The purpose of this book is to give readers a broad understanding of patterns in modern software development while diving into more detail with specific examples. The number of patterns used when developing solutions is vast, and often, developers use patterns without knowing they are doing so. This book covers patterns from low-level code, to high-level concepts used in solutions that run in the cloud.

Though many of the patterns presented do not require a specific language, C# and .NET Core will be used to illustrate examples for many of them. C# and .NET Core were chosen due to their popularity and design, which supports building solutions from simple console applications to large-enterprise distributed systems.

Covering a large number of patterns, the book serves as a great introduction to many of them, while allowing a deeper, hands-on approach to a selected collection. The specific patterns covered have been selected as they illustrate a specific point or aspect of patterns. References to additional resources are provided to allow the reader to dive deeper into patterns of particular interest.

From simple websites to large-enterprise distributed systems, the right pattern can make the difference between a successful, long-lived solution and a solution viewed as a failure due to its poor performance and high cost. This book covers many patterns that can be applied to build solutions that handle the inevitable change required to stay competitive in business, as well as achieve the robustness and reliability expected of modern applications.