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POChange default app.config at runtime
 

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    <p>I have the following problem:<br> We have an application that loads modules (add ons). These modules might need entries in the app.config (e.g. WCF configuration). Because the modules are loaded dynamically, I don't want to have these entries in the app.config file of my application.<br> What I would like to do is the following:</p> <ul> <li>Create a new app.config in memory that incorporates the config sections from the modules</li> <li>Tell my application to use that new app.config</li> </ul> <p>Note: I do not want to overwrite the default app.config!</p> <p>It should work transparently, so that for example <code>ConfigurationManager.AppSettings</code> uses that new file.</p> <p>During my evaluation of this problem, I came up with the same solution as is provided here: <a href="https://stackoverflow.com/questions/949696/reload-app-config-with-nunit">Reload app.config with nunit</a>.<br> Unfortunately, it doesn't seem to do anything, because I still get the data from the normal app.config.</p> <p>I used this code to test it:</p> <pre><code>Console.WriteLine(ConfigurationManager.AppSettings["SettingA"]); Console.WriteLine(Settings.Default.Setting); var combinedConfig = string.Format(CONFIG2, CONFIG); var tempFileName = Path.GetTempFileName(); using (var writer = new StreamWriter(tempFileName)) { writer.Write(combinedConfig); } using(AppConfig.Change(tempFileName)) { Console.WriteLine(ConfigurationManager.AppSettings["SettingA"]); Console.WriteLine(Settings.Default.Setting); } </code></pre> <p>It prints the same values twices, although <code>combinedConfig</code> contains other values than the normal app.config.</p>
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    1. USDaniel Hilgarth
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    1. COHosting the modules in separate `AppDomain` with the appropriate configuration file is not an option?
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      1. USJoão Angelo
    2. CONot really, because that would result in lots of Cross-AppDomain calls, because the application interacts quite heavily with the modules.
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      1. USDaniel Hilgarth
    3. COHow about an application restart when a new module needs to be loaded?
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      1. USJoão Angelo
 

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