Dynamically update app.config file using WiX

I have an msi built using WiX. Part of the installer collects some settings that will be entered into the app.config file of the installed app.

Now it works fine if I define <util:XmlFile ... for each setting that is going to change in the wxs file.

Now my question is this: is there a way I c开发者_开发知识库an dynamically create this util:XmlFile tag (e.g. from a custom action) so that I don't have to hard code it in to the wxs for each setting the app.config to update.

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How does it do the collection? Are you doing an AppSearch and populating properties? Can you just use the [PROPERTY] in your XmlFile element? Note [PROP] is the value of PROP in MSI speak.