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I have a problem with VS Code .net 5 settings.

Error MSB3971: The reference assemblies for ".NETFramework,Version=v5.0" were not found. You might be using an older .NET SDK to target .NET 5.0 or higher. Update Visual Studio and/or your .NET SDK.

Some time ago I was using .net core 3 recently I wanted to move to the newest version.

1. I have installed the latest version of the SDK -> https://dotnet.microsoft.com/download/dotnet/5.0
2. I updated VS Code to the latest version
3. I started a brand new project in .net 5

I was looking for a solution to my problem on the internet, but nothing works.

Powershell dotnet version:

dotnet --version
5.0.401

dotnet --info   
Zestaw .NET SDK (odzwierciedlenie dowolnego pliku global.json):
 Version:   5.0.401
 Commit:    4bef5f3dbf

Środowisko uruchomieniowe:
 OS Name:     Windows
 OS Version:  10.0.19043
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\5.0.401\

Host (useful for support):
  Version: 5.0.10
  Commit:  e1825b4928

.NET SDKs installed:
  2.1.700 [C:\Program Files\dotnet\sdk]
  2.1.801 [C:\Program Files\dotnet\sdk]
  2.2.202 [C:\Program Files\dotnet\sdk]
  5.0.401 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.All 2.1.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.12 [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 2.1.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.2.3 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.10 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.2.3 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.10 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 5.0.10 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

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

Visual Studio Code Version:

version: 1.60.2

Info about Visual Studio Code

The contents of the project.csproj file

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

  <PropertyGroup>
    <TargetFramework>net5.0</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Swashbuckle.AspNetCore" Version="5.6.3" />
  </ItemGroup>

</Project>

I have the latest SDK and VS Code, I don't know what else I can do to make it work.

I uninstall all versions of .net and install only 5.0. Now i have new error

error MSB4236: The SDK 'Microsoft.NET.Sdk.Web' specified could not be found.

After I reinstall .NET I got this from terminal:

dotnet --info
Zestaw .NET SDK (odzwierciedlenie dowolnego pliku global.json):
 Version:   5.0.401
 Commit:    4bef5f3dbf

Środowisko uruchomieniowe:
 OS Name:     Windows
 OS Version:  10.0.19043
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\5.0.401\

Host (useful for support):
  Version: 5.0.10
  Commit:  e1825b4928

.NET SDKs installed:
  5.0.401 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 5.0.10 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 5.0.10 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 5.0.10 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

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

Answers

I struggled with this problem for a long time. Here is a list of things that need to be checked.

1. Remove all SDKs from your computer. - Find in the control panel "Programs and Features" then delete all Microsoft .NET Runtime - x.x.xx, Microsoft .NET SDK x.x.x

2. Install newest .NET SDK and Runtime - i use this site

3. Check your PATH - Check if the path with the environment variables in windows contains C:\Program Files\dotnet

4. !! Check MSBuildSDKsPath Environment Variable - It turned out that installing the new SDK does not change the information in the environment paths. I still had the old version listed there and after uninstalling everything, I got a message saying that 'Microsoft.NET.Sdk.Web' could not be found.

   Check the value of the MSBuildSDKsPath variable. The proper value for me was x C:\Program Files\dotnet\sdk\5.0.401\Sdks