HowTo add new key to appsettings with WIX

Posted by on Tuesday, March 18, 2014 · 1 Comment 

When adding a new key for appsettings you need to split the action in 3 steps.
1. Create the new empty “add” element
2. Create and set the “key” attribute. The tricky part here is how to add the “key” to new created “add” element from step one. One way is to assume that the new created “add” element is the only element without a “key” attribute
3. Create and set the “value” attribute.

<util:XmlFile 
  Id='conf1' 
  Action="createElement" 
  ElementPath="//configuration/appSettings" 
  Name="add" 
  File="[INSTALLDIR]Web.config" 
  Sequence="1" />
<util:XmlFile 
  Id='conf2' 
  Action="setValue" 
  ElementPath="//configuration/appSettings/add[\[]not(@key)[\]]"
  Name="key" 
  Value="NewConfig" 
  File="[INSTALLDIR]Web.config" 
  Sequence="2" />
<util:XmlFile 
  Id='conf3' 
  Action="setValue" 
  ElementPath="//configuration/appSettings/add[\[]@key='NewConfig'[\]]"
  Name="value" 
  Value="the new value" 
  File="[INSTALLDIR]Web.config"
  Sequence="3" />
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Comments

One Response to “HowTo add new key to appsettings with WIX”
  1. Justin says:
    November 17, 2016 at 14:13

    You are the kindest soul in the known world. I’ve been searching all over for this. Thank you, wix wizard, for saving my job.

    Reply

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