Implicit references fail transitively

[jzabroski]

This issue is effectively the same issue @natemcmaster has reported in dotnet/AspNetCore.Docs#9490 (comment) for .NET Core 2.2 -> 3.0 migrations, but the regression goes back to at least 2.1 -> 2.2 upgrades as well:

Preview 1 Known Issue - workaround for NuGet/Home#7342 - projects which do not start with <Project Sdk="Microsoft.NET.Sdk.Web"> will get compiler or runtime errors due to missing Microsoft.AspNetCore.* assemblies. This is most often the case for test projects and class libraries.

Consider the following project structure:

Source
|
 \ WebApi
   |
   \ WebApi.csproj
Tests
|
 \ WebApi.Tests
  |
   \ WebApi.Tests.csproj

and the following definitions for WebApi.csproj and WebApi.Tests.csproj:

WebApi.csproj

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>netcoreapp2.2</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <!-- Implicit Version to avoid MSBuild targets warning -->
    <PackageReference Include="Microsoft.AspNetCore.All" />
    <!--<PackageReference Include="Microsoft.AspNetCore.All" Version="2.2.3" AllowExplicitVersion="true" />-->
</Project>

WebApi.Tests.csproj

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>netcoreapp2.2</TargetFramework>
    <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.0.1" />
    <PackageReference Include="xunit" Version="2.4.1" />
    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1">
      <PrivateAssets>all</PrivateAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
    </PackageReference>
  </ItemGroup>
  <ItemGroup>
    <!-- This could really be any ProjectReference that transitively references a metapackage -->
    <ProjectReference Include="..\WebApi\WebApi.csproj" />
  </ItemGroup>
</Project>

If you build the solution, Tests\WebApi.Tests\obj\project.assets.json will show references to Microsoft.AspNetCore.All metapackage for .NET Core 2.1

The only solution is to use AllowExplicitVersion="true":

<PackageReference Include="Microsoft.AspNetCore.All" Version="2.2.3" AllowExplicitVersion="true" />

The error message is:

Severity: Error		
Code: CS1705
Description: Assembly 'WebApi' with identity 'WebApi, Version=1.5.0.0, Culture=neutral, PublicKeyToken=null' uses 'Microsoft.AspNetCore.Mvc.ViewFeatures, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60' which has a higher version than referenced assembly 'Microsoft.AspNetCore.Mvc.ViewFeatures' with identity 'Microsoft.AspNetCore.Mvc.ViewFeatures, Version=2.1.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'
Project: WebApi.Tests
File: D:\source\John.Zabroski\Source\WebApi.Tests\CSC
Line:	 1
Suppression State: Active

[livarcocc]

@dsplaisted can you take a look?

[jzabroski]

It looks like another possible fix is FrameworkReference, per Nate McMaster. Still, not ideal.

[dsplaisted]

@jzabroski This scenario will be fixed in .NET Core 3.0, which will use FrameworkReferences which will flow transitively.

For 2.2, the ASP.NET Core PackageReference does not flow transitively. However, you should be able to add it to the test project (without a version number, the same as in the web project), and it should work correctly. Have you tried that?

[jzabroski]

@dsplaisted That worked but it's a bit ugly to have to directly include the dependency. I guess it's not much different from how the world worked 4 years ago, so can't complain too much.

Just wondering why this happens so often, and why I'm the one who catches things like this?

One logical reason could be that I define a "cleanfull" target in all my .NET Core projects that does the following:

• Runs MSBuild Clean target
• Runs custom task to remove all nuget packages
• Runs custom task to remove MSTest results directory
• Runs custom task to remove bin and obj directories

PS D:\source\John.Zabroski> .\b.ps1 cleanfull
Microsoft (R) Build Engine version 15.9.21+g9802d43bc3 for .NET Framework
Copyright (C) Microsoft Corporation. All rights reserved.

  Clean: Configuration=[Release] Platform=[Any CPU] SolutionOrProjectFile=[D:\source\John.Zabroski\Source
  /MySolution.sln]
  Clean: Removing NuGet packages directory
  Clean: Removing MSTest results directory
  Clean: Removing bin and obj directories

This plus an integration test would seem to solve a lot of issues. I'm not trying to give people grief, but I wonder how much time would be saved across Microsoft (and outside Microsoft by its customers!) if such automation existed.

[jzabroski]

@dsplaisted Can you please review my updated Docs pull request? dotnet/AspNetCore.Docs#11688 I tried to incorporate your guidance. I left out stuff about FrameworkReference in 3.0 in case that decision changes before final release.

[dsplaisted]

The transitivity issue isn't related to whether your project is clean. It's just how the reference to ASP.NET works in .NET Core 2.2.

We've been iterating on how the ASP.NET dependency is expressed since .NET Core 1.0. While not ideal, the behavior in 2.2 is improved over 2.1, 2.0, etc. We've made some more fundamental changes for .NET Core 3.0, which we believe will be a big improvement and resolve the issues we've had in previous versions with how the ASP.NET dependency works.

[jzabroski]

@dsplaisted Updated original post to reflect my full understanding of the issue.

[jzabroski]

It seems there are two possible positive test cases:

• Implicit references should not fail transitively (when two projects have the same .NET SDK Project Type and same target framework monikers)
• Implicit references should not fail transitively (when two projects have different .NET SDK Project Types but the same target framework monikers)

I'll omit negative test cases here, as we don't seem to know the root cause yet. However, the above positive test cases call attention to the fact https://docs.microsoft.com/en-us/dotnet/core/tools/csproj does not cover how <Project Sdk="X"> values for X may or may not influence metapackages.

[jzabroski]

@dsplaisted Is it possible dotnet host roll forward could be causing you to have difficulty reproducing my issue? How do I share my settings with you? I've just been going through documentation on .NET Core to fully understand what all the knobs are and how they work. See: https://github.com/aspnet/Docs/blob/master/aspnetcore/fundamentals/metapackage-app.md

Quote:

Specifying a version number on the Microsoft.AspNetCore.App reference does not guarantee that version of the shared framework will be chosen. For example, suppose version "2.1.1" is specified, but "2.1.3" is installed. In that case, the app will use "2.1.3". Although not recommended, you can disable roll forward (patch and/or minor). For more information regarding dotnet host roll-forward and how to configure its behavior, see dotnet host roll forward.

So, at compile-time in Visual Studio, you (probably) need to account for whether the user has specified DOTNET_ROLL_FORWARD_ON_NO_CANDIDATE_FX. (I do not have it set, since running $env:DOTNET_ROLL_FORWARD_ON_NO_CANDIDATE_FX in PowerShell Core returns $null).

It also seems the Visual Studio About dialog needs a refresh so that we can consistently nail down why I have this issue you cannot reproduce.

In my case, I have the following Visual Studio "things" installed - but it doesn't list what targeting packs and SDKs I have installed, so you can't really diagnose what roll forward conditions I have:

John Zabroski's Visual Studio Professional 2017 Version 15.9.10 Copy Info

Microsoft Visual Studio Professional 2017 Version 15.9.10 VisualStudio.15.Release/15.9.10+28307.557 Microsoft .NET Framework Version 4.7.03056

Installed Version: Professional

Visual C++ 2017 00370-10200-04083-AA740
Microsoft Visual C++ 2017

ADL Tools Service Provider 1.0
This package contains services used by Data Lake tools

AnkhSVN - Subversion Support for Visual Studio 2.7.12815.35086
AnkhSVN - Subversion Support for Visual Studio 2.7.12815.35086

• Ankh.Package 2.7.12815.35086
• Subversion 1.9.5 via SharpSvn 1.9005.3940.224
• Git/LibGit2 0.24.0 via SharpGit 0.2401.1116.230

SharpSvn is linked to: Apr 1.5.2, Apr-util 1.5.4, Cyrus Sasl 2.1.26, eXpat 2.2.0, LibSSH2 1.8.0, OpenSSL 1.0.2k 26 Jan 2017, Serf 1.3.9, SQLite 3.17.0, Subversion 1.9.5-SharpSvn, Utf8proc 1.1.5, ZLib 1.2.8
SharpSvn is optionally linked to: Berkeley DB 4.4.20, SharpPlink 0.67.0(SharpSvn)

SharpGit is linked to: Apr 1.5.1, Apr-Util 1.5.4, eXpat 2.1.0, Libgit2 0.24.0, LibSSH2 1.7.0, OpenSSL 1.0.2h 3 May 2016, Subversion 1.9.3, Utf8proc 1.1.5, ZLib 1.2.8

Application Insights Tools for Visual Studio Package 8.14.20131.1
Application Insights Tools for Visual Studio

ASP.NET and Web Tools 2017 15.9.04012.0
ASP.NET and Web Tools 2017

ASP.NET Core Razor Language Services 15.8.31590
Provides languages services for ASP.NET Core Razor.

ASP.NET Web Frameworks and Tools 2017 5.2.60913.0
For additional information, visit https://www.asp.net/

Azure App Service Tools v3.0.0 15.9.03024.0
Azure App Service Tools v3.0.0

Azure Data Lake Node 1.0
This package contains the Data Lake integration nodes for Server Explorer.

Azure Data Lake Tools for Visual Studio 2.3.7000.2
Microsoft Azure Data Lake Tools for Visual Studio

Azure Stream Analytics Tools for Visual Studio 2.3.7000.2
Microsoft Azure Stream Analytics Tools for Visual Studio

C# Tools 2.10.0-beta2-63501-03+b9fb1610c87cccc8ceb74a770dba261a58e39c4a
C# components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.

Common Azure Tools 1.10
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.

Cookiecutter 15.9.18254.1
Provides tools for finding, instantiating and customizing templates in cookiecutter format.

Devart Code Compare 5.0.85
Devart Code Compare
Copyright (c) 2012-2017 Devart. All rights reserved.
http://www.devart.com/codecompare/

JavaScript Language Service 2.0
JavaScript Language Service

JavaScript Project System 2.0
JavaScript Project System

JavaScript UWP Project System 2.0
JavaScript UWP Project System

JetBrains ReSharper Ultimate 2018.2.3 Build 182.0.20180912.70621
JetBrains ReSharper Ultimate package for Microsoft Visual Studio. For more information about ReSharper Ultimate, visit http://www.jetbrains.com/resharper. Copyright © 2019 JetBrains, Inc.

Microsoft Azure HDInsight Azure Node 2.3.7000.2
HDInsight Node under Azure Node

Microsoft Azure Hive Query Language Service 2.3.7000.2
Language service for Hive query

Microsoft Azure Stream Analytics Language Service 2.3.7000.2
Language service for Azure Stream Analytics

Microsoft Azure Stream Analytics Node 1.0
Azure Stream Analytics Node under Azure Node

Microsoft Azure Tools 2.9
Microsoft Azure Tools for Microsoft Visual Studio 2017 - v2.9.0.0

Microsoft Continuous Delivery Tools for Visual Studio 0.4
Simplifying the configuration of Azure DevOps pipelines from within the Visual Studio IDE.

Microsoft JVM Debugger 1.0
Provides support for connecting the Visual Studio debugger to JDWP compatible Java Virtual Machines

Microsoft Library Manager 1.0
Install client-side libraries easily to any web project

Microsoft MI-Based Debugger 1.0
Provides support for connecting Visual Studio to MI compatible debuggers

Microsoft Visual C++ Wizards 1.0
Microsoft Visual C++ Wizards

Microsoft Visual Studio Tools for Containers 1.1
Develop, run, validate your ASP.NET Core applications in the target environment. F5 your application directly into a container with debugging, or CTRL + F5 to edit & refresh your app without having to rebuild the container.

Microsoft Visual Studio VC Package 1.0
Microsoft Visual Studio VC Package

MLGen Package Extension 1.0
MLGen Package Visual Studio Extension Detailed Info

NuGet Package Manager 4.6.0
NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/.

PowerShell Pro Tools for Visual Studio 1.0
A set of tools for developing and debugging PowerShell scripts and modules in Visual Studio.

ProjectServicesPackage Extension 1.0
ProjectServicesPackage Visual Studio Extension Detailed Info

Python 15.9.18254.1
Provides IntelliSense, projects, templates, debugging, interactive windows, and other support for Python developers.

Python - Django support 15.9.18254.1
Provides templates and integration for the Django web framework.

Python - IronPython support 15.9.18254.1
Provides templates and integration for IronPython-based projects.

Python - Profiling support 15.9.18254.1
Profiling support for Python projects.

R Tools for Visual Studio 1.3.40517.1016
Provides project system, R Interactive window, plotting, and more for the R programming language.

Redgate SQL Prompt 9.4.14.8687
Write, format, and refactor SQL effortlessly

ResourcePackage Extension 1.0
ResourcePackage Visual Studio Extension Detailed Info

ResourcePackage Extension 1.0
ResourcePackage Visual Studio Extension Detailed Info

SQL Server Data Tools 15.1.61903.01040
Microsoft SQL Server Data Tools

SQL Server Reporting Services 15.0.1300.90
Microsoft SQL Server Reporting Services Designers
Version 15.0.1300.90

ToolWindowHostedEditor 1.0
Hosting json editor into a tool window

TypeScript Tools 15.9.20918.2001
TypeScript Tools for Microsoft Visual Studio

Visual Basic Tools 2.10.0-beta2-63501-03+b9fb1610c87cccc8ceb74a770dba261a58e39c4a
Visual Basic components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.

Visual F# Tools 10.2 for F# 4.5 15.8.0.0. Commit Hash: 6e26c5bacc8c4201e962f5bdde0a177f82f88691.
Microsoft Visual F# Tools 10.2 for F# 4.5

Visual Studio Code Debug Adapter Host Package 1.0
Interop layer for hosting Visual Studio Code debug adapters in Visual Studio

Visual Studio Tools for Containers 1.0
Visual Studio Tools for Containers

Visual Studio Tools for Universal Windows Apps 15.0.28307.556
The Visual Studio Tools for Universal Windows apps allow you to build a single universal app experience that can reach every device running Windows 10: phone, tablet, PC, and more. It includes the Microsoft Windows 10 Software Development Kit.

And here is my dotnet.exe diagnostics:

PS D:\source\GitHub\FluentValidation> dotnet.exe --list-runtimes
Microsoft.AspNetCore.All 2.1.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.3 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.4 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.5 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.7 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.2.3 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 2.1.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.1.3 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.1.4 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.1.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.1.7 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.1.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.2.3 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 1.0.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 1.1.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.0.3 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.0.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.0.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.0.7 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.0.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.3 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.4 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.7 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.8 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.2.3 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
PS D:\source\GitHub\FluentValidation> dotnet.exe --list-sdks
1.0.4 [C:\Program Files\dotnet\sdk]
2.0.2 [C:\Program Files\dotnet\sdk]
2.0.3 [C:\Program Files\dotnet\sdk]
2.1.2 [C:\Program Files\dotnet\sdk]
2.1.4 [C:\Program Files\dotnet\sdk]
2.1.100 [C:\Program Files\dotnet\sdk]
2.1.101 [C:\Program Files\dotnet\sdk]
2.1.103 [C:\Program Files\dotnet\sdk]
2.1.104 [C:\Program Files\dotnet\sdk]
2.1.200 [C:\Program Files\dotnet\sdk]
2.1.202 [C:\Program Files\dotnet\sdk]
2.1.400 [C:\Program Files\dotnet\sdk]
2.1.401 [C:\Program Files\dotnet\sdk]
2.1.402 [C:\Program Files\dotnet\sdk]
2.1.403 [C:\Program Files\dotnet\sdk]
2.1.500 [C:\Program Files\dotnet\sdk]
2.1.502 [C:\Program Files\dotnet\sdk]
2.1.503 [C:\Program Files\dotnet\sdk]
2.1.504 [C:\Program Files\dotnet\sdk]
2.1.505 [C:\Program Files\dotnet\sdk]
2.2.105 [C:\Program Files\dotnet\sdk]
PS D:\source\GitHub\FluentValidation> dotnet.exe --version
2.2.105
PS D:\source\GitHub\FluentValidation>

[jzabroski]

@dsplaisted I built a brand new machine, I put together a full repro of the issue, but noticed some oddities while trying to reproduce the issue. In this case, your guidance to explicitly include an implicitly referenced metapackage without version in the transitive project fails. Here are the errors - I will upload my full repro sln to GitHub for you to look into.

Severity: Error
Code: CS1705
Description: Assembly 'WebApi' with identity 'WebApi, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' uses 'Microsoft.AspNetCore.Mvc.Core, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60' which has a higher version than referenced assembly 'Microsoft.AspNetCore.Mvc.Core' with identity 'Microsoft.AspNetCore.Mvc.Core, Version=1.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'
Project: WebApi.Tests
File: D:\source\GitHub\ImplicitReferencesFailTransitively\Sample\WebApi.Tests\CSC
Line: 1
Suppression State: Active

Severity: Warning
Code: MSB3277
Description: Found conflicts between different versions of "Microsoft.AspNetCore.Hosting.Abstractions" that could not be resolved.  These reference conflicts are listed in the build log when log verbosity is set to detailed.
Project: WebApi.Tests
File: C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\MSBuild\15.0\Bin\Microsoft.Common.CurrentVersion.targets
Line: 2110

Severity: Warning
Code: MSB3277
Description: Found conflicts between different versions of "Microsoft.AspNetCore.Http.Abstractions" that could not be resolved.  These reference conflicts are listed in the build log when log verbosity is set to detailed.
Project: WebApi.Tests
File: C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\MSBuild\15.0\Bin\Microsoft.Common.CurrentVersion.targets
Line: 2110

Severity: Warning
Code: MSB3277
Description: Found conflicts between different versions of "Microsoft.AspNetCore.Mvc.Core" that could not be resolved.  These reference conflicts are listed in the build log when log verbosity is set to detailed.	Project: WebApi.Tests
File: C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\MSBuild\15.0\Bin\Microsoft.Common.CurrentVersion.targets
Line: 2110	

Severity: Warning
Code: NU1604
Description: Project dependency Microsoft.AspNetCore.Mvc.Core does not contain an inclusive lower bound. Include a lower bound in the dependency version to ensure consistent restore results.
Project: WebApi.Tests
File: D:\source\GitHub\ImplicitReferencesFailTransitively\Sample\WebApi.Tests\WebApi.Tests.csproj
Line:1	

Debug Context

MSBuild targets

Get-FileHash of the targets file generating the error, to make sure you and I are comparing apples to apples.

PS C:\Users\john.zabroski> get-filehash "C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\MSBuild\15.0\Bin\Microsoft.Common.CurrentVersion.targets"

Algorithm       Hash                                                                   Path
---------       ----                                                                   ----
SHA256          0E21AE69F27137BE03D4E94F750B2BCDE542CFE2C0F56ACCA8CF277DA6438BF5       C:\Program Files (x86)\Micros...

DotNet dependencies

Here are my new machines dotnet.exe sdks, version, etc. I noticed one oddity here - dotnet.exe file version metadata and --version disagree!

PS C:\Users\john.zabroski> dotnet.exe --list-runtimes
Microsoft.AspNetCore.All 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.2.3 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.2.3 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 1.0.15 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 1.1.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.0.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.2.3 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
PS C:\Users\john.zabroski> dotnet.exe --list-sdks
1.1.13 [C:\Program Files\dotnet\sdk]
2.1.202 [C:\Program Files\dotnet\sdk]
2.1.505 [C:\Program Files\dotnet\sdk]
2.2.105 [C:\Program Files\dotnet\sdk]
PS C:\Users\john.zabroski> get-command dotnet.exe

CommandType     Name                                               Version    Source
-----------     ----                                               -------    ------
Application     dotnet.exe                                         2.2.274... C:\Program Files\dotnet\dotnet.exe


PS C:\Users\john.zabroski> dotnet.exe --version
2.2.105

PS C:\Users\john.zabroski> $env:DOTNET_ROLL_FORWARD_ON_NO_CANDIDATE_FX -eq $null
True

Visual Studio dependencies

Here are my Visual Studio Help About Copy Info

John Zabroski Visual Studio 2017 Copy Info

Microsoft Visual Studio Professional 2017 Version 15.9.10 VisualStudio.15.Release/15.9.10+28307.557 Microsoft .NET Framework Version 4.7.03190

Installed Version: Professional

Visual C++ 2017 00369-60000-00001-AA382
Microsoft Visual C++ 2017

ADL Tools Service Provider 1.0
This package contains services used by Data Lake tools

Application Insights Tools for Visual Studio Package 8.14.20131.1
Application Insights Tools for Visual Studio

ASP.NET and Web Tools 2017 15.9.04012.0
ASP.NET and Web Tools 2017

ASP.NET Core Razor Language Services 15.8.31590
Provides languages services for ASP.NET Core Razor.

ASP.NET Web Frameworks and Tools 2012 4.0.30625.0
For additional information, visit https://www.asp.net/

ASP.NET Web Frameworks and Tools 2017 5.2.60913.0
For additional information, visit https://www.asp.net/

Azure App Service Tools v3.0.0 15.9.03024.0
Azure App Service Tools v3.0.0

Azure Data Lake Node 1.0
This package contains the Data Lake integration nodes for Server Explorer.

Azure Data Lake Tools for Visual Studio 2.3.8000.0
Microsoft Azure Data Lake Tools for Visual Studio

Azure Functions and Web Jobs Tools 15.9.02046.0
Azure Functions and Web Jobs Tools

Azure Stream Analytics Tools for Visual Studio 2.3.8000.0
Microsoft Azure Stream Analytics Tools for Visual Studio

C# Tools 2.10.0-beta2-63501-03+b9fb1610c87cccc8ceb74a770dba261a58e39c4a
C# components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.

Common Azure Tools 1.10
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.

Cookiecutter 15.9.18254.1
Provides tools for finding, instantiating and customizing templates in cookiecutter format.

Dotfuscator Community Edition 5.36.0.7050-e77ce80a6
PreEmptive Protection - Dotfuscator CE

Extensibility Message Bus 1.1.49 (remotes/origin/d15-8@ee674f3)
Provides common messaging-based MEF services for loosely coupled Visual Studio extension components communication and integration.

Fabric.DiagnosticEvents 1.0
Fabric Diagnostic Events

GitHub.VisualStudio 2.6.0.6193
A Visual Studio Extension that brings the GitHub Flow into Visual Studio.

IncrediBuild Build Acceleration 1.5.0.3
IncrediBuild effectively reduces compilation and development times by up to 90%.

JavaScript Language Service 2.0
JavaScript Language Service

JavaScript Project System 2.0
JavaScript Project System

JavaScript UWP Project System 2.0
JavaScript UWP Project System

JetBrains ReSharper Ultimate 2018.3.4 Build 183.0.20190304.43214
JetBrains ReSharper Ultimate package for Microsoft Visual Studio. For more information about ReSharper Ultimate, visit http://www.jetbrains.com/resharper. Copyright © 2019 JetBrains, Inc.

Microsoft Azure HDInsight Azure Node 2.3.8000.0
HDInsight Node under Azure Node

Microsoft Azure Hive Query Language Service 2.3.8000.0
Language service for Hive query

Microsoft Azure Service Fabric Tools for Visual Studio 2.4
Microsoft Azure Service Fabric Tools for Visual Studio

Microsoft Azure Stream Analytics Language Service 2.3.8000.0
Language service for Azure Stream Analytics

Microsoft Azure Stream Analytics Node 1.0
Azure Stream Analytics Node under Azure Node

Microsoft Azure Tools 2.9
Microsoft Azure Tools for Microsoft Visual Studio 2017 - v2.9.0.0

Microsoft Continuous Delivery Tools for Visual Studio 0.4
Simplifying the configuration of Azure DevOps pipelines from within the Visual Studio IDE.

Microsoft JVM Debugger 1.0
Provides support for connecting the Visual Studio debugger to JDWP compatible Java Virtual Machines

Microsoft Library Manager 1.0
Install client-side libraries easily to any web project

Microsoft MI-Based Debugger 1.0
Provides support for connecting Visual Studio to MI compatible debuggers

Microsoft Visual C++ Wizards 1.0
Microsoft Visual C++ Wizards

Microsoft Visual Studio Tools for Containers 1.1
Develop, run, validate your ASP.NET Core applications in the target environment. F5 your application directly into a container with debugging, or CTRL + F5 to edit & refresh your app without having to rebuild the container.

Microsoft Visual Studio VC Package 1.0
Microsoft Visual Studio VC Package

MLGen Package Extension 1.0
MLGen Package Visual Studio Extension Detailed Info

Mono Debugging for Visual Studio 4.13.12-pre (9bc9548)
Support for debugging Mono processes with Visual Studio.

Node.js Tools 1.4.21001.1 Commit Hash:8dd15923800d931b153ab9e4de74e42a74eba5e6
Adds support for developing and debugging Node.js apps in Visual Studio

NuGet Package Manager 4.6.0
NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/.

Office Developer Tools for Visual Studio 2017 ENU 15.0.28224.00
Microsoft Office Developer Tools for Visual Studio 2017 ENU

ProjectServicesPackage Extension 1.0
ProjectServicesPackage Visual Studio Extension Detailed Info

Python 15.9.18254.1
Provides IntelliSense, projects, templates, debugging, interactive windows, and other support for Python developers.

Python - Django support 15.9.18254.1
Provides templates and integration for the Django web framework.

Python - IronPython support 15.9.18254.1
Provides templates and integration for IronPython-based projects.

Python - Profiling support 15.9.18254.1
Profiling support for Python projects.

Python - UWP support 15.9.18254.1
Provides templates and integration for the UWP framework.

Python - VC Project Support 15.8.18116.3
Provides support for launching C++ projects with Python debugging enabled.

R Tools for Visual Studio 1.3.40517.1016
Provides project system, R Interactive window, plotting, and more for the R programming language.

Redgate SQL Prompt 9.4.15.8960
Write, format, and refactor SQL effortlessly

ResourcePackage Extension 1.0
ResourcePackage Visual Studio Extension Detailed Info

ResourcePackage Extension 1.0
ResourcePackage Visual Studio Extension Detailed Info

SQL Server Data Tools 15.1.61903.01040
Microsoft SQL Server Data Tools

Syntax Visualizer 1.0
An extension for visualizing Roslyn SyntaxTrees.

Test Adapter for Boost.Test 1.0
Enables Visual Studio's testing tools with unit tests written for Boost.Test. The use terms and Third Party Notices are available in the extension installation directory.

Test Adapter for Google Test 1.0
Enables Visual Studio's testing tools with unit tests written for Google Test. The use terms and Third Party Notices are available in the extension installation directory.

ToolWindowHostedEditor 1.0
Hosting json editor into a tool window

TypeScript Tools 15.9.20918.2001
TypeScript Tools for Microsoft Visual Studio

Visual Basic Tools 2.10.0-beta2-63501-03+b9fb1610c87cccc8ceb74a770dba261a58e39c4a
Visual Basic components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.

Visual C++ for Cross Platform Mobile Development (Android) 15.0.28107.00
Visual C++ for Cross Platform Mobile Development (Android)

Visual C++ for Linux Development 1.0.9.28218
Visual C++ for Linux Development

Visual F# Tools 10.2 for F# 4.5 15.8.0.0. Commit Hash: 6e26c5bacc8c4201e962f5bdde0a177f82f88691.
Microsoft Visual F# Tools 10.2 for F# 4.5

Visual Studio Code Debug Adapter Host Package 1.0
Interop layer for hosting Visual Studio Code debug adapters in Visual Studio

Visual Studio Tools for Apache Cordova 15.123.7408.1
Visual Studio Tools for Apache Cordova

Visual Studio Tools for CMake 1.0
Visual Studio Tools for CMake

Visual Studio Tools for Containers 1.0
Visual Studio Tools for Containers

Visual Studio Tools for Unity 3.9.0.3
Visual Studio Tools for Unity

Visual Studio Tools for Universal Windows Apps 15.0.28307.556
The Visual Studio Tools for Universal Windows apps allow you to build a single universal app experience that can reach every device running Windows 10: phone, tablet, PC, and more. It includes the Microsoft Windows 10 Software Development Kit.

VisualStudio.Mac 1.0
Mac Extension for Visual Studio

Workflow Manager Tools 1.0 1.0
This package contains the necessary Visual Studio integration components for Workflow Manager.

Xamarin 4.12.3.81 (d15-9@780082716)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.

Xamarin Designer 4.16.13 (45a16efd4)
Visual Studio extension to enable Xamarin Designer tools in Visual Studio.

Xamarin Templates 1.1.128 (6f5ebb2)
Templates for building iOS, Android, and Windows apps with Xamarin and Xamarin.Forms.

Xamarin.Android SDK 9.1.7.0 (HEAD/ba9da7a76)
Xamarin.Android Reference Assemblies and MSBuild support.

Xamarin.iOS and Xamarin.Mac SDK 12.2.1.16 (2dc06c7)
Xamarin.iOS and Xamarin.Mac Reference Assemblies and MSBuild support.

[jzabroski]

@dsplaisted https://github.com/jzabroski/ImplicitReferencesFailTransitively Good luck :)