private void watcher_Changed(object sender, FileSystemEventArgs e)
{
try
{
if (e.ChangeType == WatcherChangeTypes.Changed &&
IsSamePath(this._fileName, e.FullPath))
{
Debug.WriteLine("### File changed " + this._fileName);
// Apart from retrying, the DelayedActions has the nice side effect of also
// collapsing multiple file system events into one action callback.
var change = new FileChangedActions()
{
OrignalName = this._fileName, NewName = e.FullPath, Cache = this, ChangeType = e.ChangeType
};
if (pending == null)
{
_retries = 5;
pending = change;
_actions.StartDelayedAction("reload", () => pending.HandleReload(), TimeSpan.FromSeconds(1));
}
else
{
pending.Add(change);
}
}
}
catch { }
}
private void watcher_Renamed(object sender, RenamedEventArgs e)
{
// Some editors rename the file to *.bak then save the new version and
// in that case we do not want XmlNotepad to switch to the .bak file.
try
{
string ext = Path.GetExtension(e.FullPath);
if (IsSamePath(this._fileName, e.OldFullPath) ||
IsSamePath(this._fileName, e.FullPath))
{
var change = new FileChangedActions()
{
OrignalName = this._fileName, OldName = e.OldFullPath, NewName = e.FullPath, Cache = this, ChangeType = e.ChangeType
};
if (pending == null)
{
_retries = 5;
pending = change;
_actions.StartDelayedAction("reload", () => pending.HandleReload(), TimeSpan.FromSeconds(1));
}
else
{
pending.Add(change);
}
}
} catch
{}
}
internal void CheckReload(FileChangedActions action, string fileName)
{
if (!File.Exists(fileName))
{
// file was deleted...
return;
}
pending = null;
try
{
// Only do the reload if the file on disk really is different from
// what we last loaded.
if (this._lastModified < LastModTime && this._fileName == fileName)
{
// Test if we can open the file (it might still be locked).
using (FileStream fs = new FileStream(this._fileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
fs.Close();
}
FireFileChanged();
}
}
catch (Exception ex)
{
_retries--;
if (_retries > 0)
{
Debug.WriteLine("Retrying after FileStream error: " + ex.Message);
// perhaps the file is still locked by the writer, so try again in a bit.
_actions.StartDelayedAction("reload", () => action.HandleReload(), TimeSpan.FromSeconds(1));
}
else
{
Debug.WriteLine("Giving up after FileStream error: " + ex.Message);
}
}
}
