Is there any way to do a “Replace Or Insert” using web.config transformation?

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I’m using web.config transformation as described in the below post in order to generate configs for different environments.

http://vishaljoshi.blogspot.com/2009/03/web-deployment-webconfig-transformation_23.html

I can do a “Replace” transformation by matching on the key, e.g.

<add key="Environment" value="Live" xdt:Transform="Replace" xdt:Locator="Match(key)" />

And I can do “Inserts” e.g.

<add key="UseLivePaymentService" value="true" xdt:Transform="Insert" />

But what I would really find useful is a ReplaceOrInsert transformation, as I can’t always rely on the original config file having/not having a certain key.

Is there any way to do this?

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