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Azure DevOps–Create a build variable in Powershell

After executing the build pipeline, I add a tag to the specific git commit to track the deployed code. This is something that is built-in the Azure DevOps pipeline functionality through the Tag Sources:

Originally I used the $(build.buildNumber) variable to tag the code.  But I updated my project to use a VersionPrefix value inside my directory.build.props file:

Of course this VersionPrefix value is not available as a variable inside my Azure DevOps pipeline. So the question is how can I create a new pipeline variable?

I solved this by creating a small Powershell script that reads the value from the Directory.Build.props file and uses the task.setvariable macro to create a pipeline variable:

More information: Set variables in scripts - Azure Pipelines | Microsoft Learn

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