C# Design Patterns: Part 2

Learn how to recognize and implement design patterns in C# to save time and improve application designs.

Introduction

• Object-oriented design patterns in C#, part 2
• Using the exercise files and installing .NET SDK

1. Observer

• Observer pattern definition
• Simple event delegate observer implementation in C#
• Using INotifyPropertyChanged to observe model changes in C#
• Challenge: Replace a direct call with the Observer pattern
• Solution: Replace a direct call with the Observer pattern

2. Builder

• Builder pattern definition
• Simple builder implementation in C#
• Explore the ApplicationBuilder pattern being used in an enterprise MVC application
• Implement the Builder pattern in an MVC application
• Challenge: Fluent order builder
• Solution: Fluent order builder

3. Command

• Command pattern definition
• Simple Command pattern implementation in C#
• Implement a data update command in a C# MVC application
• Challenge: Undo with the Command pattern
• Solution: Undo with the Command pattern

4. Proxy

• Proxy pattern definition
• Simple proxy file access in C#
• Caching data service proxy with MVC in C#
• Challenge: Proxy Facade
• Solution: Proxy Facade

5. Chain of Responsibility

• Chain of Responsibility pattern definition
• Simple Chain of Responsibility exception handling in C#
• ASP.NET Core request pipeline as a Chain of Responsibility
• Add a filter to the ASP.NET core Chain of Responsibility
• Challenge: Chain of Responsibility grocery list
• Solution: Chain of Responsibility grocery list

Conclusion

• Next steps