To remove array string item from config file - azure

Question

How to remove a string array item from the config file?
<configuration>
<applicationSettings>
<Sample.Service.Properties.Settings>
<setting name="SampleAttribute" serializeAs="Xml">
<value>
<ArrayOfString xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<string>firstemail#domain.com</string>
<string>secondemail#domain.com</string>
</ArrayOfString>
</value>
I am able to access the first item (firstemail#domain.com) from the config file and can replace the value by the following code.
But my question is how to remove the second item(secondemail#domain.com) from the config file through following similar code.
{
"configuration/applicationSettings/Sample.Service.Properties.Settings/setting[#name='SampleAttribute']/value/ArrayOfString/string[0]":"$(SampleAttribute)"
}

Answer 1

To remove array string item from config file
I am afraid we could not use the File Transform (not sure whether the Config Transform you said is file Transform or Config Transformation) to remove the array string item.
To resolve this issue, you could use the task Replace Tokens to replace the first item and remove the second item:
The format of variable in config file is #{EmailOne}# & #{EmailTwo}#.
My test config file like:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<applicationSettings>
<Sample.Service.Properties.Settings>
<setting name="SampleAttribute" serializeAs="Xml">
<value>
<ArrayOfString xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<string>#{EmailOne}#</string>
#{EmailTwo}#
</ArrayOfString>
</value>
</setting>
</Sample.Service.Properties.Settings>
</applicationSettings>
</configuration>
Then we just need to define the variable EmailOne and EmailTwo in the Variables with replace value and empty value:
The test result:
Inline Powershell Scripts:
$appConfigFile = "$(System.DefaultWorkingDirectory)\xxx\xxx\web.config" #change the path to your config file.
$appConfig = New-Object XML
$appConfig.Load($appConfigFile)
foreach($BuildNumber in $appConfig.configuration.applicationSettings."Sample.Service.Properties.Settings".setting.value.ArrayOfString)
{
$BuildNumber.RemoveChild($BuildNumber.FirstChild.NextSibling)
}
$appConfig.Save($appConfigFile)