Web.config transformations: How to update an appsetting value

Web projects in Visual studio support the concept of web.config transformations, making it easy to update your configuration depending on the build you are using.

Yesterday I had a hard time to remember what the exact syntax was to update a specific appsetting. So here is a small snippet to help me remember:

	<?xml version="1.0" encoding="utf-8"?>
	<configuration>
	<appSettings>
	<add key="SeqServerUrl" value="http://development/seq"/>
	</appSettings>
	</configuration>

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	<?xml version="1.0" encoding="utf-8"?>
	<!-- For more information on using web.config transformation visit http://go.microsoft.com/fwlink/?LinkId=125889 -->
	<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
	<appSettings>
	<add key="SeqServerUrl" value="http:/productie/seq" xdt:Transform="SetAttributes"
	xdt:Locator="Match(key)"/>
	</appSettings
	</configuration>

view raw web.production.config hosted with ❤ by GitHub