static void Main(string[] args)
{
BusinessLayer BL = new BusinessLayer();
int choice, option, id;
string answer;
bool exit = false;
Teacher teach = new Teacher();
Course course = new Course();
Console.WriteLine("Repository Application Menu");
while (exit == false)
{
Console.WriteLine("\n1. Add a Teacher\n" +
"2. Update a Teacher\n" +
"3. Delete a Teacher\n" +
"4. Courses taught by Teacher(input ID)\n" +
"5. Display all Teachers\n\n" +
"6. Add a Course\n" +
"7. Update a Course\n" +
"8. Delete a Course\n" +
"9. Display all Courses\n" +
"0. Exit\n");
choice = Convert.ToInt32(Console.ReadLine());
try
{
switch (choice)
{
case 0: //exit
exit = true;
break;
case 1: //add teach
Console.WriteLine("add a Teacher's name: ");
teach.TeacherName = Console.ReadLine();
BL.AddTeacher(teach);
break;
case 2: //update teach
Console.WriteLine("Search by:\n1. ID\n2. name");
option = Convert.ToInt32(Console.ReadLine());
if (option == 1) //search by ID
{
Console.WriteLine("Enter ID: ");
id = Convert.ToInt32(Console.ReadLine());
teach = BL.GetTeacherByID(id);
}
else if (option == 2) //search by name
{
Console.WriteLine("Enter Name: ");
string name = Console.ReadLine();
teach = BL.GetTeacherByName(name);
}
Console.WriteLine("Current name: {0} with id: {1}", teach.TeacherName, teach.TeacherId);
Console.WriteLine("Change name: ");
teach.TeacherName = Console.ReadLine();
BL.UpdateTeacher(teach);
break;
case 3: //delete teach
Console.WriteLine("Search by:\n1. ID\n2. name");
option = Convert.ToInt32(Console.ReadLine());
if (option == 1) //search by ID
{
Console.WriteLine("Enter ID: ");
id = Convert.ToInt32(Console.ReadLine());
teach = BL.GetTeacherByID(id);
}
else if (option == 2) //search by name
{
Console.WriteLine("Enter Name: ");
string name = Console.ReadLine();
teach = BL.GetTeacherByName(name);
}
Console.WriteLine("Current name: {0} with id: {1}", teach.TeacherName, teach.TeacherId);
Console.WriteLine("Delete this? (Y/N)");
while (exit == false) //confirm deletion
{
answer = Console.ReadLine();
if (answer == "y" || answer == "Y")
{
BL.RemoveTeacher(teach);
exit = true;
}
else if (answer == "n" || answer == "N")
{
exit = true;
}
else
{
Console.WriteLine("only y or n");
}
}
exit = false;
break;
case 4: //courses taught by teacher
BL.GetAllCourse();
Console.WriteLine("Enter a teacher ID: ");
id = Convert.ToInt32(Console.ReadLine());
teach = BL.GetTeacherByID(id);
Console.WriteLine("Teacher name: {0}\nCourse(s) teaching:\n", teach.TeacherName);
foreach (Course c in teach.Courses)
{
Console.WriteLine(c.CourseName);
}
break;
case 5: //all teachers
Console.WriteLine("{0}\t{1}", "Teacher Name", "Teacher ID");
Console.WriteLine("___________________________");
foreach (Teacher t in BL.GetAllTeacher())
{
Console.WriteLine("{0}\t{1}", t.TeacherName, t.TeacherId);
}
break;
case 6: //add course
Console.WriteLine("add a Course name: ");
course.CourseName = Console.ReadLine();
Console.WriteLine("Who teaches this course?(Enter ID)\n");
course.TeacherId = Convert.ToInt32(Console.ReadLine());
BL.AddCourse(course);
break;
case 7: //update course
Console.WriteLine("Search by:\n1. ID\n2. name");
option = Convert.ToInt32(Console.ReadLine());
if (option == 1) //search by ID
{
Console.WriteLine("Enter ID: ");
id = Convert.ToInt32(Console.ReadLine());
BL.GetCourseByID(id);;
}
else if (option == 2) //search by name
{
Console.WriteLine("Enter Name: ");
string name = Console.ReadLine();
BL.GetCourseByName(name);
}
Console.WriteLine("Current name: {0} with id: {1}", course.CourseName, course.CourseId);
Console.WriteLine("Change name: ");
course.CourseName = Console.ReadLine();
BL.UpdateCourse(course);
break;
case 8: //delete course
Console.WriteLine("Search by:\n1. ID\n2. name");
option = Convert.ToInt32(Console.ReadLine());
if (option == 1) //search by ID
{
Console.WriteLine("Enter ID: ");
id = Convert.ToInt32(Console.ReadLine());
course = BL.GetCourseByID(id);
}
else if (option == 2) //search by name
{
Console.WriteLine("Enter Name: ");
string name = Console.ReadLine();
course = BL.GetCourseByName(name);
}
Console.WriteLine("Current name: {0} with id: {1}", course.CourseName, course.CourseId);
Console.WriteLine("Delete this? (Y/N)");
while (exit == false) //confirm deletion
{
answer = Console.ReadLine();
if (answer == "y" || answer == "Y")
{
BL.RemoveCourse(course);
exit = true;
}
else if (answer == "n" || answer == "N")
{
exit = true;
}
else
{
Console.WriteLine("only y or n");
}
}
exit = false;
break;
case 9: //all courses
Console.WriteLine("{0}\t{1}", "Course Name", "Course ID");
Console.WriteLine("___________________________");
foreach (Course c in BL.GetAllCourse())
{
Console.WriteLine("{0}\t\t{1}", c.CourseName, c.CourseId);
}
break;
}
}
catch (Exception)
{
Console.WriteLine("Item does not exist");
}
}
Console.WriteLine("Press any key to continue . . .");
Console.ReadKey();
}
static void Main(string[] args)
{
BusinessLayer.BusinessLayer bl = new BusinessLayer.BusinessLayer();
bool run = true;
while (run)
{
Console.WriteLine("");
Console.WriteLine("----- Respository Program -----");
Console.WriteLine("[ Teacher ]");
Console.WriteLine("1. Add Teacher");
Console.WriteLine("2. Update Teacher");
Console.WriteLine("3. Remove Teacher");
Console.WriteLine("4. Display all courses associated with a Teacher ID");
Console.WriteLine("5. Display all teachers");
Console.WriteLine("");
Console.WriteLine("[ Course ]");
Console.WriteLine("6. Add Course");
Console.WriteLine("7. Update Course");
Console.WriteLine("8. Remove Course");
Console.WriteLine("9. Display all courses");
Console.WriteLine("-------------------------------");
Console.WriteLine("0. Exit");
Console.WriteLine("Select an option: ");
Console.WriteLine("");
int optionInt = Convert.ToInt32(Console.ReadLine());
if (optionInt == 1)
{
Console.WriteLine("Teacher Name ?");
string name = Console.ReadLine();
Teacher temp = new Teacher
{
TeacherName = name
};
bl.AddTeacher(temp);
}
else if (optionInt == 2)
{
Console.WriteLine("1. Update Teacher by teacher id");
Console.WriteLine("2. Update Teacher by teacher name");
Console.WriteLine("Select an option: ");
int subOption = Convert.ToInt32(Console.ReadLine());
if (subOption == 1)
{
Console.WriteLine("Teacher ID ?");
int id = Convert.ToInt32(Console.ReadLine());
Teacher teacher = bl.GetTeacherByID(id);
if (teacher == null)
{
Console.WriteLine("Teacher not found!");
}
else
{
Console.WriteLine("Enter new teacher name: ");
teacher.TeacherName = Console.ReadLine();
bl.UpdateTeacher(teacher);
}
}
else if (subOption == 2)
{
Console.WriteLine("Teacher Name ?");
string name = Console.ReadLine();
Teacher temp = bl.GetTeacherByName(name);
if (temp == null)
{
Console.WriteLine("Teacher not found!");
}
else
{
int id = temp.TeacherId;
Teacher teacher = bl.GetTeacherByID(id);
if (teacher == null)
{
Console.WriteLine("Teacher not found!");
}
else
{
Console.WriteLine("Enter new teacher name: ");
teacher.TeacherName = Console.ReadLine();
bl.UpdateTeacher(teacher);
}
}
}
else
{
Console.WriteLine("Input is invalid");
}
}
else if (optionInt == 3)
{
Console.WriteLine("Teacher ID to be deleted?");
int id = Convert.ToInt16(Console.ReadLine());
Teacher teacher = bl.GetTeacherByID(id);
if (teacher == null)
{
Console.WriteLine("Teacher not found !");
}
else
{
Teacher temp = bl.GetCoursesByTeacherID(id);
foreach (var i in temp.Courses)
{
Course c = bl.GetCourseByID(i.CourseId);
c.TeacherId = null;
bl.UpdateCourse(c);
}
bl.RemoveTeacher(teacher);
}
}
else if (optionInt == 4)
{
Console.WriteLine("Teacher ID ?");
int id = Convert.ToInt32(Console.ReadLine());
Teacher teacher = bl.GetCoursesByTeacherID(id);
if (teacher == null || teacher.Courses.Count == 0)
{
Console.WriteLine("No courses associated with this Teacher ID");
}
else
{
foreach (Course c in teacher.Courses)
{
Console.WriteLine("- " + c.CourseName);
}
}
}
else if (optionInt == 5)
{
IEnumerable <Teacher> allTeachers = bl.GetAllTeachers();
Console.WriteLine();
Console.WriteLine("ID Teacher Name");
foreach (Teacher temp in allTeachers)
{
Console.WriteLine(temp.TeacherId + " " + temp.TeacherName);
}
Console.WriteLine();
}
else if (optionInt == 6)
{
Console.WriteLine("Teacher ID ?");
int id = Convert.ToInt32(Console.ReadLine());
Teacher teacher = bl.GetTeacherByID(id);
if (teacher == null)
{
Console.WriteLine("Teacher not found!");
}
else
{
Console.WriteLine("Course Name? ");
string cName = Console.ReadLine();
//Console.WriteLine("Course Location? ");
//string cLocation = Console.ReadLine();
Course temp = new Course()
{
CourseName = cName,
TeacherId = id
};
bl.AddCourse(temp);
}
}
else if (optionInt == 7)
{
Console.WriteLine("1. Update Course by Course id");
Console.WriteLine("2. Update Course by Course name");
Console.WriteLine("Select an option: ");
int subOption = Convert.ToInt32(Console.ReadLine());
if (subOption == 1)
{
Console.WriteLine("Course ID ?");
int id = Convert.ToInt32(Console.ReadLine());
Course course = bl.GetCourseByID(id);
if (course == null)
{
Console.WriteLine("Course not found");
}
else
{
Console.WriteLine("Enter new course name: ");
course.CourseName = Console.ReadLine();
IEnumerable <Teacher> allTeachers = bl.GetAllTeachers();
Console.WriteLine("");
Console.WriteLine("Current available Teachers");
foreach (Teacher temp in allTeachers)
{
Console.WriteLine(temp.TeacherId + " " + temp.TeacherName);
}
Console.WriteLine("Current teacher id is " + course.TeacherId + " . Please enter new teacher id: ");
int idTemp = Convert.ToInt32(Console.ReadLine());
bool flag = false;
foreach (Teacher temp in allTeachers)
{
if (idTemp == temp.TeacherId)
{
flag = true;
}
}
if (flag == true)
{
course.TeacherId = idTemp;
bl.UpdateCourse(course);
}
else
{
Console.WriteLine("Teacher ID is invalid");
}
}
}
else if (subOption == 2)
{
Console.WriteLine("Course Name ?");
string name = Console.ReadLine();
Course tempCourse = bl.GetCourseByName(name);
if (tempCourse == null)
{
Console.WriteLine("Course not found!");
}
else
{
int id = tempCourse.CourseId;
Course course = bl.GetCourseByID(id);
if (course == null)
{
Console.WriteLine("Course not found!");
}
else
{
Console.WriteLine("Enter new course name: ");
course.CourseName = Console.ReadLine();
IEnumerable <Teacher> allTeachers = bl.GetAllTeachers();
Console.WriteLine("");
Console.WriteLine("Current available Teachers");
foreach (Teacher temp in allTeachers)
{
Console.WriteLine(temp.TeacherId + " " + temp.TeacherName);
}
Console.WriteLine("Current teacher id is " + course.TeacherId + " . Please enter new teacher id: ");
int idTemp = Convert.ToInt32(Console.ReadLine());
bool flag = false;
foreach (Teacher temp in allTeachers)
{
if (idTemp == temp.TeacherId)
{
flag = true;
}
}
if (flag == true)
{
course.TeacherId = idTemp;
bl.UpdateCourse(course);
}
else
{
Console.WriteLine("Teacher ID is invalid");
}
}
}
}
else
{
Console.WriteLine("Input is invalid");
}
}
else if (optionInt == 8)
{
Console.WriteLine("Course ID to be deleted?");
int id = Convert.ToInt32(Console.ReadLine());
Course course = bl.GetCourseByID(id);
if (course == null)
{
Console.WriteLine("Course not found!");
}
else
{
bl.RemoveCourse(course);
}
}
else if (optionInt == 9)
{
IEnumerable <Course> allCourses = bl.GetAllCourses();
Console.WriteLine();
Console.WriteLine($"\t {"ID",-5}" + $"{"Course name",-15}" + $"{"TeacherID",-15}");
//Console.WriteLine("ID Course Name TeacherID");
foreach (Course temp in allCourses)
{
Console.WriteLine($"\t {temp.CourseId,-5}" + $"{temp.CourseName,-15}" + $"{temp.TeacherId,-15}");
//Console.WriteLine(temp.CourseId + " " + temp.CourseName+ " " + temp.TeacherId);
}
Console.WriteLine();
}
else if (optionInt == 0)
{
run = false;
}
else
{
Console.WriteLine("Input is invalid, please re-enter the option from 0-9");
}
} //end while
}
