VS2017 .NET Core Projects Load Failed

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If you use Visual Studio 2017 and create an .NET Core projects the first time, the following errors might appear:

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. XXXProject C:Files (x86)Visual Studio\2017.NET.Sdk.NET.TargetFrameworkInference.targets

Another related issue is .NET Core project load failed. Both errors point out that the corresponding .NET SDK is missing.

If you follow the instructions to install .NET Core SDK with a random version from here: https://aka.ms/dotnet-download . Most likely that the issue cannot be resolved.

Check Installed SDKs

Use dotnet --info: 

$ dotnet --info
.NET Core SDK (reflecting any global.json):
 Version:   2.2.401
 Commit:    729b316c13

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.14393
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\2.2.401\

Host (useful for support):
  Version: 2.2.8
  Commit:  b9aa1abc51

.NET Core SDKs installed:
  2.1.202 [C:\Program Files\dotnet\sdk]
  2.1.511 [C:\Program Files\dotnet\sdk]
  2.2.207 [C:\Program Files\dotnet\sdk]
  2.2.300 [C:\Program Files\dotnet\sdk]
  2.2.401 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:
  Microsoft.AspNetCore.All 2.1.15 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.2.5 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.2.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.15 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.2.5 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.2.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.0.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.15 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.2.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.2.8 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]

To install additional .NET Core runtimes or SDKs:
  https://aka.ms/dotnet-download

It seems that there are many existing .NET Core 2.2.x SDKs. Why it still doesn't work?

Solution

Short Answer

Long Answer

# The current .NET SDK does not support targeting .NET Standard 2.0 error in Visual Studio 2017 update 15.3

The above stackoverflow url has an answer which suggests to install .NET SDK from the following link (resolve the issue but don't know why): # Download .NET SDKs for Visual Studio

Compare the SDK download url with the offical .NET Core SDK site: # Download .NET Core 2.2, you will find that they are the same: 

https://dotnet.microsoft.com/download/dotnet-core/thank-you/sdk-2.2.110-windows-x64-installer

Looks magic, right? So I guess the reason is that Visual Studio 2017 is only compatible with a specific version of .NET Core SDK, regardless which version your project actually used. Fortunately the first site provides a compatible SDK version list for different VS versions, install from that site would resolve the problem.