azure devops , displayname with variable

Question

- job: Display_Version
  displayName: Update version $(Number_Version) 
  steps: 
  ....

I am trying to display a variable which is the variables of the pipeline, and it does not display it ... Can anyone explain to me why?

Answer 1

To use the pipeline-level variable in the displayName of a job or a stage, you should use the expression '${{ variables.varName }}'. Because the displayName of jobs and stages are set at compile time.

The expression '${{ variables.varName }}' is called template expression which can be used to get the value of variable at compile time, before runtime starts.

The macro syntax '$(varName)' can get the variable value during runtime before a task runs. So, you can use it in the displayName and the input of a task.

For more details, you can see this document.

Below is an example as reference.

• azure-pipelines.yml

  variables:
    Number_Version: 1.1.0
  
  jobs:
  - job: Display_Version
    displayName: 'Job Name - Update version ${{ variables.Number_Version }}'
    pool:
      vmImage: ubuntu-latest
    steps:
    - task: Bash@3
      displayName: 'Task Name - Update version $(Number_Version)'
      inputs:
        targetType: inline
        script: echo "Input of task - Update version $(Number_Version)"
  

• Result