private async void AddStudentButton_Click(object sender, RoutedEventArgs e)
{
Course course;
try
{
course = new Course
{
Code = this.CourseCodeTextBox.Text,
Credit = int.Parse(this.CourseCreditTextBox.Text),
Quota = int.Parse(this.CourseQuotaTextBox.Text)
};
}
catch
{
MessageBox.Show("Please enter valid values for course. (Credit and Quota must be a number)");
return;
}
await _context.AddAsync(course);
await _context.SaveChangesAsync();
MessageBox.Show("Course is added successfully.");
_grid.ItemsSource = await _context.Courses.ToListAsync();
}
public async Task <Student> AddStudent(Student student)
{
if (student == null)
{
throw new ArgumentNullException($"Student must not be null");
}
try
{
await SchoolDbContext.AddAsync(student);
await SchoolDbContext.SaveChangesAsync();
return(student);
}
catch (Exception ex)
{
throw new Exception($"Student could not be saved: {ex.Message}");
}
}
private async void AddStudentButton_Click(object sender, RoutedEventArgs e)
{
Student student = new Student
{
BirthDate = this.StudentBirthDate.DisplayDate,
Name = this.StudentNameTextBox.Text,
StudentId = this.StudentIdTextBox.Text
};
await _context.AddAsync(student);
await _context.SaveChangesAsync();
MessageBox.Show("Student is added successfully.");
_grid.ItemsSource = await _context.Students.ToListAsync();
}
public async virtual Task <T> AddAsync(T entity)
{
try
{
var addedEntity = await dbContext.AddAsync <T>(entity);
return(addedEntity.Entity);
}
catch (DbUpdateConcurrencyException e)
{
var errorMessage = ProcessException("Add db update concurrency error: ",
e.Message,
e.InnerException,
ErrorType.Critical);
throw new DataAccessException(errorMessage);
}
catch (DbUpdateException e)
{
var errorMessage = ProcessException("Add db update error: ",
e.Message,
e.InnerException,
ErrorType.Critical);
throw new DataAccessException(errorMessage);
}
catch (InvalidOperationException e)
{
var errorMessage = ProcessException("Add db invalid operation error: ",
e.Message,
e.InnerException,
ErrorType.Critical);
throw new DataAccessException(errorMessage);
}
catch (Exception e)
{
var errorMessage = ProcessException("Add db general error: ",
e.Message,
e.InnerException,
ErrorType.Critical);
throw new DataAccessException(errorMessage);
}
}
public async Task CreateCourse(Course course)
{
await _context.AddAsync(course);
await _context.SaveChangesAsync();
}