Transforms
You can apply little transforms by just writing XML transformation on configuration files. For instance here is one for adding a section to the system.web
section of the configuration file
<?xml version="1.0"?>
<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
<system.web>
<machineKey xdt:Transform="Insert" decryptionKey="abc" validationKey="def" />
</system.web>
</configuration>
Here is one for removing an attribute
<?xml version="1.0"?>
<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
<system.web>
<compilation xdt:Transform="RemoveAttributes(debug)" />
</system.web>
</configuration>
How about changing an attribute based on matching the key?
<?xml version="1.0"?>
<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
<appSettings>
<add key"MaxUsers" value="3" xdt:Transform="SetAttributes" xdt:Locator="Match(key)" />
</appSettings>
</configuration>
If you happen to be using Octopus Deploy they have a feature you can add to your IIS deployment task to run these transformations
Testing
There is a great little online testing tool at https://elmah.io/tools/webconfig-transformation-tester/ where you can plug in random things until you get them working.