.net-standard-2.1 – Tarik Billa

Project ‘ClassLibrary1.csproj’ targets ‘netstandard2.1’. It cannot be referenced by a project that targets ‘.NETFramework,Version=v4.8’

September 1, 2023 by Tarik

What can I do? If your library doesn’t need the very latest features, use .net standard 2.0 in general, a library should aim to support the lowest possible version. or port your WPF app to .NET Core 3 or later

‘Could not load type ‘Microsoft.AspNetCore.Mvc.MvcJsonOptions’ from assembly ‘Microsoft.AspNetCore.Mvc.Formatters.Json, Version=3.0.0.0

May 14, 2023 by Tarik

I’m not sure if this solves OP’s problem, but this error also occurs when you use Swashbuckle 4 in .Net Core 3. The solution is to use Swashbuckle 5. (use command install-package Swashbuckle.AspNetCore) to have in .csproj <PackageReference Include=”Swashbuckle.AspNetCore” Version=”5.0.0″ /> Then you’ll need to upgrade it in Startup.cs. Generally that involves prefixing classes that … Read more