...

Download the Visual Studio solution of this example, with an already built, ready-to-run plugin assembly: CSiNET8PluginExample1.zip

For developers who need to use .NET Framework 4.7.1 - 4.8.1 , an example .NET Framework 4.8 project is provided here: CSiFramework48PluginExample2.zip

References

https://learn.microsoft.com/en-us/dotnet/core/tutorials/creating-app-with-plugin-support#simple-plugin-with-no-dependencies

...