/// <summary>
/// The form is initially created, but loaded each time it is shown.
/// So make sure the context is created in the Load event.
///
/// This is the handler for the Load event.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void AddOrUpdateCourseForm_Load(object sender, EventArgs e)
{
this.Tag = null;
// Get the context and load the inventory table
context = new StudentRegistrationEntities();
context.Database.Log = s => Debug.Write(s);
context.SaveChanges();
context.Departments.Load();
context.Courses.Load();
// bind the listbox of Department to the Department table.
listBoxCourses.DataSource = context.Courses.Local.ToBindingList();
listBoxDepartment.DataSource = context.Departments.Local.ToBindingList();
// no department is selected to start
listBoxCourses.SelectedIndex = -1;
listBoxDepartment.SelectedIndex = -1;
// set all textboxes to blank
textBoxCourseName.ResetText();
textBoxCourseNumber.ResetText();
}
public StudentRegistrationMainForm()
{
InitializeComponent();
this.Text = "Student Registration using AddUpdate Forms";
context = new StudentRegistrationEntities();
context.Database.Log = (s => Debug.Write(s));
context.SeedDatabase();
context.SaveChanges();
this.Load += (s, e) => StudentRegistratioMainForm_Load();
// set the event handlers for buttons
AddOrUpdateStudent addOrUpdateStudentForm = new AddOrUpdateStudent();
buttonStudent.Click += (s, e) => AddOrUpdateForm <Student>(dataGridViewStudent, addOrUpdateStudentForm);
AddOrUpdateDepartment addOrUpdateDepartmentForm = new AddOrUpdateDepartment();
buttonDepartment.Click += (s, e) => AddOrUpdateForm <Department>(dataGridViewDepartment, addOrUpdateDepartmentForm);
AddOrUpdateCourse addOrUpdateCourseForm = new AddOrUpdateCourse();
buttonCourse.Click += (s, e) => AddOrUpdateForm <Course>(dataGridViewCourse, addOrUpdateCourseForm);
buttonRegister.Click += ButtonRegister_Click;
buttonDrop.Click += ButtonDrop_Click;
}
/// <summary>
/// Remove selected Row
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ButtonDrop_Click(object sender, EventArgs e)
{
/* foreach (DataGridViewRow row in dataGridViewRegistration.SelectedRows)
* {
* dataGridViewRegistration.Rows.RemoveAt(row.Index);
* }*/
StudentRegistrationEntities context = new StudentRegistrationEntities();
context.Students.Load();
context.Courses.Load();
context.Database.Log = (s => Debug.Write(s));
context.SaveChanges();
// get the students and courses, and include nav properties
var students = context.Students.Include("Courses").ToList();
var courses = context.Courses.Include("Students").ToList();
foreach (DataGridViewRow row in dataGridViewRegistration.SelectedRows)
{
StudentCourseRegistration registration = row.DataBoundItem as StudentCourseRegistration;
// find the student in the db
Student student = students.Find(s => s.StudentId == registration.StudentID);
// find the course in teh db
Course course = courses.Find(c => c.CourseNumber == registration.CourseNumber && c.DepartmentId == registration.course.DepartmentId);
student.Courses.Remove(course);
}
context.SaveChanges();
context.Dispose();
UpdateRegistration();
}
protected void Page_Load(object sender, EventArgs e)
{
base.Page_Load(sender, e);
if (!Page.IsPostBack)
{
drpSemester.AppendDataBoundItems = true;
drpSemester.DataSource = Semester.ToList();
drpYears.AppendDataBoundItems = true;
drpYears.DataSource = Years.ToList();
using (StudentRegistrationEntities entityContext = new StudentRegistrationEntities())
{
var cs = (from c in entityContext.Courses
orderby c.CourseTitle
select new
{
CourseId = c.CourseID,
CourseText = c.CourseID + " - " + c.CourseTitle
}).ToList();
if (cs.Count() == 0)
{
Response.Redirect("AddCourse.aspx");
}
else
{
drpCourse.DataSource = cs;
drpCourse.DataTextField = "CourseText";
drpCourse.DataValueField = "CourseID";
drpCourse.AppendDataBoundItems = true;
}
}
}
}
/// <summary>
/// Method to display all registrations
/// </summary>
/// <param name="datagridviewRegistrations"> datagridview to be used for display</param>
private static void InitializeRegistrationView(DataGridView datagridviewRegistrations)
{
// set number of columns
datagridviewRegistrations.ColumnCount = 5;
// Set the column header names.
datagridviewRegistrations.Columns[0].Name = "Department";
datagridviewRegistrations.Columns[1].Name = "Course Number";
datagridviewRegistrations.Columns[2].Name = "Course Name";
datagridviewRegistrations.Columns[3].Name = "Student ID";
datagridviewRegistrations.Columns[4].Name = "Last Name";
// using unit-of-work context
using (StudentRegistrationEntities context = new StudentRegistrationEntities())
{
// loop through all courses
foreach (Course course in context.Courses)
{
// loop over all courses for each student
foreach (Student st in course.Students)
{
// get the needed information
string[] rowAdd = { course.Department.DepartmentCode, course.CourseNumber.ToString(), course.CourseName, st.StudentId.ToString(), st.StudentLastName };
// add to display
datagridviewRegistrations.Rows.Add(rowAdd);
}
}
}
// set all properties
datagridviewRegistrations.AllowUserToAddRows = false;
datagridviewRegistrations.AllowUserToDeleteRows = false;
datagridviewRegistrations.ReadOnly = true;
datagridviewRegistrations.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;
}
protected void Page_Load(object sender, EventArgs e)
{
base.Page_Load(sender, e);
if (!Page.IsPostBack)
{
using (StudentRegistrationEntities entityContext = new StudentRegistrationEntities())
{
var courseOfferingList = (from c in entityContext.CourseOfferings
orderby c.Year, c.Semester, c.Course.CourseTitle
select new
{
CourseCode = c.Course_CourseID + ";" +
c.Year + ";" +
c.Semester,
CourseOfferingText = c.Course_CourseID + " " + c.Course.CourseTitle + " " + c.Year + " " + c.Semester
}).ToList();
if (courseOfferingList.Count() == 0)
{
Response.Redirect("AddCourseOffering.aspx");
}
else
{
drpCourseOfferingList.DataSource = courseOfferingList;
drpCourseOfferingList.DataTextField = "CourseOfferingText";
drpCourseOfferingList.DataValueField = "CourseCode";
drpCourseOfferingList.AppendDataBoundItems = true;
drpCourseOfferingList.DataBind();
}
}
}
}
/// <summary>
/// See if a course's id is already taken by another item in course
/// </summary>
/// <param name="course"></param>
/// <returns></returns>
public static bool CourseExists(this Course course)
{
using (StudentRegistrationEntities context = new StudentRegistrationEntities())
{
context.Database.Log = (s => Debug.Write(s));
return(context.Courses.Any(c => c.CourseNumber == course.CourseNumber) && context.Courses.Any(c => c.DepartmentId == course.DepartmentId));
}
}
/// <summary>
/// See if a department's id is already taken by another item in department
/// </summary>
/// <param name="color"></param>
/// <returns></returns>
public static bool DepartmentExists(this Department department)
{
using (StudentRegistrationEntities context = new StudentRegistrationEntities())
{
context.Database.Log = (s => Debug.Write(s));
return(context.Departments.Any(c => c.DepartmentId == department.DepartmentId) || context.Departments.Any(c => c.DepartmentCode == department.DepartmentCode));
}
}
private StudentRegistrationEntities context; // save DB context here
public FormStudentRegistration()
{
InitializeComponent();
// set up the database
context = new StudentRegistrationEntities();
}
protected void btnSubmitCourse_Click(object sender, EventArgs e)
{
Course course = new Course(txtCourseNumber.Text, txtCourseName.Text, int.Parse(txtWeeklyHours.Text));
using (StudentRegistrationEntities entityContext = new StudentRegistrationEntities())
{
entityContext.Courses.Add(course);
entityContext.SaveChanges();
}
}
private StudentRegistrationEntities context; // save DB context here
public StudentRegistrationMainAppForm()
{
InitializeComponent();
context = new StudentRegistrationEntities();
this.Load += StudentRegistrationMainAppForm_Load;
buttonRegister.Click += ButtonRegister_Click;
buttonUpdate.Click += ButtonUpdate_Click;
}
public void LoadRegistrationView()
{
using (StudentRegistrationEntities ordersViewContext = new StudentRegistrationEntities())
{
ordersViewContext.Database.Log = (s => Debug.Write(s));
// force a read from the db, and we don't need to track these entities
dataGridViewRegistration.DataSource = dataGridViewRegistrationContext.Student.AsNoTracking().ToList();
dataGridViewRegistration.Refresh();
}
}
/// <summary>
/// Load the CustomerOrders view from the db. We need to force a database read,
/// so the best way is to create a new context and get all the entities for
/// the CustomerOrders view in the db.
///
/// </summary>
public void LoadStudentRegisterView()
{
using (StudentRegistrationEntities registrationView = new StudentRegistrationEntities())
{
registrationView.Database.Log = (s => Debug.Write(s));
// force a read from the db, and we don't need to track these entities
dataGridViewRegistration.DataSource = registrationView.Students.AsNoTracking().ToList();
dataGridViewRegistration.Refresh();
}
}
protected void btnSubmitCourseOffering_Click(object sender, EventArgs e)
{
using (StudentRegistrationEntities entityContext = new StudentRegistrationEntities())
{
var course = (from c in entityContext.Courses
where c.CourseID == drpCourse.SelectedValue
select c).FirstOrDefault <Course>();
CourseOffering courseOffering = new CourseOffering(course, int.Parse(drpYears.SelectedValue), drpSemester.SelectedValue);
entityContext.CourseOfferings.Add(courseOffering);
entityContext.SaveChanges();
}
drpCourse.SelectedIndex = drpYears.SelectedIndex = drpSemester.SelectedIndex = 0;
}
public AddOrUpdateStudent()
{
InitializeComponent();
context = new StudentRegistrationEntities();
// register the event handlers
this.Load += AddOrUpdateStudentForm_Load;
buttonStudentAdd.Click += ButtonAdd_Click;
buttonStudentUpdate.Click += ButtonUpdate_Click;
// register event handler for when a car is selected
listBoxStudent.SelectedIndexChanged += (s, e) => GetStudent();
}
/// <summary>
/// Register selected student and course
/// and add to the registration table
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ButtonRegister_Click(object sender, EventArgs e)
{
StudentRegistrationEntities context = new StudentRegistrationEntities();
context.Students.Load();
context.Courses.Load();
context.Database.Log = (s => Debug.Write(s));
context.SaveChanges();
var students = context.Students.Include("Courses").ToList();
var courses = context.Courses.Include("Students").ToList();
// check if bothe student and course are selected
if (dataGridViewStudent.SelectedRows.Count == 0 || dataGridViewCourse.SelectedRows.Count == 0)
{
MessageBox.Show("No students or Courses selected");
return;
}
// get the selected students and keep in a list
List <Student> studentsToRegister = new List <Student>();
foreach (DataGridViewRow row in dataGridViewStudent.SelectedRows)
{
Student student = row.DataBoundItem as Student;
studentsToRegister.Add(students.Find(s => s.StudentId == student.StudentId));
}
List <Course> courseToRegister = new List <Course>();
foreach (DataGridViewRow row in dataGridViewCourse.SelectedRows)
{
Course course = row.DataBoundItem as Course;
courseToRegister.Add(courses.Find(c => c.CourseId == course.CourseId && c.DepartmentId == course.DepartmentId));
}
foreach (Course c in courseToRegister)
{
foreach (Student s in studentsToRegister)
{
c.Students.Add(s);
}
}
context.SaveChanges();
UpdateRegistration();
context.Dispose();
}
/// <summary>
/// Method to load all datagridviews and seed the initial database
/// </summary>
private void StudentRegistrationAppMainForm_Load()
{
// using the Unit-of-work context
// seed the database
using (StudentRegistrationEntities context = new StudentRegistrationEntities())
{
context.SeedDatabase();
}
// common setup for datagridview controls
InitializeDataGridView <Student>(dataGridViewStudents, "Courses", "Department");
InitializeDataGridView <Course>(dataGridViewCourses, "Students", "Department");
InitializeDataGridView <Department>(dataGridViewDepartments, "Courses", "Students");
// set up the registration view using a custom method
InitializeRegistrationView(dataGridViewRegistrations);
}
private StudentRegistrationEntities context; // save DB context here
public FormStudentRegistration()
{
InitializeComponent();
// set up the database
context = new StudentRegistrationEntities();
// set up database log to write to output window in VS
context.Database.Log = s => Debug.Write(s);
context.SaveChanges();
// delete db if exists, then create
context.Database.Delete();
context.Database.Create();
}
protected CourseOffering GetCourseOfferingFromDropdown(StudentRegistrationEntities entityContext)
{
string[] details = drpCourseOfferingList.SelectedValue.Split(';');
if (details.Count() < 3)
{
return(new CourseOffering());
}
string courseID = details[0];
int year = int.Parse(details[1]);
string semester = details[2];
var cos = (from co in entityContext.CourseOfferings
where co.Course.CourseID == courseID && co.Year == year && co.Semester == semester
select co).FirstOrDefault <CourseOffering>();
return(cos);
}
protected void Page_PreRender(object sender, EventArgs e)
{
using (StudentRegistrationEntities entityContext = new StudentRegistrationEntities())
{
var courseOfferingList = (from c in entityContext.CourseOfferings
orderby c.Year, c.Semester, c.Course.CourseTitle
select new
{
CourseCode = c.Course_CourseID,
Title = c.Course.CourseTitle,
Year = c.Year,
Semester = c.Semester
}).ToList();
gvAddCourseOffering.DataSource = courseOfferingList;
}
DataBind();
}
protected void Page_PreRender(object sender, EventArgs e)
{
using (StudentRegistrationEntities entityContext = new StudentRegistrationEntities())
{
//List<Course> courseList = entityContext.Courses.ToList<Course>();
var courseList = (from c in entityContext.Courses
orderby c.CourseTitle
select new
{
CourseId = c.CourseID,
CourseTitle = c.CourseTitle,
WeeklyHours = c.HoursPerWeek
}).ToList();
gvAddCourse.DataSource = courseList;
}
DataBind();
}
/// <summary>
/// Method to add registration
/// </summary>
/// <param name="students"> datagridview from which a student was selected</param>
/// <param name="courses"> datagridview from which a course was selected</param>
private void RegisterStudent(DataGridView students, DataGridView courses)
{
// if one was not selected- error
if (students.SelectedRows.Count == 0 || courses.SelectedRows.Count == 0)
{
MessageBox.Show("Please Select a Student and a Course for Registration!");
}
else
{
// using unit-of-work context
using (StudentRegistrationEntities context = new StudentRegistrationEntities())
{
// foreach of the students
foreach (DataGridViewRow row in students.SelectedRows)
{
// check that it is a student - not really required (since mostly display!)
// but just in case
if (row.DataBoundItem is Student student)
{
// go through all selected courses
foreach (DataGridViewRow rowCourse in courses.SelectedRows)
{
// check that it is a course - not really required (since mostly display!)
// but just in case
if (rowCourse.DataBoundItem is Course course)
{
// get course and student from the context
var courseFromContext = context.Courses.Find(course.CourseId);
var studentFromContext = context.Students.Find(student.StudentId);
// add the course to the student
//could've been other way around
studentFromContext.Courses.Add(courseFromContext);
context.SaveChanges(); // save changes
}
}
}
}
}
}
// reload the display of the registrations
ReloadRegistrationView();
}
protected void Page_PreRender(object sender, EventArgs e)
{
using (StudentRegistrationEntities entityContext = new StudentRegistrationEntities())
{
CourseOffering courseOffering = GetCourseOfferingFromDropdown(entityContext);
List <Student> studentList = courseOffering.Students.ToList <Student>();
gvAddStudent.DataSource = studentList;
if (drpCourseOfferingList.SelectedIndex == 0)
{
gvAddStudent.EmptyDataText = "No Course Offering Selected";
}
else if (studentList.Count == 0)
{
gvAddStudent.EmptyDataText = "No Students Registered";
}
gvAddStudent.DataBind();
}
}
/// <summary>
/// Method to reload data in the registration view
/// </summary>
private void ReloadRegistrationView()
{
// clear all rows
dataGridViewRegistrations.Rows.Clear();
//using unit-of-work displosable context
using (StudentRegistrationEntities registrationViewContext = new StudentRegistrationEntities())
{
// loop through all courses
foreach (Course course in registrationViewContext.Courses)
{
// loop over all courses for each student
foreach (Student st in course.Students)
{
// get needed data
string[] rowAdd = { course.Department.DepartmentCode, course.CourseNumber.ToString(), course.CourseName, st.StudentId.ToString(), st.StudentLastName };
dataGridViewRegistrations.Rows.Add(rowAdd); // add to the datagridview
}
}
}
}
public MainForm()
{
InitializeComponent();
this.Text = "Student Using Add/Update Forms App using EF Code First from DB library";
context = new StudentRegistrationEntities();
context.Database.Log = (s => Debug.Write(s));
context.SeedDatabase();
context.SaveChanges();
this.Load += (s, e) => MainForm_Load();
StudentForm studentForm = new StudentForm();
buttonStudent.Click += (s, e) => AddOrUpdateForm <Student>(dataGridViewStudents, studentForm);
DepartmentForm departmentForm = new DepartmentForm();
buttonDepartment.Click += (s, e) => AddOrUpdateForm <Department>(dataGridViewDepartment, departmentForm);
}
/// <summary>
/// Method to remove all students from the department given the departmentID
/// </summary>
/// <param name="departmentId"> department id to remove </param>
/// <param name="studentsDisplay"> datagridview of students to display changes</param>
private static void RemoveStudentsFromDepartment(int departmentId, DataGridView studentsDisplay)
{
// using unit-of-work context
using (StudentRegistrationEntities context = new StudentRegistrationEntities())
{
// get the students in that department
var students = context.Students.Where(x => x.DepartmentId == departmentId).ToList();
// for all- set their department and departmentId to null
foreach (Student st in students)
{
st.Department = null;
st.DepartmentId = null;
}
// save changes
context.SaveChanges();
}
// refresh the display to show changes
studentsDisplay.DataSource = Controller <StudentRegistrationEntities, Student> .SetBindingList();
studentsDisplay.Refresh();
}
protected void AddStudent_Click(object sender, EventArgs e)
{
if (drpCourseOfferingList.SelectedValue != "-1")
{
using (StudentRegistrationEntities entityContext = new StudentRegistrationEntities())
{
List <Student> studentList = entityContext.Students.ToList <Student>();
var student = (from c in studentList
where c.StudentNum == txtStudentNumber.Text
select c).FirstOrDefault <Student>();
if (student == null)
{
if (rbFullTime.Checked)
{
student = new FullTimeStudent(txtStudentNumber.Text, txtStudentName.Text);
}
else if (rbPartTime.Checked)
{
student = new PartTimeStudent(txtStudentNumber.Text, txtStudentName.Text);
}
else if (rbCoop.Checked)
{
student = new CoopStudent(txtStudentNumber.Text, txtStudentName.Text);
}
entityContext.Students.Add(student);
entityContext.SaveChanges();
}
CourseOffering courseOffering = GetCourseOfferingFromDropdown(entityContext);
List <Student> registeredStudents = courseOffering.Students.ToList <Student>();
if (!registeredStudents.Exists(x => x.Number == student.Number))
{
courseOffering.Students.Add(student);
entityContext.SaveChanges();
}
}
}
}
/// <summary>
/// Method to drop a registration
/// </summary>
/// <param name="registrations"> datagridview to be processed</param>
private void DropFromCourse(DataGridView registrations)
{
// if none is selected - error!
if (registrations.SelectedRows.Count == 0)
{
MessageBox.Show("Please Select a Registration to be dropped!");
}
else
{
// using unit-of-work context
using (StudentRegistrationEntities context = new StudentRegistrationEntities())
{
// for every selected row
foreach (DataGridViewRow row in registrations.SelectedRows)
{
// find the student based on ID
int selectedStudentID = Convert.ToInt32(row.Cells[3].Value);
Student selectedStudent = context.Students.Find(selectedStudentID);
// look for Department ID
string departmentCode = Convert.ToString(row.Cells[0].Value);
Department selectedDepartment = context.Departments.SingleOrDefault(department => department.DepartmentCode == departmentCode);
int selectedDepartmentId = selectedDepartment.DepartmentId;
// look for Course ID
int courseNumber = Convert.ToInt32(row.Cells[1].Value);
Course selectedCourse = context.Courses.SingleOrDefault(course => course.CourseNumber == courseNumber && course.DepartmentId == selectedDepartmentId);
// remove the course from the student
selectedStudent.Courses.Remove(selectedCourse);
context.SaveChanges(); // save changes
}
}
// reload the display to show changes
ReloadRegistrationView();
}
}
public StudentRepository(StudentRegistrationEntities dbContext)
{
_dbContext = dbContext;
}
private StudentRegistrationEntities context; // save DB context here
public StudentRegistrationMainAppForm()
{
InitializeComponent();
context = new StudentRegistrationEntities();
}
public FormStudentRegistration()
{
InitializeComponent();
context = new StudentRegistrationEntities();
}
public CourseOfferingRepository(StudentRegistrationEntities dbContext)
{
_dbContext = dbContext;
}