Update app.config from WIX setup?

Question

I am trying Wix 3.6 and this is how it looks right now :

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Answer 1

You could add in a reference to the WixUtilExtension.dll to the installer project, then use XmlFile to update the app.config like:

<Property Id="SERVICEADDRESS" Value="http://serviceaddress"/>

<util:XmlFile Id="UpdateBaseAddress" 
  Action="setValue" 
  File="[DirApplication]$(var.app.config)"
  SelectionLanguage="XPath" 
  Permanent="yes"
  ElementPath="/configuration/applicationSettings/...."
  Name="baseAddress" Value="[SERVICEADDRESS]" />

Note that you'll need to set the directory and the name of the .config file (you could just use $(var.ProjectName.TargetFileName).config which should work it out for you automatically