Summary
In this module, you learned about the role and implementation of delegates in C#. Delegates, derived from the Delegate class, are used for late binding and encapsulating methods. Delegate objects can be stored in variables, passed as arguments, and invoked later. Delegates are type-safe and can be used for dynamic method invocation, callback methods, type safety, and multicast invocation. You also learned about the declaration, instantiation, and invocation of delegates using named methods, method group conversion, anonymous methods, or lambda expressions. The module also covered the use of delegates in scenarios such as sorting and filtering, callback methods, asynchronous programming, event handling, and implementing design patterns.
The main takeaways from this module include your understanding of how delegates enhance code flexibility and reusability by encapsulating methods and passing them as parameters. You learned about the use of strongly typed delegates like Action and Func that simplify code, improve readability, and enhance maintainability. The module also introduced the concept of variance in C#, which enhances flexibility in method signatures with delegates, allowing methods to be assigned to delegates even if their parameter types or return types aren't identical. You also learned about the practical application of these concepts through an exercise involving the implementation of delegates in a C# app.