How do I update BuildNumber using powershell

Question

I would like to update the Build.BuildNumber variable from a powershell script as a build step.

I've tried:

Write-Host "##vso[task.setvariable variable=BUILD_BUILDNUMBER]1.2.3.4"

and

Write-Host "##vso[task.setvariable variable=Build.BuildNumber]1.2.3.4"

This has not worked.

Answer 1

You'd need to use the Update Build Number function:

Write-Host "##vso[build.updatebuildnumber]1.0.0.$($env:Build_BuildId)"