private int GetDistance()
{
FileStream stream = new FileStream(fileName, FileMode.OpenOrCreate);
BinaryFormatter bf = new BinaryFormatter();
int startDay = -1, finishDay = -1, count = 0;
while (stream.Position < stream.Length)
{
AverageTemp readData = (AverageTemp)bf.Deserialize(stream); // восстановление объекта
if (readData.Temperature < 0)
{
if (startDay == -1)
{
startDay = count;
}
if (count >= startDay)
{
finishDay = count;
}
}
count++;
}
stream.Close();
int distance = 0;
if (finishDay > startDay)
{
distance = finishDay - startDay - 1;
}
return(distance);
}
/// <summary>
/// Добавление в заданную позицию
/// </summary>
private void AddToFileByIndex(AverageTemp averageTemp, int index)
{
FileStream temp = new FileStream("Temp.bin", FileMode.Create);
BinaryFormatter bf = new BinaryFormatter();
FileStream stream = new FileStream(fileName, FileMode.OpenOrCreate);
stream.Position = 0;
int count = 0;
while (stream.Position < stream.Length)
{
AverageTemp obj = (AverageTemp)bf.Deserialize(stream); // восстановление объекта
if (count == index - 1)
{
bf.Serialize(temp, averageTemp);
}
if (!obj.Deleted)
{
bf.Serialize(temp, obj); // сохранение объекта в потоке f
count++;
}
}
stream.Close();
temp.Close();
File.Delete(fileName);
File.Move("Temp.bin", fileName);
File.Delete("Temp.bin");
}
private void EditByIndex(int index)
{
FileStream stream = new FileStream(fileName, FileMode.Open);
BinaryFormatter bf = new BinaryFormatter();
AverageTemp obj = null;
int count = 0;
long position = 0;
while (stream.Position < stream.Length)
{
position = stream.Position;
obj = (AverageTemp)bf.Deserialize(stream); // восстановление объекта
if (listBox1.SelectedIndex == count)
{
break;
}
count++;
}
EditForm editForm = new EditForm(obj);
DialogResult dr = editForm.ShowDialog();
if (dr == DialogResult.OK)
{
stream.Position = position;
bf.Serialize(stream, editForm.AverageTemp); // сохранение объекта в потоке
listBox1.Items[index] = editForm.AverageTemp;
}
stream.Close();
}
private void DeleteFromFileByKey(int key)
{
FileStream stream = new FileStream(fileName, FileMode.Open);
BinaryFormatter bf = new BinaryFormatter();
int count = 0;
int index = 0;
int deletedCount = 0;
while (stream.Position < stream.Length)
{
long startPosition = stream.Position;
AverageTemp obj = (AverageTemp)bf.Deserialize(stream); // восстановление объекта
if (obj.Deleted)
{
deletedCount++;
}
else
{
if (obj.NumDay == key)
{
obj.Deleted = true;
stream.Position = startPosition;
bf.Serialize(stream, obj); // сохранение объекта в потоке f
deletedCount++;
}
index++;
}
count++;
}
if (deletedCount > count / 2)
{
FileStream temp = new FileStream("Temp.bin", FileMode.Create);
stream.Position = 0;
while (stream.Position < stream.Length)
{
AverageTemp obj = (AverageTemp)bf.Deserialize(stream); // восстановление объекта
if (!obj.Deleted)
{
bf.Serialize(temp, obj); // сохранение объекта в потоке f
}
}
temp.Close();
stream.Close();
File.Delete(fileName);
File.Move("Temp.bin", fileName);
File.Delete("Temp.bin");
}
else
{
MessageBox.Show("Запись с указанным ключом не найдена.", "Редактирование по ключу", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
}
stream.Close();
}
private void DeleteFromFileByIndex(int indexForDelete)
{
FileStream stream = new FileStream(fileName, FileMode.Open);
BinaryFormatter bf = new BinaryFormatter();
int count = 0;
int index = 0;
int deletedCount = 0;
while (stream.Position < stream.Length)
{
long startPosition = stream.Position;
AverageTemp obj = (AverageTemp)bf.Deserialize(stream); // восстановление объекта
if (obj.Deleted)
{
deletedCount++;
}
else
{
if (index == indexForDelete)
{
obj.Deleted = true;
stream.Position = startPosition;
bf.Serialize(stream, obj); // сохранение объекта в потоке f
deletedCount++;
}
index++;
}
count++;
}
if (deletedCount > count / 2)
{
FileStream temp = new FileStream("Temp.bin", FileMode.Create);
stream.Position = 0;
while (stream.Position < stream.Length)
{
AverageTemp obj = (AverageTemp)bf.Deserialize(stream); // восстановление объекта
if (!obj.Deleted)
{
bf.Serialize(temp, obj); // сохранение объекта в потоке f
}
}
temp.Close();
stream.Close();
File.Delete(fileName);
File.Move("Temp.bin", fileName);
File.Delete("Temp.bin");
}
stream.Close();
}
/// <summary>
/// Добавление в конец
/// </summary>
/// <param name="averageTemp"></param>
private void AddToEndOfFile(AverageTemp averageTemp)
{
FileStream f1 = new FileStream(fileName, FileMode.OpenOrCreate);
f1.Position = f1.Length;
BinaryFormatter bf = new BinaryFormatter();
bf.Serialize(f1, averageTemp); // сохранение объекта в потоке f
f1.Close();
}
private void EditByKey(int key)
{
FileStream stream = new FileStream(fileName, FileMode.Open);
BinaryFormatter bf = new BinaryFormatter();
AverageTemp obj = null;
int index = 0;
long position = 0;
while (stream.Position < stream.Length)
{
position = stream.Position;
obj = (AverageTemp)bf.Deserialize(stream); // восстановление объекта
if (obj.Deleted)
{
continue;
}
if (obj.NumDay == key)
{
break;
}
index++;
}
if (index < listBox1.Items.Count)
{
EditForm editForm = new EditForm(obj);
DialogResult dr = editForm.ShowDialog();
if (dr == DialogResult.OK)
{
stream.Position = position;
bf.Serialize(stream, editForm.AverageTemp); // сохранение объекта в потоке
listBox1.Items[index] = editForm.AverageTemp;
}
}
else
{
MessageBox.Show("Запись с указанным ключом не найдена.", "Редактирование по ключу", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
}
stream.Close();
}
private double GetAverageTemperature()
{
FileStream stream = new FileStream(fileName, FileMode.OpenOrCreate);
BinaryFormatter bf = new BinaryFormatter();
double average = 0, sum = 0;
int count = 0;
while (stream.Position < stream.Length)
{
AverageTemp d = (AverageTemp)bf.Deserialize(stream); // восстановление объекта
sum = sum + d.Temperature;
count++;
}
stream.Close();
if (count != 0)
{
average = sum / count;
}
return(average);
}
private void LoadFromFile()
{
try
{
listBox1.Items.Clear();
FileStream f2 = new FileStream(fileName, FileMode.OpenOrCreate);
BinaryFormatter bf = new BinaryFormatter();
while (f2.Position < f2.Length)
{
AverageTemp d = (AverageTemp)bf.Deserialize(f2); // восстановление объекта
if (!d.Deleted)
{
listBox1.Items.Add(d);
}
}
f2.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Ошибка при открытии файла", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
public EditForm(AverageTemp averageTemp)
{
InitializeComponent();
txtDayNumber.Text = averageTemp.NumDay.ToString();
txtTemperature.Text = averageTemp.Temperature.ToString();
}
