Matthias Shapiro

I need fewer hobbies

“Operation Not Permitted” On IsolatedStorageSettings in Windows Phone

This is really fast but it took me a while to figure out. I was getting the following on my recent project when I tried to save something using IsolatedStorageSettings:

“Operation not permitted on IsolatedStorageFileStream.”

And I couldn’t find anything about it other than a very generic “Looks like a threading problem” answers.

Long story short:

I was, in rapid succession, running the same save code twice. What I think happened was that the IsolatedStorageFileStream was still open and trying to save when I tried to get it to save again on another thread.

That’s my guess. I figured I’d toss up this short post on it before I forgot what the problem was.

5 Responses to “Operation Not Permitted” On IsolatedStorageSettings in Windows Phone

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  5. Stefan

    If the file is already open for read/write you should not do the same action over that file in the isolated storage. Otherwise you will always receive this exception.