Design Patterns in .NET Core 3: Reusable Approaches in C# and F# for Object-Oriented Software Design

Good software design is not just about choosing a familiar pattern; it is about understanding when a pattern fits, how a language shapes its implementation, and what trade-offs follow. In Design Patterns Core 3, Dmitri Nesteruk explores those questions through examples in both C# and F#.

This second edition connects established object-oriented techniques with the capabilities of Core 3 environment, giving programmers a practical way to study reusable approaches to software design.

Start with the principles behind the patterns

Before turning to pattern catalogs, the book introduces SOLID design principles and a functional perspective. That grounding helps put individual techniques in context: readers can consider not only how to implement a pattern, but why a particular approach may suit a design problem.

From object creation to system structure

The coverage moves through creational, structural, and behavioral patterns. Topics include Builder, Factory, Prototype, Singleton, Adapter, Bridge, Composite, Decorator, Proxy, Command, Observer, State, Strategy, Template Method, and Visitor. The contents also point to related techniques such as asynchronous factories, dependency injection, command-query separation, and state transitions.

Compare C# and F# approaches

Using two languages gives the discussion a useful comparative angle. Readers can see how object-oriented patterns are expressed in C# and F#, and how functional ideas and language features can offer alternative ways to shape a solution.

A practical reference programmers

This book is suited to developers who already work with C# or F# and want to deepen their understanding of reusable design approaches. It can support focused study of a particular pattern, or serve as a broader reference when considering how to organize object-oriented software Core 3.