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(); }