Open other program's configuration files

Question

I have a program A, it also have an app.config file where I have added some keys like server address, username and password for connecting to a server. It is a console application. Now I want to make a UI which I have done. In that UI I want to modify the content of app.config of program A. How do I do that?

Here is what I tried, I copied the UI (basically an .exe) to program A's directory, where the app.config also resides. Then in the UI, I use the ConfigurationManager class's OpenExeConfiguration method, and passing the program A's filename as an argument. But it throws and exception of type System.Configuration.ConfigurationErrorsException.

So I think that my approach is incorrect. How shall I do this?

EDIT: Oh I forgot to tell I'm using C#, .NET 3.5 and VS 2008 (if that helps :D)

Can you add a code sample of the call to OpenExeConfiguration, and more details about the exception? — Fredrik Mörk
– Fredrik Mörk, Commented Jun 2, 2009 at 9:09

Neil Barnwell · Accepted Answer · 2016-08-05 08:33:33Z

14

I'm not sure about the problem with your approach (try adding the stack trace to your post) but this is how I do it:

var configMap = 
    new ExeConfigurationFileMap
    {
        ExeConfigFilename = externalConfigurationFile
    };
System.Configuration.Configuration externalConfiguration =
    ConfigurationManager.OpenMappedExeConfiguration(
        configMap,
        ConfigurationUserLevel.None);

foreach (var setting in externalConfiguration.AppSettings.Settings)
{
    ...
}

externalConfiguration.Save(ConfigurationSaveMode.Full);

edited Aug 5, 2016 at 8:33

answered Jun 2, 2009 at 9:11

Neil Barnwell

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1 Comment

Ed Bayiates Over a year ago

I think the last line should be externalConfiguration.Save rather than currentConfiguration.Save

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