refer :

https://docs.microsoft.com/en-us/dotnet/core/tutorials/library-with-visual-studio

https://docs.microsoft.com/en-us/dotnet/core/tutorials/consuming-library-with-visual-studio?tabs=csharp

https://docs.microsoft.com/en-us/dotnet/core/tools/dotnet-pack?tabs=netcore2x

https://docs.microsoft.com/en-us/nuget/hosting-packages/overview

开一个项目, 创建 library -> 写 code -> build

另一个项目, add reference 指向 library dll 就可以调用了.

要发布的话使用 dotnet cmd

dotnet pack --configuration release -p:PackageVersion=1.0.0-beta

然后发布到 nuget, 如果要私有的话，要自己架构 nuget server.