FileSystemWatcher Works In WinForms but not in WPF

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Hi.

After reading a number of articles (directed to by the good guys here :-)), i was able to come across FileSystemWatcher class that enabled me to monitor changes on various locations in my computer. To begin with, i tried on Windows Forms and it all worked all fine. Given that FileSystemWatcher, by default, runs on a separate thread from the Main Thread, the folks at Microsoft made this line:

watcher.SynchronizingObject = this;

which allows the FileSystemWatcher to work alongside the Main Thread, thus solving the illegal cross thread error.

Tranfering the logic in WPF, the same line is actually a compile error saying:

C#

Cannot implicitly convert type 'MyProject.MainWindow' to 'System.ComponentModel.ISynchronizeInvoke'. An explicit conversion exists (are you missing a cast?)

Why could this be the case and what could be the solution?

Thanks :-)

Posted 1-Sep-12 4:20am

Wamuti

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Wendelius · Accepted Answer · 2012-09-01T07:19:00

Solution 1

I would suggest that you don't try to tie the FileSystemWatcher to the UI directly. Instead when you need to update the UI based on the events of the FileSystemWatcher you can use Dispatcher.CheckAccess[^] method to resolve if the thread is correct to update the UI.

Posted 1-Sep-12 7:19am

Wendelius

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Wamuti 9-Sep-12 11:56am

Thanks. I tried it and it works. Thanks!!

Wendelius 9-Sep-12 12:02pm

You're welcome :)