private void OpenSpisokClick(object sender, EventArgs e) { if (need_updated == true) { DialogResult result = WantSaveList(); if (result == DialogResult.Yes) { SaveSpisokClick(sender, e); } else if (result == DialogResult.Cancel) { return; } } dlg_open.InitialDirectory = Directory.GetCurrentDirectory(); if (dlg_open.ShowDialog() == DialogResult.OK) { file_name = dlg_open.FileName; DirectoryInfo info = new DirectoryInfo(file_name); if (info.Extension != ".xml") { toolStripLabelnfo.Text = "Файл имеет неверное расширение"; return; } toolStripLabelnfo.Text = "Файл открыт: " + info.Name; XmlSerializer formatter = new XmlSerializer(typeof(List <Student>)); using FileStream fs = new FileStream(file_name, FileMode.OpenOrCreate); try { students = new StudentsCollection((List <Student>)formatter.Deserialize(fs)); need_updated = false; SetButtonEnable(TypeAction.Prev, false); deleteStudent.Enabled = true; if (students.students_list.Count == 0) { deleteStudent.Enabled = false; SetButtonEnable(TypeAction.Next, false); } else { button_update.Enabled = true; deleteStudent.Enabled = true; SetButtonEnable(TypeAction.Next, true); } if (students.GetEnumerator().MoveFirst()) { FirstNameTextBox.Text = students.Current.FirstName; SecondNameTextBox.Text = students.Current.SecondName; FacultyTextBox.Text = students.Current.Faculty; } } catch { toolStripLabelnfo.Text = "Файл пустой"; } } }
private void Previous_Click(object sender, EventArgs e) //кнопка предыдущий на форме { button_update.Enabled = true; SetButtonEnable(TypeAction.Next, true); if (students.GetEnumerator().MovePrev()) { FirstNameTextBox.Text = students.Current.FirstName; SecondNameTextBox.Text = students.Current.SecondName; FacultyTextBox.Text = students.Current.Faculty; if (students.GetEnumerator().IsFirst()) { SetButtonEnable(TypeAction.Prev, false); } } else { SetButtonEnable(TypeAction.Prev, false); } }