CommandDesignPattern

Overview

This project aims to demonstrate the Command design pattern in C#. The Command design pattern is a behavioral design pattern that focuses on encapsulating a request as an object, thereby allowing for the parameterization of clients with queues, requests, and operations. It transforms a request into a standalone object with its own class, containing necessary information about the request, and can be passed around and executed independently from the sender and the receiver.

Remote Control Car

The example we're using to demonstrate the Command Design Pattern is that of a remote-controlled car. It emulates the operation of a remote control car in action. This real-world scenario is used to showcase how the Command Pattern effectively decouples the sender (the remote control) from the receiver (the car) and encapsulates various actions as command objects.

Components Involved

• Command : Declares an interface for executing an operation. ICommand is used here as the interface.
• Receiver : Carries out the actual operations associated with performing the request. Car is our Receiver object here. It contains methods like MoveForward(), MoveLeft(), MoveRight(), and Stop(), which define how the car behaves in response to commands.
• ConcreteCommand : Defines a binding between the Receiver object and a corresponding action. It implements the Execute() function by invoking the corresponding operation(s) on Receiver. The classes in the Actions directory are our ConcreteCommand classes.
• Invoker : The RemoteControl class is our invoker here. It contains switches that correspond to different commands that can be set. When clicked, RemoteControl invokes the corresponding command without knowing the details of how the command is executed.

Class diagram

Environment

The project builds and runs with Visual Studio Community 2022.