Unable to compile .net 6.0 projects in VS 2022

Question

Unable to compile .net 6.0 projects in VS 2022

Datta Kulkarni 21 Microsoft Employee

I am unable to compile .net 6.0 projects in VS 2022 (version 17.4.3). I see error message that - MSB3971 The reference assemblies for ".NETFramework,Version=v6.0" were not found. You might be using an older .NET SDK to target .NET 5.0 or higher.

I installed and checked that .net6 exists as you can see below the output of dotnet --list-sdk. Also checked that there is no global.json file anywhere in the system. Since I was unable to build project which was already converted to net6.0, I created a new console project in VS 2022 and ran into same error. While creating new project I got the option to select .net 6.0 but once created I started getting the same MSB3971 error.

dotnet --list-sdks
3. 1.300 [C:\Users\dkulkarn\AppData\Local\Microsoft\dotnet\sdk]
3. 1.426 [C:\Program Files\dotnet\sdk]
3. 1.426 [C:\Program Files\dotnet\sdk]
5. 0.415 [C:\Program Files\dotnet\sdk]
5. 0.415 [C:\Program Files\dotnet\sdk]
6. 0.112 [C:\Program Files\dotnet\sdk]
6. 0.112 [C:\Program Files\dotnet\sdk]
6. 0.307 [C:\Program Files\dotnet\sdk]
6. 0.307 [C:\Program Files\dotnet\sdk]
7. 0.101 [C:\Program Files\dotnet\sdk]
7. 0.101 [C:\Program Files\dotnet\sdk]

I also noticed that .net 6 is not present in target framework list which is shown within project properties.

Answer 1

Michael Taylor 40,926

Firstly, there is a known issue where the RTM release of the .NET 7 SDK which ships with VS 2022 can stomp the .NET 6 SDK. You can refer to some help here but ultimately repairing the .NET 6 SDK seems to resolve it IIRC.

The second thing is that VS 2022 is x64 whereas previous versions of VS where x86. The SDKs are installed as both x86 and x64. The version of MSBuild running in VS 2022 is x64 so you need to ensure you have the x64 version of the SDK installed as well.

Your post seems to have conflicting reports of the .NET 6 availability.

While creating new project I got the option to select .net 6.0
I also noticed that .net 6 is not present in target framework list which is shown within project properties

So I'm confused here. When you create a new project you should see the options of .NET 6 and .NET 7. However be aware not every project type supports both frameworks. If you open an existing .NET Core/5/6/7 project then you should see the option for .NET 6. However you will not see this option for .NET Framework projects as they only go up to .NET 4.8. To convert a .NET Framework app to .NET 6 you'll need to convert the project to the SDK project format first and then you can set the target framework. The UI (outside a helper extension) doesn't support this.

Datta Kulkarni 21 Reputation points Microsoft Employee

2023-01-03T18:38:48.94+00:00

I tried repairing .net6 but did not work. Also, the link shared above doesn't show the issue that I am facing.

I see that SDK for x64 us installed.

Following 3 screenshots show the creation of new console project with .Net 6. While creating it allows to select the .net6 (2nd screenshot), but once created dont see .net6 in target framework and also throws build error.
Michael Taylor 40,926 Reputation points

2023-01-03T19:06:59.957+00:00

The list of target frameworks is for .NET Framework, not .NET Core which is where .NET 6/7 resides. If this is the project you literally just created then something is seriously wrong as you're seeing the wrong list of platforms. Can you show us the content of your .csproj file?
Datta Kulkarni 21 Reputation points Microsoft Employee

2023-01-03T19:09:39.31+00:00

You are right, this is the project that I just created. Here is the csproj file content.
Michael Taylor 40,926 Reputation points

2023-01-03T19:15:00.597+00:00

Just to confirm but when you installed VS you opted into installing the .NET Core workloads right? Run the installer and go to Individual Components, then verify .NET 6.0 Runtime is checked.
Datta Kulkarni 21 Reputation points Microsoft Employee

2023-01-03T19:17:37.123+00:00

Hey Yes I see that it is checked.
Michael Taylor 40,926 Reputation points

2023-01-03T19:33:29.287+00:00

Hmm. You already said you didn't have a global.json file anywhere which is the next thing to look at. Let's check the path variable then. Look at your PATH environment variable. Make sure that C:\program Files\dotnet is higher in the path list than any other version.
Datta Kulkarni 21 Reputation points Microsoft Employee

2023-01-03T20:35:27.097+00:00

This helped, there was another dotnet path above C:\program Files\dotnet . I moved C:\program Files\dotnet up and that helped solve the problem. Thanks!

Unable to compile .net 6.0 projects in VS 2022

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