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 addStudentItem_Click(object sender, EventArgs e)
{
if (Text_boxes_empty())
{
return;
}
if (students == null)
{
students = new StudentsCollection();
}
if (students.GetEnumerator().Position + 1 >= students.students_list.Count)
{
students.AddStudent(new Student(FirstNameTextBox.Text, SecondNameTextBox.Text, FacultyTextBox.Text));
students.GetEnumerator().MoveEnd();
deleteStudent.Enabled = true;
SetButtonEnable(TypeAction.Next, false);
SetButtonEnable(TypeAction.Prev, true);
need_updated = true;
FirstNameTextBox.Focus();
MoveToAddForm();
toolStripLabelnfo.Text = "Студент добавлен";
}
else
{
toolStripLabelnfo.Text = "Перейдите в поле для добавления";
}
}
private void CreateSpisokItem_Click(object sender, EventArgs e)
{
if (need_updated == true)
{
if (students != null)
{
if (students.students_list.Count > 0)
{
DialogResult result = WantSaveList();
if (result == DialogResult.Yes)
{
SaveSpisokClick(sender, e);
}
else if (result == DialogResult.Cancel)
{
return;
}
}
}
}
students = new StudentsCollection();
need_updated = true;
SetButtonEnable(TypeAction.Prev, false);
SetButtonEnable(TypeAction.Next, false);
toolStripLabelnfo.Text = "Пустой список создан";
}
static void Main(string[] args)
{
List <Student> students = CreateStudents();
// --------------------------------------------------------------------------
Console.WriteLine("Iterate over students with for loop:");
Console.WriteLine();
// classic collection iteration
for (int i = 0; i < students.Count; i++)
{
Console.WriteLine("Name: {0}, Age: {1}, IQ: {2}", students[i].Name, students[i].Age, students[i].Iq);
}
Console.WriteLine();
Console.WriteLine();
// --------------------------------------------------------------------------
Console.WriteLine("Iterate over students using foreach loop:");
Console.WriteLine();
// fore each s in the collection of students (IEnumerable loop)
foreach (var s in students)
{
// output "s" information to console
Console.WriteLine("Name: {0}, Age: {1}, IQ: {2}", s.Name, s.Age, s.Iq);
}
Console.WriteLine();
Console.WriteLine();
// --------------------------------------------------------------------------
Console.WriteLine("Sort students and iterate over sorted students using foreach loop:");
Console.WriteLine();
// use built-in Sort method on List<T> which will use IComparable<T> implementation from Student class
students.Sort();
// fore each s in the collection of students (IEnumerable loop)
foreach (var s in students)
{
// output "s" information to console
Console.WriteLine("Name: {0}, Age: {1}, IQ: {2}", s.Name, s.Age, s.Iq);
}
Console.WriteLine();
Console.WriteLine();
// --------------------------------------------------------------------------
Console.WriteLine("Iterate over sorted students using while loop and enumerator \"manually\":");
Console.WriteLine();
var enumarator = students.GetEnumerator();
// proceed to next item until enumerator is completed
while (enumarator.MoveNext())
{
// acquire current item
var s = enumarator.Current;
// output "s" information to console
Console.WriteLine("Name: {0}, Age: {1}, IQ: {2}", s.Name, s.Age, s.Iq);
}
Console.WriteLine();
Console.WriteLine();
// --------------------------------------------------------------------------
try
{
// create custom students collection class instance
var collection = new StudentsCollection(students);
Console.WriteLine("Iterate over custom collection of students using custom iterator:");
Console.WriteLine();
// fore each item in the collection of students
foreach (var item in collection)
{
// output "item" information to console
Console.WriteLine("Name: {0}, Age: {1}, IQ: {2}", item.Name, item.Age, item.Iq);
}
}
catch (NotImplementedException)
{
Console.WriteLine("Iterating over StudensCollection is not supported yet.");
}
Console.ReadLine();
}
