How to use existing .net framework 4.8 class library in .NET 6 project?

Question

We have .NET 6 Blazor Server-side project in Visual Studio 2022. We would like to use .Net Framework 4.8 class library in .NET 6. In this class library, we are using System.Windows.Form and we cannot recompile the class library with .NET Standard 2.0.

I have added .Net Framework 4.8 class library project as dependency for Blazor Application. I am able to compile the solution but when try to run the Blazor Application then it complaints with "System.IO.FileNotFoundException: 'Could not load file or assembly 'System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.".

We would just like to run Blazor project in windows only.

Answer 1

You can not use your .NET Framework 4.8 project with your .NET Core 6 project.

Second opinion https://stackoverflow.com/questions/70923650/how-can-i-use-existing-net-framework-4-8-class-library-in-net-6-project

Regarding compatibility mode if going this route make sure to test current code and look-ahead and what may come down the road.

In closing, every single one of my Framework 4.8 project were rewritten for .NET Core, didn't want to chance anything along with wanting better performance.

Answer 2

See the NET Framework compatibility mode

Answer 3

Read answers from this thread : can-i-add-a-reference-to-a-net-framework-dll-from-a-net-6-project