Problems with VS community 2019

Question

Hello,

To free up space, I've deleted older versions of Visual Studio (even 2010 was still installed).
In the process of removing the applications, there must have been left something behind, or deleted something too much.

After the removal, I've installed the latest community edition of Visual Studio 2019.

But it doesn't behave as expected.

When I create a new project, it looks as if it behaves coorectly.

It has created a solution and a project
The file structure seems to be OK.
But the project has not been added to the solution.

If I try to manually add the project to the solution with the Add existing project option, it gives an error.
"The project file cannot be opened. Unable to locate the .NET Core SDK. Check that it is installed and that the version specified in the global.json (if any) matches the installed version."

I've deleted all other versions of Visual Studio and .Net Framework and Core versions

Any ideas how to solve this, or where to look first?

Answer 1

Hello Developron,

Thank you for taking time to post this issue in Microsoft Q&A forum.

But the project has not been added to the solution.

Did you select this option Place solution and project in the same directory when created a new project(solution)?

If I try to manually add the project to the solution with the Add existing project option, it gives an error.

From your description, it seems this issue is caused by deleting some old installed versions of .NET Core SDK. Please type dotnet –list-sdks in Command Prompt to display and check the installed SDKs. You may need to install some old versions of .NET Core SDKs, for example, version 2.2.402.

Besides, please check the system variables of Environment Variables, and make sure that the value C:\Program Files\dotnet is added for variable DOTNET(right-click This PC > Properties > Advanced system settings > Environment Variables… > System variables).

By the way, did you install .NET Core SDK from VS Installer > VS 2019 Community > Modify > Individual Components > .NET Core SDK?

Sincerely,
Tianyu

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Answer 2

Hello Tianyu,

I've (double) checked everything you suggested.

I've added the DOTNET variable to both sections.
And installed the 2.2.402 SDK.

When I run dotnet --info, I get the following information :

It was not possible to find any installed .NET Core SDKs
Did you mean to run .NET Core SDK commands? Install a .NET Core SDK from:
https://aka.ms/dotnet-download

Host (useful for support):
Version: 3.1.9
Commit: 774fc3d6a9

.NET Core SDKs installed:
No SDKs were found.

.NET Core runtimes installed:
Microsoft.AspNetCore.App 3.1.8 [C:\Program Files (x86)\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.9 [C:\Program Files (x86)\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 3.1.8 [C:\Program Files (x86)\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.9 [C:\Program Files (x86)\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 3.1.9 [C:\Program Files (x86)\dotnet\shared\Microsoft.WindowsDesktop.App]

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

When I create a new solution, the .sln file lacks the following :

The
Project-EndProject
section,
and the
GlobalSection(SolutionConfigurationPlatforms) = preSolution
GlobalSection(ProjectConfigurationPlatforms) = postSolution
sections

Answer 3

I am having this same problem on my laptop. Nothing above has helped.