How to preserve app.config between ClickOnce app updates?

My ClickOnce app includes an app.config file, which the app does modify according to the user's preferences. I开发者_StackOverflow社区t appears, though, that every time my clients get a new version of the app, the app.config file gets reset to its original state.

Is there any way to preserve the app.config file between ClickOnce updates?

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The app.config is used to store application configurations. For user custom configurations you should be using a .settings file.

The only way I know to keep the user app config is to save a copy of the file before publishing and, post publishing, replace the

publish_dir/version_dir/app.config.deploy

with the copy.

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I would separate the configuration settings from the application cache. We rolled our own class for storing and updating config values rather than use the built-in ones.

http://robindotnet.wordpress.com/2009/08/19/where-do-i-put-my-data-to-keep-it-safe-from-clickonce-updates/