Package Manager Console Error with Multiple Startup Projects

[SoftCircuits]

I recent upgraded all the projects in my solution from .NET 5.0 to .NET 6.0.

The solutions builds and runs without error.

But when I attempt to add a migration, I get an error.

It was not possible to find any compatible framework version

The framework 'Microsoft.NETCore.App', version '2.0.0' (x64) was not found.

• The following frameworks were found:
  5.0.12 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  6.0.0 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]

You can resolve the problem by installing the specified framework and/or SDK.

The specified framework can be found at:

• https://aka.ms/dotnet-core-applaunch?framework=Microsoft.NETCore.App&framework_version=2.0.0&arch=x64&rid=win10-x64

The problem, as it turns out, is that I have two projects set as the Startup Project: A client application and Web API application. If I set only the client application as the Startup Project, then the migration adds without error.

So I'm able to move forward but I do not understand the original error. Why is it looking for version 2 of Microsoft.NETCore.App? And why did upgrading to .NET 6.0 make this version no longer available? Is this a bug?

Include provider and version information

EF Core version:
Database provider: Microsoft.EntityFrameworkCore.SqlServer
Target framework: .NET 6.0
Operating system: Windows 10
IDE: Visual Studio 2022 17.0.1

[ajcvickers]

/cc @bricelam

[DavidDury]

I am facing similar issue except I am able to add new migration, update database and so on. What I am trying to do is generate a sql script for a migration.

• multiple projects setup
• migrations is in separate project.

PS C:\Users\dev\Desktop\web-solution\src> dotnet ef migrations script 0 Initial -c ApplicationDbContext -p ./Migrations/Migrations.csproj -o ./Migrations/Application/Scripts
Build started...
Build succeeded.
It was not possible to find any compatible framework version
The framework 'Microsoft.NETCore.App', version '2.0.0' (x64) was not found.

• The following frameworks were found:
  6.0.1 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]

You can resolve the problem by installing the specified framework and/or SDK.

The specified framework can be found at:

• https://aka.ms/dotnet-core-applaunch?framework=Microsoft.NETCore.App&framework_version=2.0.0&arch=x64&rid=win10-x64

• Windows 11

• VS 2022 17.0.4

C:\Program Files\Microsoft Visual Studio\2022\Enterprise>dotnet sdk check
.NET SDKs:
Version Status

6.0.101 Up to date.

.NET Runtimes:
Name Version Status

Microsoft.AspNetCore.App 6.0.1 Up to date.
Microsoft.NETCore.App 6.0.1 Up to date.
Microsoft.WindowsDesktop.App 6.0.1 Up to date.

The latest versions of .NET can be installed from https://aka.ms/dotnet-core-download. For more information about .NET lifecycles, see https://aka.ms/dotnet-core-support.

[alfkonee]

I'm also facing the same issue as @DavidDury but I can't even add the migrations

  Tech231.SportPlus.Infrastructure   master ↓1  +1   6.0.101    dotnet ef migrations add AddGuidDefaults
Build started...
Build succeeded.
It was not possible to find any compatible framework version
The framework 'Microsoft.NETCore.App', version '2.0.0' (x64) was not found.
  - The following frameworks were found:
      3.1.15 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
      3.1.21 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
      5.0.12 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
      5.0.13 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
      6.0.0-rc.1.21451.13 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
      6.0.0 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
      6.0.1 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]

You can resolve the problem by installing the specified framework and/or SDK.

The specified framework can be found at:
  - https://aka.ms/dotnet-core-applaunch?framework=Microsoft.NETCore.App&framework_version=2.0.0&arch=x64&rid=win10-x64

[alfkonee]

From FairyFox5700/Disaster-Tracker-App#2 I found that installing Microsoft.EntityFrameworkCore.Design Nuget in the Class LIB Project Fixed it
dotnet add package Microsoft.EntityFrameworkCore.Design

[bricelam]

I suspect you'll get a better error after PR #27671