Azure Devops上的Net Core 3.0 SDK Preview 9的Visual Studio Build失败

Question

I've been struggling with this one all weekend.

I cannot obtain a successful build for Net Core 3 SDK Preview 9 (released 4 September 2019).

I have set up a pipeline solely to:

1. Use the new SDK
2. Implement a global.json file using the new SDK
3. Use Nuget 5.x and Nuget restore to correctly obtain preview packages
4. Visual Studio Build the solution

I'm getting the following errors with the build stage (4):

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 MSB4236: The SDK 'Microsoft.NET.Sdk.Web' specified could not be found.

I was initially getting the same error during the Nuget restore stage (3) before implementing the global.json in step 2, so I know the global.json is being correctly referenced.

Pipeline YAML:

pool:
  name: Azure Pipelines
  demands:
  - msbuild
  - visualstudio

steps:
- task: UseDotNet@2
  displayName: 'Use .Net Core sdk 3.0.100-preview9-014004'
  inputs:
    version: '3.0.100-preview9-014004'
    includePreviewVersions: true

- powershell: |
   $globaljson = '{"sdk": {"version": "3.0.100-preview9-014004"}}';
   $globaljson | out-file './test.app/global.json' -Encoding UTF8
  displayName: 'Global Json'

- task: NuGetToolInstaller@1
  displayName: 'Use NuGet 5.x'
  inputs:
    versionSpec: 5.x
    checkLatest: true

- task: NuGetCommand@2
  displayName: 'NuGet restore'
  inputs:
    restoreSolution: '$(Parameters.solution)'

- task: VSBuild@1
  displayName: 'Build solution **\*.sln'
  inputs:
    solution: '$(Parameters.solution)'
    msbuildArgs: '/p:DeployOnBuild=true /p:WebPublishMethod=Package /p:PackageAsSingleFile=true /p:SkipInvalidConfigurations=true /p:PackageLocation="$(build.artifactstagingdirectory)\\"'
    platform: '$(BuildPlatform)'
    configuration: '$(BuildConfiguration)'

Answer 1

As suggested in the comments you need to install .net core preview 9 before you can use it.

You need to put the code below before your use statement:

- task: DotNetCoreInstaller@0
  displayName: 'Install .net core 3.0 (preview)'
  inputs:
            version: '3.0.100-preview9-014004'

Hope this helps. I use this yml to build on azure devops. I 'forgot' the global.json - added it and it worked.

Update: More from my working pipeline script

pool:
  vmImage: 'windows-latest'

variables:
  solution: '**/*.sln'
  buildPlatform: 'Any CPU'
  buildConfiguration: 'Release'
steps:
- task: DotNetCoreInstaller@0
  displayName: 'Install .net core 3.0 (preview)'
  inputs:
    version: '3.0.100-preview9-014004'

- task: NuGetToolInstaller@1

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

azure-pipelines.yml and global.json are in the root of my project folder.

Answer 2

Set the following variable:

variables:
  MSBuildSDKsPath: 'C:\\hostedtoolcache\\windows\\dotnet\\sdk\\3.0.100-preview9-014004\\sdks'