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Asked: 2026-06-01T02:37:28+00:00

I’m writing a WP7 (Mango) application. I store values in WP7 IsolatedStorageSettings.ApplicationSettings, then I

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I’m writing a WP7 (Mango) application.
I store values in WP7 IsolatedStorageSettings.ApplicationSettings, then I call IsolatedStorageSettings.ApplicationSettings.Save();

If I press back, and leave the screen, and I come back I can read values just fine.
However if I press restart in the debugger (or just restart from the emulator) the ApplicationSettings throws a KeyNotFoundException, as if it didn’t persist…
I haven’t yet tried it on device, I don’t have one available right now.

What can I possibly be doing wrong?

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1 Answer

  1. Editorial Team

    It turns out the problem wasn’t in the emulator AT ALL, so everyone suggesting this is “by design” in emulator turned out to be wrong (but I can’t undo my upvotes as they are locked).

    The problem was that I tried to persisting a non-serializable class, and wp7 handled this by throwing away ALL my settings at next Save(). When I removed that single Add() (or more precisely serialzied that object with JSON.net (which COULD handle it), and persisted the json string) all my problems simply went away.

    Still, ridiculous behavior on wp7’s part.

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