private void OnFileChanged(object source, FileSystemEventArgs e)
{
Console.WriteLine("File: " + e.FullPath + " " + e.ChangeType);
switch (e.ChangeType)
{
case WatcherChangeTypes.Changed:
// [BIB]: https://stackoverflow.com/a/3042963
var modTime = File.GetLastWriteTime(TailedFilePath);
if (modTime != LastModified)
{
LastModified = modTime;
TailedFileChangeType temp = TailedFileChangeType.NoContentChange;
int linesRead = lsLinesInFile.Count;
var currentSize = new FileInfo(TailedFilePath).Length;
if (currentSize > StreamSize)
{
if (TailToEOF(out bool lastLineExtended))
{
linesRead = lsLinesInFile.Count - linesRead;
if (lastLineExtended)
{
temp = TailedFileChangeType.LastLineExtended;
}
else if (linesRead > 0)
{
temp = TailedFileChangeType.LinesAdded;
}
else
{
temp = TailedFileChangeType.Shrunk;
}
}
}
else
{
/**
* Treat both reduced file size and and unaltered file size as shrunk because we're not sure where
* the change has happened within the file; Hence a complete reset makes more sense.
*/
temp = TailedFileChangeType.Shrunk;
}
if (temp == TailedFileChangeType.Shrunk)
{
fileStream.Close();
InitTailing();
}
// [BIB]: https://stackoverflow.com/questions/33233161/how-to-ensure-that-streamreader-basestream-length-will-return-the-correct-value
// [BIB]: https://stackoverflow.com/a/20863065
StreamSize = currentSize;
OnTailedFileChanged(this, new TailedFileChangedEventArgs(temp, linesRead));
}
break;
case WatcherChangeTypes.Deleted:
fileStream.Close();
InitTailing();
OnTailedFileChanged(this, new TailedFileChangedEventArgs(TailedFileChangeType.Deleted));
break;
}
}
private void OnFileChanged(object source, FileSystemEventArgs e)
{
Console.WriteLine($"File: {e.FullPath} {e.ChangeType}");
switch (e.ChangeType)
{
case WatcherChangeTypes.Changed:
// [BIB]: https://stackoverflow.com/a/3042963
var modTime = File.GetLastWriteTime(FilePath);
if (modTime != LastModified)
{
LastModified = modTime;
TailedFileChangeType temp = TailedFileChangeType.NoContentChange;
int linesRead = LineCount;
var currentSize = new FileInfo(FilePath).Length;
if (currentSize > FileSize)
{
ReadLinesToEOF();
}
else
{
// Treat both reduced file size and unaltered file size as shrunk
// because the the file may've changed other than at tail.
temp = TailedFileChangeType.Shrunk;
}
if (temp == TailedFileChangeType.Shrunk)
{
ReInitTailing();
}
// [BIB]: https://stackoverflow.com/questions/33233161/how-to-ensure-that-streamreader-basestream-length-will-return-the-correct-value
// [BIB]: https://stackoverflow.com/a/20863065
LastKnownSize = currentSize;
TailedFileChangedEventHandler(this, new TailedFileChangedEventArgs(temp, linesRead));
}
break;
}
}
// [BIB]: https://www.codeproject.com/Articles/9355/Creating-advanced-C-custom-events
#region Constructors
/// <summary>
/// Initializes a new instance of TailedFileChangedEventArgs
/// </summary>
/// <param name="changeType">Indicates the type of change that has occured.</param>
/// <param name="changedLinesCount">Number of lines that have changed.</param>
public TailedFileChangedEventArgs(TailedFileChangeType changeType, int changedLinesCount = 0)
{
ChangeType = changeType;
ChangedLinesCount = changedLinesCount;
}