Hands-On Design Patterns with C# and .NET Core

CatalogService

The CatalogService interface represents the console application the team is building and is described as having a single Run method, as shown in the ICatalogService interface:

interface ICatalogService{    void Run();}

The service has two dependencies, IUserInterface and IInventoryCommandFactory, and they will be injected into the constructor and stored as local variables:

public class CatalogService : ICatalogService{    private readonly IUserInterface _userInterface;    private readonly IInventoryCommandFactory _commandFactory;    public CatalogService(IUserInterface userInterface, IInventoryCommandFactory commandFactory)    {        _userInterface = userInterface;        _commandFactory = commandFactory;    }    ...}

The Run method is based on the earlier ...