Azure CI pipeline for Blazor .NET 5 doesn't work

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I have an existing Azure CI pipeline for a WebAssembly Blazor application, that works with .NET Core 3.1.

I upgraded the application to use .NET 5 RC, and the pipeline doesn't work anymore.

Following suggestions, I removed the NuGet task, and I inserted two new tasks:

- task: UseDotNet@2
  displayName: 'Use .NET Core sdk 5.0.100-rc.1.20452.10'
  inputs:
    version: '5.0.100-rc.1.20452.10'
    includePreviewVersions: true

- task: DotNetCoreCLI@2
  displayName: 'dotnet restore'
  inputs:
    command: restore
    projects: '**/*.csproj'

that work.

But the build task fails with:

...
ValidateSolutionConfiguration:
  Building solution configuration "release|any cpu".
  It was not possible to find any installed .NET Core SDKs
  Did you mean to run .NET Core SDK commands? Install a .NET Core SDK from:
      https://aka.ms/dotnet-download
##[error]Test1\Server\Server.csproj(0,0): Error : Unable to locate the .NET Core SDK. Check that it is installed and that the version specified in global.json (if any) matches the installed version.
D:\a\1\s\Test1\Server\Server.csproj : error : Unable to locate the .NET Core SDK. Check that it is installed and that the version specified in global.json (if any) matches the installed version.
##[error]Test1\Server\Server.csproj(0,0): Error MSB4236: The SDK 'Microsoft.NET.Sdk.Web' specified could not be found.
Project "D:\a\1\s\FluidTickets.sln" (1) is building "D:\a\1\s\Test1\Server\Server.csproj" (2) on node 1 (default targets).
D:\a\1\s\Test1\Server\Server.csproj : error MSB4236: The SDK 'Microsoft.NET.Sdk.Web' specified could not be found.
Done Building Project "D:\a\1\s\Test1\Server\Server.csproj" (default targets) -- FAILED.
...

In another answer here in StackOverflow, I read about adding a new variable:

MSBuildSDKsPath = C:\agent\_work\_tool\dotnet\sdk\5.0.100-rc.1.20452.10\Sdks

But if I do this, it's the restore task to fail, before the build one. So it looks like the SDK is 'reachable', in some way...
Any other idea?
Thanks in advance.

azure-pipelines-build-task .net-5 blazor
2 Answers

Change your UseDotNet task to the following in order to make sure that the Visual Studio 2019 preview is used in conjunction with .NET5 preview:

- task: UseDotNet@2
  displayName: 'Use .NET 5 SDK (preview)'
  inputs:
    packageType: 'sdk'
    version: '5.0.100-rc.1.20452.10'
    vsVersion: '16.8.0'
    includePreviewVersions: true

Full YAML pipeline for your reference (this is working for my Blazor WASM .Net 5 project):

pool:
  vmImage: 'ubuntu-latest'

steps:

- task: UseDotNet@2
  displayName: 'Use .NET 5 SDK (preview)'
  inputs:
    packageType: 'sdk'
    version: '5.0.100-rc.1.20452.10'
    vsVersion: '16.8.0'
    includePreviewVersions: true

- task: DotNetCoreCLI@2
  displayName: 'NuGet restore'
  inputs:
    command: 'restore'
    projects: 'MyProject/MyProject.csproj'
    verbosityRestore: 'Normal'

- task: DotNetCoreCLI@2
  displayName: 'Build'
  inputs:
    zipAfterPublish: true
    command: publish
    publishWebProjects: false
    projects: 'MyProject/MyProject.csproj'
    arguments: '-c $(Build.Configuration) -o $(Build.ArtifactStagingDirectory) --no-restore'

- task: PublishBuildArtifacts@1
  displayName: 'Publish'
  inputs:
    PathtoPublish: '$(Build.ArtifactStagingDirectory)'
    ArtifactName: 'drop'
    publishLocation: 'Container'
user_27483260

It's also worth noting that once you upgrade your api to use NET 5 you need to go into Azure Portal > App Services > Your api > Configuration > General Settings & switch Stack to NET and switch NET framework version to NET 5.

user_42674230
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