public Form2(StudentsContainer students, StudentsContainer deductedStudents)
{
InitializeComponent();
this.students = students;
this.deductedStudents = deductedStudents;
LoadStudentsInGrid();
}
public void Load(ref StudentsContainer students, ref StudentsContainer deductedStudents)
{
// чтение из файла
try
{
FileStream fstream = new FileStream($"{path}.txt", FileMode.Open);
load(fstream, ref students, ref deductedStudents);
fstream.Close();
return;
}
catch { }
try
{
FileStream fstream = new FileStream($"{path}.dat", FileMode.Open);
load(fstream, ref students, ref deductedStudents);
fstream.Close();
return;
}
catch { }
try
{
FileStream fstream = new FileStream($"{path}.bin", FileMode.Open);
load(fstream, ref students, ref deductedStudents);
fstream.Close();
return;
}
catch {
MessageBox.Show("Файл не существует");
}
}
private void load(FileStream fstream, ref StudentsContainer students, ref StudentsContainer deductedStudents)
{
// преобразуем строку в байты
byte[] array = new byte[fstream.Length];
// считываем данные
fstream.Read(array, 0, array.Length);
// декодируем байты в строку
string textFromFile = System.Text.Encoding.Default.GetString(array);
foreach (var line in textFromFile.Split('\n'))
{
string s = line.Trim();
var parts = s.Split(',');
var student = new Student(parts[0], parts[1], parts[2], parts[3], Boolean.Parse(parts[4]));
if (student.IsDeducted)
{
deductedStudents.Add(student);
}
else
{
students.Add(student);
}
}
}
private void LoadInputFile(string filename)
{
students = new StudentsContainer();
deductedStudents = new StudentsContainer();
inFileContainer = new FileContainer(filename);
inFileContainer.Load(ref students, ref deductedStudents);
LoadStudentsInGrid();
}
private void save(string ext, ref StudentsContainer students, ref StudentsContainer deductedStudents)
{
FileStream fstream = new FileStream($"{path}.{ext}", FileMode.Create);
byte[] array;
int offset = 0;
int len = students.Count;
int i = 0;
foreach (Student student in students)
{
i++;
string text = student.Name + ',' + student.Group + ',' + student.Subject + ',' + student.Mark + ',' + student.IsDeducted.ToString();
if (i < len)
{
text += Environment.NewLine;
}
array = System.Text.Encoding.Default.GetBytes(text);
fstream.Write(array, 0, array.Length);
offset += array.Length;
}
if (deductedStudents.Count > 0)
{
if (students.Count > 0)
{
array = System.Text.Encoding.Default.GetBytes(Environment.NewLine);
fstream.Write(array, 0, array.Length);
}
i = 0;
foreach (Student student in deductedStudents)
{
i++;
string text = student.Name + ',' + student.Group + ',' + student.Subject + ',' + student.Mark + ',' + student.IsDeducted.ToString();
if (i < deductedStudents.Count)
{
text += Environment.NewLine;
}
array = System.Text.Encoding.Default.GetBytes(text);
fstream.Write(array, 0, array.Length);
offset += array.Length;
}
}
fstream.Close();
}
public void Save(ref StudentsContainer students, ref StudentsContainer deductedStudents)
{
save("txt", ref students, ref deductedStudents);
save("bin", ref students, ref deductedStudents);
save("dat", ref students, ref deductedStudents);
}