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POC# - Predict file system events on folder delete
 

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    <p>This is more a question about what's the best practice in implementing this.</p> <p>I have a <code>FileSystemWatcher</code> which should inform me about User's changes on files and folders. Also subdirs are watched. In the same directory my program does also sometimes changes. I don't want the <code>FileSystemWatcher</code> to detect events on these program changes.</p> <p>My first implementation was a list where I can add expected events. When I get a file system event I check the list and ignore it if it's there. This doesn't sound very robust but it seemed to work.</p> <p>Now I detected the real problem:<br /> D: is watched by the <code>FileSystemWatcher</code>.<br /> I have two folders like that: D:\folder1\folder2<br /> Now I want to delete folder1 (with folder2 in it) with my application. So I put D:\folder1 in my delete list. Then I call something like <code>Directory.Delete(@"D:\folder1", true)</code> . Now I notice that folder1 can't be deleted (why ever) over an exception. I remove the delete entry from my list but folder2 was already deleted and I get his FileSystemEvent. So I get a FileSystem event for D:\folder1\folder2. My program thinks now the user has deleted this folder and is doing the wrong things.</p> <p>I had some ideas now:</p> <p>1.) recursively delete the folder by deleting every file and every folder by it's own. With this I get for every subfolder and file an own list entry. I already implemented it but it is very very very slow.</p> <p>2.) Maybe there is a better way to have clever filters in the <code>FileSystemWatcher</code> to make my list obsolete?</p> <p>3.) Maybe it is possible to only delete a directory tree if it's possible to delete everything. So if it fails I still have everything and if not everything is deleted. This seems to be the most elegant solution for me but no idea if this is even possible?</p> <p>4.) Is it possible to exclusively lock all files and folders by my software? If this this went ok it should be possible delete everything with one delete command or somehow like this?</p> <p>I'm also open for other additional solutions.</p> <p>Edit 1 to make it more clear:</p> <p>I only want to "see" user actions on a folder. If I manipulate things from my program in here I don't want to see this events.</p> <p>With my implementation I get events for subfolders if a folder is locked and can't be deleted.</p> <p>It's not so easy to explain in english because I'm no english native speaker ;).</p> <p>Edit 2:</p> <p>5.) Maybe it is possible to filter in <code>FileSystemWatcher</code> all events from a defined process?</p>
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    1. COWhere's the part in your question about predicting things?
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      1. USCody Gray
    2. COthe list I was writing about is a prediction because it holds the expected events which should come from the FileSystemWatcher later. It works so: 1.) remember in list 2.) manipulate files/folder 3.) ignore events with list
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    3. COSeriously, I am not getting this. What event do you expect? What events are you getting instead? What exceptions are you getting? Please update your questions with these points.
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      1. USEdwin de Koning
 

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