File listener - how can I know when the file is accessable?

I have a f开发者_如何学编程ile listener on a win service.

I raise event on file created/

some time I get execption "cannot access to the file because it being used by another program" do someone has an idea?

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You could use FileSystemWatcher to get notification on the file system but you should be more explicit if possible.

More info on it here: http://msdn.microsoft.com/en-us/library/system.io.filesystemwatcher.aspx

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My suggestion, even when using a FileSystem watcher, is simply to do a Thread.Sleep(1000) after the FileCreated (or whichever event you are watching) has fired, so that you are 100% sure that the previous process has done with it. I have had a similar experience when using FileSystem watchers, and pausing for a while before trying the access the file fixed the issue.