threading.Monitor.Pulse(this);
}
}
}
private void OnInternalRenameEventArgs(object sender, RenamedEventArgs e)
{
lock (this)
{
if (!this.isChanged)
{
this.changedResult = new WaitForChangedResult(e.ChangeType, e.Name, e.OldName, false);
this.isChanged = true;
System.Threading.Monitor.Pulse(this);
}
}
}
internal void DispatchEvents(FileAction act, string filename, ref RenamedEventArgs renamed)
{
if (waiting)
{
lastData = default(WaitForChangedResult);
}
switch (act)
{
case FileAction.Added:
lastData.Name = filename;
lastData.ChangeType = WatcherChangeTypes.Created;
OnCreated(new FileSystemEventArgs(WatcherChangeTypes.Created, path, filename));
break;
case FileAction.Removed:
lastData.Name = filename;
lastData.ChangeType = WatcherChangeTypes.Deleted;
OnDeleted(new FileSystemEventArgs(WatcherChangeTypes.Deleted, path, filename));
break;
case FileAction.Modified:
lastData.Name = filename;
lastData.ChangeType = WatcherChangeTypes.Changed;
OnChanged(new FileSystemEventArgs(WatcherChangeTypes.Changed, path, filename));
break;
case FileAction.RenamedOldName:
if (renamed != null)
{
OnRenamed(renamed);
}
lastData.OldName = filename;
lastData.ChangeType = WatcherChangeTypes.Renamed;
renamed = new RenamedEventArgs(WatcherChangeTypes.Renamed, path, filename, string.Empty);
break;
case FileAction.RenamedNewName:
lastData.Name = filename;
lastData.ChangeType = WatcherChangeTypes.Renamed;
if (renamed == null)
{
renamed = new RenamedEventArgs(WatcherChangeTypes.Renamed, path, string.Empty, filename);
}
OnRenamed(renamed);
renamed = null;
break;
}
}
WaitForChangedResult waitForChangedHandler(string directoryPath, string filter,
WatcherChangeTypes watcherChangeTypes, int timeOut) {
if (watcherChangeTypes != WatcherChangeTypes.Created)
throw new NotImplementedException(watcherChangeTypes.ToString());
var filesList = new ArrayList(Directory.GetFiles(directoryPath, filter));
var waitForChangedResult = new WaitForChangedResult();
while (true) {
var newFilesList = new ArrayList(Directory.GetFiles(directoryPath, filter));
foreach (string file in newFilesList) {
if (!filesList.Contains(file)) {
waitForChangedResult.ChangeType = WatcherChangeTypes.Created;
waitForChangedResult.Name = file;
return waitForChangedResult;
}
}
}
}
static WaitForChangedResult()
{
TimedOutResult = new WaitForChangedResult(0, null, true);
}
internal void DispatchEvents (FileAction act, string filename, ref RenamedEventArgs renamed)
{
if (waiting) {
lastData = new WaitForChangedResult ();
}
switch (act) {
case FileAction.Added:
lastData.Name = filename;
lastData.ChangeType = WatcherChangeTypes.Created;
OnCreated (new FileSystemEventArgs (WatcherChangeTypes.Created, path, filename));
break;
case FileAction.Removed:
lastData.Name = filename;
lastData.ChangeType = WatcherChangeTypes.Deleted;
OnDeleted (new FileSystemEventArgs (WatcherChangeTypes.Deleted, path, filename));
break;
case FileAction.Modified:
lastData.Name = filename;
lastData.ChangeType = WatcherChangeTypes.Changed;
OnChanged (new FileSystemEventArgs (WatcherChangeTypes.Changed, path, filename));
break;
case FileAction.RenamedOldName:
if (renamed != null) {
OnRenamed (renamed);
}
lastData.OldName = filename;
lastData.ChangeType = WatcherChangeTypes.Renamed;
renamed = new RenamedEventArgs (WatcherChangeTypes.Renamed, path, filename, "");
break;
case FileAction.RenamedNewName:
lastData.Name = filename;
lastData.ChangeType = WatcherChangeTypes.Renamed;
if (renamed == null) {
renamed = new RenamedEventArgs (WatcherChangeTypes.Renamed, path, "", filename);
}
OnRenamed (renamed);
renamed = null;
break;
default:
break;
}
}
public WaitForChangedResult WaitForChanged (WatcherChangeTypes changeType, int timeout)
{
WaitForChangedResult result = new WaitForChangedResult ();
bool prevEnabled = EnableRaisingEvents;
if (!prevEnabled)
EnableRaisingEvents = true;
bool gotData;
lock (this) {
waiting = true;
gotData = Monitor.Wait (this, timeout);
if (gotData)
result = this.lastData;
}
EnableRaisingEvents = prevEnabled;
if (!gotData)
result.TimedOut = true;
return result;
}
/// <devdoc>
/// <para>
/// A synchronous
/// method that returns a structure that contains specific information on the change that occurred, given the
/// type of change that you wish to monitor and the time (in milliseconds) to wait before timing out.
/// </para>
/// </devdoc>
public WaitForChangedResult WaitForChanged(WatcherChangeTypes changeType, int timeout)
{
FileSystemEventHandler dirHandler = new FileSystemEventHandler(this.OnInternalFileSystemEventArgs);
RenamedEventHandler renameHandler = new RenamedEventHandler(this.OnInternalRenameEventArgs);
this.isChanged = false;
this.changedResult = WaitForChangedResult.TimedOutResult;
// Register the internal event handler from the given change types.
if ((changeType & WatcherChangeTypes.Created) != 0)
{
this.Created += dirHandler;
}
if ((changeType & WatcherChangeTypes.Deleted) != 0)
{
this.Deleted += dirHandler;
}
if ((changeType & WatcherChangeTypes.Changed) != 0)
{
this.Changed += dirHandler;
}
if ((changeType & WatcherChangeTypes.Renamed) != 0)
{
this.Renamed += renameHandler;
}
// Save the Enabled state of this component to revert back to it later (if needed).
bool savedEnabled = EnableRaisingEvents;
if (savedEnabled == false)
{
runOnce = true;
EnableRaisingEvents = true;
}
// For each thread entering this wait loop, addref it and wait. When the last one
// exits, reset the waiterObject.
WaitForChangedResult retVal = WaitForChangedResult.TimedOutResult;
lock (this) {
if (timeout == -1)
{
while (!isChanged)
{
System.Threading.Monitor.Wait(this);
}
}
else
{
System.Threading.Monitor.Wait(this, timeout, true);
}
retVal = changedResult;
}
// Revert the Enabled flag to its previous state.
EnableRaisingEvents = savedEnabled;
runOnce = false;
// Decouple the event handlers added above.
if ((changeType & WatcherChangeTypes.Created) != 0)
{
this.Created -= dirHandler;
}
if ((changeType & WatcherChangeTypes.Deleted) != 0)
{
this.Deleted -= dirHandler;
}
if ((changeType & WatcherChangeTypes.Changed) != 0)
{
this.Changed -= dirHandler;
}
if ((changeType & WatcherChangeTypes.Renamed) != 0)
{
this.Renamed -= renameHandler;
}
// Return the struct.
return(retVal);
}
/// <devdoc>
/// Internal method used for synchronous notification.
/// </devdoc>
/// <internalonly/>
private void OnInternalRenameEventArgs(object sender, RenamedEventArgs e) {
lock (this) {
// Only change the state of the changed result if it doesn't contain a previous one.
if (isChanged != true) {
changedResult = new WaitForChangedResult(e.ChangeType, e.Name, e.OldName, false);
isChanged = true;
System.Threading.Monitor.Pulse(this);
}
}
}
/// <devdoc>
/// <para>
/// A synchronous
/// method that returns a structure that contains specific information on the change that occurred, given the
/// type of change that you wish to monitor and the time (in milliseconds) to wait before timing out.
/// </para>
/// </devdoc>
public WaitForChangedResult WaitForChanged(WatcherChangeTypes changeType, int timeout) {
FileSystemEventHandler dirHandler = new FileSystemEventHandler(this.OnInternalFileSystemEventArgs);
RenamedEventHandler renameHandler = new RenamedEventHandler(this.OnInternalRenameEventArgs);
this.isChanged = false;
this.changedResult = WaitForChangedResult.TimedOutResult;
// Register the internal event handler from the given change types.
if ((changeType & WatcherChangeTypes.Created) != 0) {
this.Created += dirHandler;
}
if ((changeType & WatcherChangeTypes.Deleted) != 0) {
this.Deleted += dirHandler;
}
if ((changeType & WatcherChangeTypes.Changed) != 0) {
this.Changed += dirHandler;
}
if ((changeType & WatcherChangeTypes.Renamed) != 0) {
this.Renamed += renameHandler;
}
// Save the Enabled state of this component to revert back to it later (if needed).
bool savedEnabled = EnableRaisingEvents;
if (savedEnabled == false) {
runOnce = true;
EnableRaisingEvents = true;
}
// For each thread entering this wait loop, addref it and wait. When the last one
// exits, reset the waiterObject.
WaitForChangedResult retVal = WaitForChangedResult.TimedOutResult;
lock (this) {
if (timeout == -1) {
while (!isChanged) {
System.Threading.Monitor.Wait(this);
}
}
else {
System.Threading.Monitor.Wait(this, timeout, true);
}
retVal = changedResult;
}
// Revert the Enabled flag to its previous state.
EnableRaisingEvents = savedEnabled;
runOnce = false;
// Decouple the event handlers added above.
if ((changeType & WatcherChangeTypes.Created) != 0) {
this.Created -= dirHandler;
}
if ((changeType & WatcherChangeTypes.Deleted) != 0) {
this.Deleted -= dirHandler;
}
if ((changeType & WatcherChangeTypes.Changed) != 0) {
this.Changed -= dirHandler;
}
if ((changeType & WatcherChangeTypes.Renamed) != 0) {
this.Renamed -= renameHandler;
}
// Return the struct.
return retVal;
}
private void SignalFileChangeForWaiters(WatcherChangeTypes type, string filePath)
{
if (_waiters == 0) return; // No point signaling if no one is waiting
// Getting the 'relative path' of the filePath compared to the currently monitored folder path
string uppercaseFilePath = filePath.ToUpperInvariant();
var fileNameToReport = uppercaseFilePath.Replace(_uppercasePath, string.Empty);
lock (_latestChangeLocker)
{
_latestChange = new WaitForChangedResult() { ChangeType = type, Name = fileNameToReport };
}
_changesWatchingEvent.Set();
}
public FileSystemPoller(int pollingInterval)
{
_path = String.Empty;
_initialFilesSeen = new ManualResetEvent(false);
_lastSeenFiles = new HashSet<string>();
_lastSeenDirs = new HashSet<string>();
Filter = string.Empty;
_waiters = 0;
_changesWatchingEvent = new AutoResetEvent(false);
_latestChangeLocker = new object();
_latestChange = new WaitForChangedResult();
_pollingTaskLock = new object();
PollingInterval = pollingInterval;
_pollDone = new ManualResetEventSlim(false);
_pollingTimeoutEvent = new AutoResetEvent(false);
_pollingEnabledEvent = new ManualResetEventSlim(true);
PollingType = PollingType.Watch;
}
public WaitForChangedResult WaitForChanged(WatcherChangeTypes changeType, int timeout)
{
FileSystemEventHandler handler = new FileSystemEventHandler(this.OnInternalFileSystemEventArgs);
RenamedEventHandler handler2 = new RenamedEventHandler(this.OnInternalRenameEventArgs);
this.isChanged = false;
this.changedResult = WaitForChangedResult.TimedOutResult;
if ((changeType & WatcherChangeTypes.Created) != 0)
{
this.Created += handler;
}
if ((changeType & WatcherChangeTypes.Deleted) != 0)
{
this.Deleted += handler;
}
if ((changeType & WatcherChangeTypes.Changed) != 0)
{
this.Changed += handler;
}
if ((changeType & WatcherChangeTypes.Renamed) != 0)
{
this.Renamed += handler2;
}
bool enableRaisingEvents = this.EnableRaisingEvents;
if (!enableRaisingEvents)
{
this.runOnce = true;
this.EnableRaisingEvents = true;
}
WaitForChangedResult timedOutResult = WaitForChangedResult.TimedOutResult;
lock (this)
{
if (timeout == -1)
{
while (!this.isChanged)
{
System.Threading.Monitor.Wait(this);
}
}
else
{
System.Threading.Monitor.Wait(this, timeout, true);
}
timedOutResult = this.changedResult;
}
this.EnableRaisingEvents = enableRaisingEvents;
this.runOnce = false;
if ((changeType & WatcherChangeTypes.Created) != 0)
{
this.Created -= handler;
}
if ((changeType & WatcherChangeTypes.Deleted) != 0)
{
this.Deleted -= handler;
}
if ((changeType & WatcherChangeTypes.Changed) != 0)
{
this.Changed -= handler;
}
if ((changeType & WatcherChangeTypes.Renamed) != 0)
{
this.Renamed -= handler2;
}
return(timedOutResult);
}
static WaitForChangedResult()
{
TimedOutResult = new WaitForChangedResult(0, null, true);
}
