当前.NET SDK在Visual Studio 2017更新15.9.3中不支持定位.NET Standard 2.0错误，已安装.NET Core 2.2.1 SDK

Question

It seems I cannot do any .NET standard 2.0 based projects after a clean install.

I am on the latest version of the .NET Framework 4.7.2, VS 2017 - 15.9.3 and .NET Core 2.2.1

I have installed both the x64/x86 versions of the .NET 2.2 SDK

Attached is my setup info,

EDIT : Actual error when opening a solution with a .NET Standard 2.0 project inside it

The current .NET SDK does not support targeting .NET Standard 2.0.  Either target .NET Standard 1.6 or lower, or use a version of the .NET SDK that supports .NET Standard 2.0. 
Microsoft.Extensions.HealthChecks.SqlServer 
C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\MSBuild\Sdks\Microsoft.NET.Sdk\build\Microsoft.NET.TargetFrameworkInference.targets    126 

EDIT2 Seems like my question confused people that answered, my specific issue is to do with some how .NET Standard 2.0 missing from my machine and nothing to do with an error a project is throwing (its throwing the error because of missing framework)

I will post a new question about this as this got focused on a specific project in my solution vs the actual error.

EDIT 3 More focused question on the actual problem Missing .NET Standard 2.0 Framework with latest .NET Core SDK 2.2.1, .NET Framework 4.7.2, VS2017 15.9.3

closing this one

Answer 1

If you format the error you'll see it's thrown by the Microsoft.Extensions.HealthChecks.SqlServer extension which hasn't been updated for a year and doesn't look like a Microsoft extension either - it's published by a user named seven who published a bunch of packages with Microsoft prefixes about a year ago and then went silent.

I'd strongly suggest removing that extension. You could make it work if you installed the .NET Core runtime it needs but I wouldn't trust something that doesn't even have a link to its project page

Update

Checking the package's dependencies shows it depends on an abandoned package by the same user. The source link points to a fork of the experimental HealthChecks repository that was never released.

As the original link shows, those analyzers were replaced by the classes in the Microsoft.AspNetCore.Diagnostics and eventually released as the official Microsoft.AspNetCore.Diagnostics.HealthChecks package, that does support .NET Standard 2.0