private void GradeModification(object sender, RoutedEventArgs e)
{
GradeWindow gw = new GradeWindow
{
comboBoxCourses =
{
ItemsSource = _factory.GetRepository().Courses,
SelectedIndex = 0
}
};
if (gw.ShowDialog() != true)
return;
//Since the starting index is predetermined, the Course value cannot be null
var newGrade = new Grade(gw.comboBoxCourses.SelectionBoxItem as Course, int.Parse(gw.textBoxMark.Text));
try
{
_factory.GetRepository().AddGrade(newGrade);
}
catch (ArgumentNullException)
{
MessageBox.Show("Could not add/edit the grade. Please try again.", "Null error", MessageBoxButton.OK,
MessageBoxImage.Error);
}
catch (ArgumentException)
{
_factory.GetRepository().EditGrade(newGrade);
}
}
private void CheckGrade(Grade grade)
{
if (grade == null)
{
throw new ArgumentNullException();
}
}
private void buttonOK_Click(object sender, RoutedEventArgs e)
{
try
{
Grade grade = new Grade((Course)comboBoxCourses.SelectedValue, Convert.ToInt32(textBoxMark.Text));
if (_sender.Name.Equals("buttonAdd"))
{
_repository.AddGrade(grade);
}
else
{
_repository.EditGrade(grade);
}
DialogResult = true;
}
catch (ArgumentNullException)
{
MessageBox.Show(ArgumentNullExceptionMessage, ErrorMessage);
}
catch (FormatException)
{
MessageBox.Show(FormatExceptionMessage, ErrorMessage);
}
catch (ArgumentException)
{
MessageBox.Show(ArgumentExceptionMessage, ErrorMessage);
}
catch (Exception)
{
MessageBox.Show(UnhandledErrorMessage, ErrorMessage);
}
}
public void EditGrade(Grade grade)
{
CheckGrade(grade);
var tmpIndex = _grades.FindIndex(g => g.Course.Equals(grade.Course));
grade.Id = tmpIndex;
_grades[tmpIndex] = grade;
Save();
GradesChangedRun();
}
public void EditGrade(Grade grade)
{
if (grade == null)
throw new ArgumentNullException();
foreach (var gradeInList in Grades.Where(gradeInList => gradeInList.Equals(grade)))
gradeInList.Mark = grade.Mark;
Save();
if (GradesChanged != null)
GradesChanged.Invoke();
}
public void AddGrade(Grade grade)
{
CheckGrade(grade);
if (_grades.Any(g => g.Equals(grade)))
{
throw new ArgumentException();
}
grade.Id = _grades.Count;
_grades.Add(grade);
Save();
GradesChangedRun();
}
public void AddGrade(Grade grade)
{
if (grade == null)
throw new ArgumentNullException();
//Method List<T>.Contains(T obj) uses the overriden Equals methods for objects Grade and Course, therefore it is eligible
if (Grades.Contains(grade))
throw new ArgumentException();
grade.Id = _idHolder++;
Grades.Add(grade);
Save();
if (GradesChanged != null)
GradesChanged.Invoke();
}
