// Button delete student
private void BtnDelete_Click(object sender, EventArgs e)
{
// Trying to find a student
ClsStudent lcStudent = (ClsStudent)LstStudents.SelectedItem;
// If list is empty
if (lcStudent == null)
{
// Display Message box
DialogResult CantDelete = MessageBox.Show("No students exist to delete", "Delete Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
// User clicks ok
if (CantDelete == DialogResult.OK)
{
// And messagebox closes
return;
}
}
// Display message box asking user if they want to delete
DialogResult DeleteStudent = MessageBox.Show("You are about to delete a student, are you sure?", "Delete student", MessageBoxButtons.YesNo, MessageBoxIcon.Warning);
// If user clicks yes
if (DeleteStudent == DialogResult.Yes)
{
// Delete the student
RemoveStudent();
}
}
private void StudentEdit()
{
// Locating the student that the user has highlighted
ClsStudent lcStudent = (ClsStudent)LstStudents.SelectedItem;
// If student exists and is selected
if (lcStudent != null)
{
// We will edit them
EditStudent();
}
else
{
// Else we will display a message box saying no students exists amd ask if they would like to create one instead
DialogResult NoStudent = MessageBox.Show("No students exist would you like to create one now?", "Error", MessageBoxButtons.YesNo, MessageBoxIcon.Error);
// If user clicked on yes
if (NoStudent == DialogResult.Yes)
{
// We will create the student
CreateStudent();
}
else
{
// Else we will cancel
return;
}
}
}
// Display FrmStudent
// V3, Show dialog now returns a boolinstead of dialog result, as ClsMOEStudent and ClsInternationalStudent are calling show dialog we don't want classes to concern themselves with windows specific items, change is good style
public bool ShowDialog(ClsStudent prStudent)
{
// Creating and storing the parameter value in our member variable
_Student = prStudent;
// Calling the update display method so it will populate the form
UpdateDisplay();
// Returnung the values to the form and display them
// V3, now just returns a bool
return(ShowDialog() == DialogResult.OK);
}
// Delete student method
private void RemoveStudent()
{
// Find selected student
ClsStudent lcStudent = (ClsStudent)LstStudents.SelectedItem;
// Remove them
// V5 edit, as this is a dictionary we need to find the ID
ClsInstitute.StudentList.Remove(lcStudent.ID);
// Then update the listbox
UpdateDisplay();
}
// Edit student method
private void EditStudent()
{
// Locating the student that the user has highlighted
ClsStudent lcStudent = (ClsStudent)LstStudents.SelectedItem;
// If student details is not null and editing was successful
if (lcStudent != null && lcStudent.ViewEdit())
{
// Then update display
UpdateDisplay();
}
}
// Create student method
private void CreateStudent()
{
// We create a new student by calling the factory method NewStudent() in ClsStudent and storing it in the local variable lcStudent
ClsStudent lcStudent = ClsStudent.NewStudent(CboStudentType.SelectedIndex);
// If it was successful
if (lcStudent != null && lcStudent.ViewEdit())
{
// We add the student to the student list
// V5 edit, as we are using a dictionary this changes a little compared to the list one
ClsInstitute.StudentList.Add(lcStudent.ID, lcStudent);
// Then update the display to show the student in the list box
UpdateDisplay();
}
}