Creating a System.Configuration.Configuration by merging two config files?

I have two .config files, and I need a System.Configuration.Configuration that is a partial merge between them?

I can read the files as XML and create the desired merge easily, but then it's a string or XDocument. However, .net's System.Configuration seems to be stricly file based, so I would have to write it to a temp directory which I'd like to avoid.

Is there a way to do that?

Example, config1.config:

<configuration>
    <appSettings>
        <add key="CacheTime" value="300" />
    </appSettings>
    <system.serviceModel>
        <behaviors>
          <endpointBehaviors>
            <behavior name="MyBehavior">
               <!-- snipped -->
            </behavior>
          </endpointBehaviors>
        </behaviors>
    </system.serviceModel>
</configuration>

and config2.config:

<configuration>
    <system.serviceModel>
     <client>
          <endpoint name="MyEndpoint" address=开发者_如何学Go"net.tcp://...."
            behaviorConfiguration="MyBehavior" binding="netTcpBinding"
            contract="IMyContract">
          </endpoint>
     </client>
    </system.serviceModel>
</configuration>

The resulting Configuration should then be the union of these two, so that I have both the AppSetting and the Endpoint. Now, this example contains WCF, but I'm not looking for a WCF specific solution, as I absolutely need a System.Configuration.Configuration object.

config1 and config2 are just examples - the actual combination of them is non-deterministic, I might have config1 and config4 or config 3 and config4 or config2 and config3.

If your goal is to simply make your configuration files more modular (and potentially protect file access to particular sections), have a look at System.Configuration.SectionInformation.ConfigSource.