Microsoft.Data.SqlClient is not supported on this platform

Issue Description

I have an ASP.NET Core MVC project targeting .NET 7 and a library project also targeting .NET 7. After referencing the library project in the MVC project and publishing it, I receive the following error when trying to use the DbContext:

System.PlatformNotSupportedException: Microsoft.Data.SqlClient is not supported on this platform.

Expected Behavior

I expected to be able to use the DbContext without any issues after referencing the .NET 7 library project.

Steps to Reproduce

1. Create a new ASP.NET Core MVC project targeting .NET 7.
2. Create a new class library project targeting .NET 7.
3. Add a database context to the class library project using Microsoft.EntityFrameworkCore.SqlServer package.
4. Add a reference to the class library project in the MVC project.
5. Publish the MVC project and attempt to use the database context.

Additional Information

• I have tried the solutions suggested in Microsoft’s documentation.
• I have also tried downgrading the class library project to target .NET 6 and that resolved the issue. However, I need to target .NET 7 for other reasons.
• This is a severe issue as it prevents me from using a library project that targets .NET 7 and Microsoft.Data.SqlClient.
• This issue did not occur when using .NET 6 in both projects.