Design Patterns in C# and .NET – Complete Modern Masterclass (SOLID, GoF Patterns)

Writing clean, scalable, and maintainable C# and .NET applications requires more than just knowing the syntax. You need to understand Design Patterns and SOLID principles as they are applied in real-world, modern .NET development. This comprehensive masterclass teaches all Gang of Four (GoF) design patterns using the latest versions of C# and .NET, with live coding demonstrations and practical exercises.

What You’ll Learn in This C# Design Patterns Course

• Recognize and apply design patterns in real C# and .NET applications.
• Understand and apply SOLID design principles correctly.
• Refactor existing code to use proper design patterns.
• Reason about when and why to use a specific pattern.
• Implement patterns using modern C# features and .NET tooling.
• Use dependency injection, reactive programming, and modern approaches.
• Communicate confidently with senior developers using correct pattern terminology.

Who This Course Is For

• .NET and C# developers who want to master design patterns.
• Beginner developers who want a strong architectural foundation.
• Experienced developers looking for modern pattern implementations.
• Anyone interested in writing clean, maintainable, and testable code.

What Are Design Patterns?

Design Patterns are reusable solutions to common software design problems. They were popularized by the famous book Design Patterns: Elements of Reusable Object-Oriented Software by the Gang of Four (GoF). Today, these patterns are deeply embedded in modern languages like C# and frameworks like .NET, often appearing in libraries and frameworks you already use.

Design Patterns Covered in This Course

SOLID Design Principles

• Single Responsibility Principle (SRP)
• Open–Closed Principle (OCP)
• Liskov Substitution Principle (LSP)
• Interface Segregation Principle (ISP)
• Dependency Inversion Principle (DIP)

Creational Design Patterns

• Builder (Fluent, Stepwise, Functional)
• Factory Method & Abstract Factory
• Prototype
• Singleton (Monostate, Per-thread, DI-based)

Structural Design Patterns

• Adapter
• Bridge
• Composite
• Decorator
• Façade
• Flyweight
• Proxy

Behavioral Design Patterns

• Chain of Responsibility
• Command
• Interpreter
• Iterator
• Mediator
• Memento
• Null Object
• Observer
• State
• Strategy
• Template Method
• Visitor

Modern C# and .NET Approach

Unlike textbook courses, this training focuses on modern implementations. You’ll see how patterns work with dependency injection, reactive programming, DLR, and modern tooling like Visual Studio, Rider, and ReSharper. Many patterns are shown in multiple variations so you understand their trade-offs.

Requirements

• Good understanding of C#.
• Familiarity with modern C# language features.
• Basic knowledge of object-oriented programming.

FAQ

Is this course suitable for beginners?

Yes. Beginners can follow along, but having basic C# and OOP knowledge will help you get the most value from the course.

Does this course cover all GoF design patterns?

Yes. All Gang of Four design patterns are covered, including creational, structural, and behavioral patterns.

Is this a theory-based course?