The goal of this chapter was to explore the .Net Core framework in more detail, and, in particular, the .Net Core DI. Three types of service lifetimes are supported: Transient, Scoped, and Singleton. A Transient service will create a new instance of a registered dependency for each request. A Scoped service will be generated once with a defined scope, while a Singleton service will be performed once for the lifetime of the DI service collection. 

As the .Net Core DI is central to confidently building .Net Core applications, it is important to understand its capabilities and its limitations. It is important to use the DI effectively, as well as to avoid duplicating functionality that is already supplied. Just as crucial, it is also wise to know the limits of the .Net Core DI framework, as well as the strengths of other DI frameworks, for situations where replacing the basic .Net Core DI framework with a third-party DI framework could be beneficial for an application.

The next chapter will build upon the previous chapters and explore, common patterns in .Net Core ASP.Net web applications.