How to replace value with more than one attribute in config file in Azure DevOps?

Question

I have a file called entlib.config like below:

<loggingConfiguration name="Logging Application Block" tracingEnabled="true"
  defaultCategory="General" logWarningsWhenNoCategoriesMatch="true">
<listeners >
  <add name="Email TraceListener" toAddress="axx.xxx@xxx.com" fromAddress="axx.xxx@xxx.com" subjectLineStarter="xxxxx " subjectLineEnder="" smtpServer="xxx.com" smtpPort="xxx" formatter="Text Formatter"

Now,in this file needs to replace fromAddress, toAddress and subjectLineStarter attribute has a variables groups for azure pipeline... how to do this change ? can we do have an option to change any config file that has been created as xml to change more than one attribute ?

Answer 1

To replace the vaules in **.config file with the variables in Variable group, you can try the following methods:

1.You can use the XML variable substitution option in the Azure App service deploy task or IIS deploy task.

For more detailed steps, refer to this doc: XML variable substitution

2.You can use PowerShell script to modify attributes in the config file.

Here is the PowerShell script sample:

$entlibConfig = 'path\entlib.config'

Function updateConfig($config) 
{ 
$doc = (Get-Content $config) -as [Xml]
$root = $doc.get_DocumentElement();
$activeConnection = $root.loggingConfiguration.listeners.SelectNodes("add"); #You need to define the correct location of the parameter
$activeConnection.SetAttribute("fromAddress", "$(fromAddress)");
$activeConnection.SetAttribute("toAddress ", "$(toAddress )“);
$activeConnection.SetAttribute("subjectLineStarter ", "$(subjectLineStarter )“);
$doc.Save($config)
} 

updateConfig($entlibConfig)

3.When you add the mark: #{..}# in entlib.config file, you can try to use the Replace Token task from Replace Tokens Extension.

Refer to the example in this ticket:How to perform XML Element substitution in web.config using Replace Tokens?