Question

I am currently working on a WPF/.Net project,
In this project the user has the choice to change the the skinning of the app entirely,
I am trying to write those settings after submission using configurations management,
but I don’t seem to be able to add the new values to the app.config file, here is my method underneath

Public Sub SetApplicationSetting(pstrAppSettingName As String, pstrAppSettingValue As String)
    Dim lobjconfig As System.Configuration.Configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None)

    lobjconfig.AppSettings.Settings.Add(pstrAppSettingName, pstrAppSettingValue)
    lobjconfig.Save(ConfigurationSaveMode.Full)
    ConfigurationManager.RefreshSection("appSettings")
End Sub

any ideas?

Now the word on the street is that I cant Add to what is already there, So I thougth maybe I should remove it first before updating,
but still nothing, here is the new code

 Dim lobjconfig As System.Configuration.Configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None)

            lobjconfig.AppSettings.Settings.Remove(pstrAppSettingName)
            lobjconfig.AppSettings.Settings.Add(pstrAppSettingName, pstrAppSettingValue)


               lobjconfig.AppSettings.Settings.CurrentConfiguration.Save()
            lobjconfig.Save(ConfigurationSaveMode.Full, True)

        ConfigurationManager.RefreshSection("appSettings")

Answer 1

My guess is that you are trying to change the configuration for all users (ConfigurationUserLevel.None) and that you might not have the right to do so. I’d expect an exception when that fails, and you didn’t say one was thrown, so I might be on the wrong track.

To find the culprit, you might try ConfigurationUserLevel.PerUserRoamingAndLocal or ConfigurationUserLevel.PerUserRoaming and see if that works better.

Alternatively, but I doubt it makes a difference, you can make getting the configuration from a certain location specifically by using the following line:

Configuration config = ConfigurationManager.OpenExeConfiguration(
                          Assembly.GetEntryAssembly().Location);