public CourseAppService(CourseManager courseManager, CourseToCourseCategoryManager courseToCourseCategoryManager, CourseCategoryManager courseCategoryManager, UserManager userManager, IEnumExtensionsAppService enumExtensionsAppService)
 {
     _courseManager = courseManager;
     _courseToCourseCategoryManager = courseToCourseCategoryManager;
     _courseCategoryManager         = courseCategoryManager;
     _userManager = userManager;
     _enumExtensionsAppService = enumExtensionsAppService;
 }
 /// <summary>
 ///     CourseCategory的构造方法
 ///     通过构造函数注册服务到依赖注入容器中
 /// </summary>
 public CourseCategoryManager(IRepository <CourseCategory, long> courseCategoryRepository, CourseToCourseCategoryManager courseToCourseCategoryManager)
     : base(courseCategoryRepository)
 {
     _courseToCourseCategoryManager = courseToCourseCategoryManager;
 }
 public CourseCategoryAppService(ICourseCategoryManager categoryManager, CourseManager courseManager, CourseToCourseCategoryManager courseToCourseCategoryManager)
 {
     _categoryManager = categoryManager;
     _courseManager   = courseManager;
     _courseToCourseCategoryManager = courseToCourseCategoryManager;
 }