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?

Have you tried to add `System.Diagnostics.Debugger.Launch();` instead of the breakpoint? Might at least prove that it is not an attachment issue. — Davin Tryon, Dec 14 '12 at 23:36
A good text editor never changes a file, that can cause irretrievable data loss. Instead it writes a new file, renames the old file, renames the new file, deletes the old file. No change event. — Hans Passant, Dec 14 '12 at 23:41
BTW, your `LogFileChanged()` method shouldn't `static` ? Because you can't access it from `FileSystemEventHandler` without defining its' class object. — Soner Gönül, Dec 14 '12 at 23:41
Are you 100% sure that there is change event? Consider writing test program that actually explicitly open -> save -> close (instead of new -> save -> delete old/rename new sequence). — Alexei Levenkov, Dec 14 '12 at 23:47

score 8 · Accepted Answer · answered Dec 14 '12 at 23:37

8

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

answered Dec 14 '12 at 23:37

Steve

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score 2 · Answer 2 · answered Dec 14 '12 at 23:34

2

Have you set this property?

 fsw.EnableRaisingEvents = true;

answered Dec 14 '12 at 23:34

Daniel A. White

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1

Yes I just added that, Im afraid it didnt help. – Johan Dec 14 '12 at 23:35
This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post. – durron597 Dec 14 '12 at 23:56
2

@durron597 this is an answer. – Daniel A. White Dec 14 '12 at 23:58

FileSystemWatcher Changed event doesn't fire

2 Answers2

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