A comprehensive guide to the State design pattern in C#, covering core components (State interface, Concrete States, Context), a full order-processing implementation with five states (Pending, Confirmed, Shipped, Delivered, Cancelled), and the connection to finite state machines. Also compares State vs Strategy pattern, discusses combining with Observer and Command patterns, and weighs benefits (eliminates conditionals, OCP/SRP compliance, testability) against drawbacks (class proliferation, tight coupling between states).
Table of contents
What Is the State Design Pattern?Core Components of the State Design PatternImplementing the State Pattern in C#State Transitions and Finite State MachinesState Pattern vs. Strategy PatternCombining with Other PatternsBenefits and DrawbacksFrequently Asked QuestionsWrapping Up the State Design Pattern in C#Sort: