Summary

In this chapter, you took an in-depth look at delegates. You created custom delegates and saw how they could be replaced with their modern counterparts, the inbuilt Action and Func delegates. By using null reference checks, you discovered the safe way to invoke delegates and how multiple methods can be chained together to form multicast delegates. You extended delegates further to use them with the event keyword to restrict invocation and followed the preferred pattern when defining and invoking events. Finally, you covered the succinct lambda expression style and saw how bugs can be avoided by recognising the use of captures and closures.

In the next chapter, you will look at LINQ and data structures, the fundamental parts of the C# language.