Microsoft.Extensions.Primitives contains isolated types that are used in many places within console or ASP.NET Core applications using framework extensions.
Commonly Used Types:
- Microsoft.Extensions.Primitives.IChangeToken
- Microsoft.Extensions.Primitives.StringValues
- Microsoft.Extensions.Primitives.StringSegment
The APIs and functionality are mature, but do get extended occasionally.
Microsoft.Extensions.Primitives is included in the ASP.NET Core shared framework. The package is deployed as out-of-band (OOB) too and can be referenced into projects directly.