MSBuild targets for publishing all Azure Function projects in a repo

_azure-pipelines.yml

trigger:
  branches:
    include:
    - master

pool:
  vmImage: 'windows-latest'

variables:
  solution: '**/*.sln'
  buildPlatform: 'Any CPU'
  buildConfiguration: 'Release'

steps:

- task: UseDotNet@2
  displayName: 'Get .NET Core SDK'
  inputs:
    packageType: sdk
    version: 2.2.207
  continueOnError: true

- task: NuGetToolInstaller@0
  displayName: 'Get NuGet'
  inputs:
    versionSpec: 4.9.1

- task: NuGetCommand@2
  displayName: 'Restore'
  inputs:
    restoreSolution: '$(solution)'

- task: VSBuild@1
  displayName: 'Build'
  inputs:
    solution: '$(solution)'
    msbuildArgs: '-m /t:PublishArtifacts /p:ArtifactsDir=$(Build.ArtifactStagingDirectory)'
    platform: '$(buildPlatform)'
    configuration: '$(buildConfiguration)'

- task: PublishBuildArtifacts@1
  displayName: 'Publish'
  inputs:
    PathtoPublish: '$(Build.ArtifactStagingDirectory)'
    ArtifactName: 'drop'
    publishLocation: 'Container'

_publish.bat

"C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\MSBuild\Current\Bin\msbuild.exe" "d:\a\1\s\MySolution.sln" /nologo /nr:false -m /t:PublishArtifacts /p:ArtifactsDir=d:\a\1\a /p:platform="Any CPU" /p:configuration="Release" /p:VisualStudioVersion="16.0"

Directory.Build.props

<Project>
  <PropertyGroup>
    <StagingDir Condition="'$(StagingDir)' != ''">$([MSBuild]::NormalizeDirectory('$(StagingDir)'))</StagingDir>
    <StagingDir Condition="'$(StagingDir)' == ''">$([MSBuild]::NormalizeDirectory($(SolutionDir), 'staging'))</StagingDir>
    <ArtifactsDir Condition="'$(ArtifactsDir)' != ''">$([MSBuild]::NormalizeDirectory($(ArtifactsDir)))</ArtifactsDir>
    <ArtifactsDir Condition="'$(ArtifactsDir)' == ''">$([MSBuild]::NormalizeDirectory($(SolutionDir), 'artifacts'))</ArtifactsDir>
  </PropertyGroup>
</Project>

Directory.Build.targets

<Project>
  <Import Project="builds\PublishArtifacts.Empty.targets" /> <!-- A do-nothing target -->
  <Import Project="builds\PublishArtifacts.AzureFunctions.targets" Condition="'$(AzureFunctionsVersion)' != ''"/> <!-- Filtered to Azure Functions projects -->

  <Target Name="PreparePublishArtifacts" BeforeTargets="PublishArtifacts">
    <MakeDir Directories="$(StagingDir);$(ArtifactsDir)" />
  </Target>

  <Target Name="CleanArtifacts" AfterTargets="AfterClean">
    <RemoveDir Directories="$(StagingDir);$(ArtifactsDir)" />
  </Target>
</Project>

PublishArtifacts.Azure.Functions.targets

<Project>
  <Target Name="PublishArtifacts">
    <PropertyGroup>
      <_ThisProjectStagingDir>$(StagingDir)$(MSBuildProjectName)</_ThisProjectStagingDir>
      <_ThisProjectArtifactDir>$([System.IO.Path]::Combine($(ArtifactsDir),'$(MSBuildProjectName)'))</_ThisProjectArtifactDir>
    </PropertyGroup>

    <MSBuild Projects="$(MSBuildProjectFile)" Targets="Publish" Properties="PublishDir=$(_ThisProjectStagingDir)" />
    <MakeDir Directories="$(_ThisProjectArtifactDir)" />
    <ZipDirectory SourceDirectory="$(_ThisProjectStagingDir)" DestinationFile="$(_ThisProjectArtifactDir)\$(MSBuildProjectName).zip" Overwrite="true" />
  </Target>
</Project>

PublishArtifacts.Empty.targets

<Project>
  <Target Name="PublishArtifacts">
    <Message Importance="normal" Text="$(MSBuildProjectFile) has nothing to publish" />
  </Target>
</Project>

Directory.Build.props and Directory.Build.targets go into the root of the repo so they get picked up automatically. Create a directory called build and add PublishArtifacts.Azure.Functions.targets or edit Directory.Build.targets to point to the location of your preference.

You can test this locally by running the command in _publish.bat or update your azure-pipelines.yaml to send the correct msbuildArgs in the VSBuild@1.