public HelloWorldDataService(
     IAppSettings appSettings,
     IFileIOService fileIOService,
     IHelloWorldMapper helloWorldMapper)
 {
     this.appSettings      = appSettings;
     this.fileIOService    = fileIOService;
     this.helloWorldMapper = helloWorldMapper;
 }
 /// <summary>
 ///     Initializes a new instance of the <see cref="HelloWorldDataService" /> class.
 /// </summary>
 /// <param name="appSettings">The injected application settings service</param>
 /// <param name="dateTimeWrapper">The injected DateTime wrapper</param>
 /// <param name="fileIOService">The injected File IO Service</param>
 /// <param name="helloWorldMapper">The injected Hello World Mapper</param>
 public HelloWorldDataService(
     IAppSettings appSettings,
     IDateTime dateTimeWrapper,
     IFileIOService fileIOService,
     IHelloWorldMapper helloWorldMapper)
 {
     this.appSettings = appSettings;
     this.dateTimeWrapper = dateTimeWrapper;
     this.fileIOService = fileIOService;
     this.helloWorldMapper = helloWorldMapper;
 }