MsBuild.Sdk.Extras fails to compile with Azure 2019 and 3.0.100-preview-010184

Hi,

I spoke to @onovotny (the author of MsBuild.Sdk.Extras) and he suggested opening a ticket here.

At the moment I am trying to update ReactiveUI’s build scripts to use the new Azure Devops VS2019 image. This is not an issue with running locally with .NET Core 3.0 SDK installed globally.

My build script first uses the install ‘dotnet 3.0 sdk’ and then tries to compile. The dotnet sdk gets installed into the tools cache directory on the hosted azure host.

- task: DotNetCoreInstaller@0
    displayName: Install Dot Net Core v3.0.100-preview-010184
    inputs:
        version: '3.0.100-preview-010184'

I have the following global.json file (and tried with and without the sdk version)

{
    "sdk": {
        "version": "3.0.100-preview-010184"
    },
    "msbuild-sdks": {
        "MSBuild.Sdk.Extras": "2.0.0-preview.21"
    }
}

I get the following build errors:

Building Splat.csproj
Microsoft (R) Build Engine version 16.0.360-preview+g9781d96883 for .NET Framework
Copyright (C) Microsoft Corporation. All rights reserved.

D:\a\1\s\src\Splat\Splat.csproj : error : C:\hostedtoolcache\windows\dncs\3.0.100-preview-010184\x64\sdk\3.0.100-preview-010184\Sdks\MSBuild.Sdk.Extras\Sdk not found. Check that a recent enough .NET Core SDK is installed and/or increase the version specified in global.json.
D:\a\1\s\src\Splat\Splat.csproj : error : C:\hostedtoolcache\windows\dncs\3.0.100-preview-010184\x64\sdk\3.0.100-preview-010184\Sdks\MSBuild.Sdk.Extras\Sdk not found. Check that a recent enough .NET Core SDK is installed and/or increase the version specified in global.json.
D:\a\1\s\src\Splat\Splat.csproj : error MSB4236: The SDK 'MSBuild.Sdk.Extras' specified could not be found.

[clairernovotny]

Here’s a workaround for now:

With PowerShell, either inline or as a task

iex ((New-Object System.Net.WebClient).DownloadString('https://raw.githubusercontent.com/onovotny/UpdateVsOnAgent/master/Fix-VisualStudioPreviewNuGetSdk.ps1'))

- powershell: iex ((New-Object System.Net.WebClient).DownloadString('https://raw.githubusercontent.com/onovotny/UpdateVsOnAgent/master/Fix-VisualStudioPreviewNuGetSdk.ps1'))
  displayName: VS Preview workaround

[clairernovotny]

This is from the binlog:

Failed to parse "d:\a\1\s\Rx.NET\Source\global.json". Could not load file or assembly 'Newtonsoft.Json, Version=9.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed' or one of its dependencies. The system cannot find the file specified.