Delete an attribute in appSettings section with Web.config transformation

Question

Is it possible to transform the following Web.config appSettings file:

<example Hostname="https://xxx.build" ClientSecretKey="myclientsecret" clientId="555" clientSecret="666"></example>

into something like this:

<example Hostname="https://xxx.build" ClientSecretKey="myclientsecret">/example>

I want to remove clientId and clientSecret from that setting

Answer 1

You can use the RemoveAttributes feature of web.config transformations for that. Your transform file would look like this:

<example xdt:Transform="RemoveAttributes(clientId,clientSecret)">

This will automatically remove those two attributes from the example element. An alternative approach is to replace the entire example element but leaving out the two attributes:

<example Hostname="https://xxx.build" ClientSecretKey="myclientsecret" xdt:Transform="Replace"></example>

Both transformations are tested and working with the Web.config Transformation Tester. There is more information about XDT and examples in this blog post: Web.config transformations - The definitive syntax guide.