FileSystemWatcher Changed event doesn't fire

Question

FileSystemWatcher fsw = new FileSystemWatcher();
fsw.Path = @"C:\foo.txt";
fsw.Changed += new FileSystemEventHandler(LogFileChanged);

private void LogFileChanged(object s, FileSystemEventArgs e)
{ 

}

If i put a breakpoint in LogFileChanged() -> open and edit foo.txt -> saves the file, the breakpoint doesn't hit. Can someone explain what I missed?

Answer 1

This is a file not a path

fsw.Path = @"C:\foo.txt";

you need to set

fsw.Path = @"C:\";
fsw.Filter = "foo.txt";

Filter Property

Answer 2

你有这个属性吗？

 fsw.EnableRaisingEvents = true;