using System; using System.Collections.ObjectModel; using System.ComponentModel; using SchoolSample.EntityModel; namespace SchoolSample.Common { public interface ISchoolModel : INotifyPropertyChanged { // Data Retrieval: void GetStudentsAsync(string includeOption, string screenName); event EventHandler<ResultsArgs<Student>> GetStudentsCompleted; void GetStudentByIdAsync(int studentId); event EventHandler<ResultArgs<Student>> GetStudentByIdCompleted; void GetInstructorsAsync(string includeOption, string screenName); event EventHandler<ResultsArgs<Instructor>> GetInstructorsCompleted; void GetInstructorByIdAsync(int instructorId); event EventHandler<ResultArgs<Instructor>> GetInstructorByIdCompleted; void GetCoursesAsync(string screenName); event EventHandler<ResultsArgs<Course>> GetCoursesCompleted; void GetCourseByIdAsync(int courseId); event EventHandler<ResultArgs<Course>> GetCourseByIdCompleted; // Data Cache: ObservableCollection<Student> StudentsList { get; set; } Student CurrentStudent { get; set; } ObservableCollection<Instructor> InstructorsList { get; set; } Instructor CurrentInstructor { get; set; } ObservableCollection<Course> CoursesList { get; set; } Course CurrentCourse { get; set; } // Data Status: Boolean StudentsListHasChanges { get; } Boolean CurrentStudentHasChanges { get; } Boolean InstructorsListHasChanges { get; } Boolean CurrentInstructorHasChanges { get; } Boolean CoursesListHasChanges { get; } Boolean CurrentCourseHasChanges { get; } Boolean IsBusy { get; } // Update and Rollback of Entity List: void SaveStudentChangesAsync(bool allItems = true); event EventHandler<ResultArgs<string>> SaveStudentChangesCompleted; void RejectStudentChanges(bool allItems = true); void SaveInstructorChangesAsync(bool allItems = true); event EventHandler<ResultArgs<string>> SaveInstructorChangesCompleted; void RejectInstructorChanges(bool allItems = true); void SaveCourseChangesAsync(bool allItems = true); event EventHandler<ResultArgs<string>> SaveCourseChangesCompleted; void RejectCourseChanges(bool allItems = true); // Error Handling: Exception GetLastError(); void ClearLastError(); Boolean AllowMultipleErrors { get; set; } } }
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