Raising Events; Halting Execution

[john bailo]

Suppose I am writing a program that has to execute
as series of steps, but at several of the steps, I want
to wait for external events to occur.

For example ( and this relates to another of my posts ),
say I want to execute a method, then wait for a flag
file. Ok, someone suggested using FileSystemWatcher.

So then, say I do that, how do I make an internal event
halt execution on the main method, wait for the event
to be raised when the file appears and then continue
execution?

[Andrew Fell-Gordon]

If you didn't mind the thread being unresponsive you could put the thread to
sleep in a loop.

Suppose that your FileWatcher code set a property when the file was
available, say _FileAvailable
then on your waiting thread you have the loop (in VB.net)

While Not _FileAvailable
system.threading.thread.currentthread.sleep(500)
end while
' Code to run then the file is found

Hope this helps

Andrew Fell-Gordon
Sound Technologies Ltd