C # University Course (fifth edition) after class exercise 17.4 serialization and de-serialization

/*17.4
(Serialization and de-serialization) modifies the previous program so that it can take advantage of class objects that can be serialized and deserialized
*/
Using System;
[Serializable]
Class Classgrade
{
public string Last {get; set;}
public string First {get; set;}
public string Id {get; set;}
public string Class {get; set;}
public string Grade {get; set;}
Public Classgrade ()
{
}
Public Classgrade (String lastName, String firstName,
String ID, String className, string grade)
{
last = LastName;
first = FirstName;
id = ID;
Class = ClassName;
Grade = Grade;
}
}
Using System;
Using System.Windows.Forms;
Using System.IO;
Using System.Runtime.Serialization;
Using System.Runtime.Serialization.Formatters.Binary;
Namespace Grades
{
public partial class Gradesform:form
{
Private FileStream fileinout;
private bool saved = false;
Private BinaryFormatter Formatter;
Public Gradesform ()
{
InitializeComponent ();
Formatter = new BinaryFormatter ();
}
private void Alltextbox_textchanged (object sender, EventArgs e)
{
Enableenterbutton ();
}
private void Saveasbutton_click (object sender, EventArgs e)
{
if (fileinout! = null)
{
Fileinout.close ();
Fileinout = null;
Statuslabel.text = "Closing file";
}
DialogResult result;
String FileName;
using (SaveFileDialog chooser = new SaveFileDialog ())
{
result = Chooser. ShowDialog ();
FileName = Chooser. FileName;
}
if (result = = DialogResult.OK)
{
if (FileName = = string. Empty)
MessageBox.Show ("Invalid file name", "Invalid file name",
MessageBoxButtons.OK, MessageBoxIcon.Information);
Else
{
Fileinout = new FileStream (FileName,
FileMode.OpenOrCreate);
saveasbutton.enabled = false;
Saved = true;
}
Enableenterbutton ();
}
}
private void Enableenterbutton ()
{
if (lasttextbox.text! = string. Empty &&
Firsttextbox.text! = string. Empty &&
Idtextbox.text! = string. Empty &&
Classtextbox.text! = string. Empty &&
Gradetextbox.text! = string. Empty && Saved)
Enterbutton.enabled = true;
Else
enterbutton.enabled = false;
}
private void Enterbutton_click (object sender, EventArgs e)
{
string last = Lasttextbox.text;
string first = Firsttextbox.text;
string id = idtextbox.text;
string className = Classtextbox.text;
string grade = Gradetextbox.text;
Classgrade entry = new Classgrade (last, first, ID,
ClassName, grade);
Formatter. Serialize (fileinout, entry);
Statuslabel.text = "Entry saved";
Lasttextbox.clear ();
Firsttextbox.clear ();
Idtextbox.clear ();
Classtextbox.clear ();
Gradetextbox.clear ();
}
private void Loadbutton_click (object sender, EventArgs e)
{
if (fileinout! = null)
{
Fileinout.close ();
Fileinout = null;
Statuslabel.text = "Closing file";
Saveasbutton.enabled = true;
Saved = false;
}
DialogResult result;
String FileName;
using (OpenFileDialog Filechooser = new OpenFileDialog ())
{
result = Filechooser.showdialog ();
FileName = Filechooser.filename;
}
if (result = = DialogResult.OK)
{

if (FileName = = string. Empty)
MessageBox.Show ("Invalid file name", "Invalid file name",
MessageBoxButtons.OK, MessageBoxIcon.Information);
Else
{
Fileinout = new FileStream (FileName,
FileMode.Open, FileAccess.Read);
Gradestextbox.clear ();
Try
{
while (true)
{
Classgrade entry =
(Classgrade) Formatter. Deserialize (fileinout);
Gradestextbox.appendtext (Formatentry (entry) +
"\ r \ n");
}
}
catch (SerializationException)
{
Statuslabel.text = "File loaded";
}
}
}
}
private String Formatentry (Classgrade fromfile)
{
string result = FromFile.Last.Trim () + "," +
FromFile.First.Trim () + ": \ T" + fromFile.Id.Trim () + "\ T" +
FromFile.Class.Trim () + "\ T" + FromFile.Grade.Trim ();
return result;
}
}
} using System;
Using System.Windows.Forms;
Using System.IO;
Using System.Runtime.Serialization;
Using System.Runtime.Serialization.Formatters.Binary;
Namespace Grades
{
public partial class Gradesform:form
{
Private FileStream fileinout;
private bool saved = false;
Private BinaryFormatter Formatter;
Public Gradesform ()
{
InitializeComponent ();
Formatter = new BinaryFormatter ();
}
private void Alltextbox_textchanged (object sender, EventArgs e)
{
Enableenterbutton ();
}
private void Saveasbutton_click (object sender, EventArgs e)
{
if (fileinout! = null)
{
Fileinout.close ();
Fileinout = null;
Statuslabel.text = "Closing file";
}
DialogResult result;
String FileName;
using (SaveFileDialog chooser = new SaveFileDialog ())
{
result = Chooser. ShowDialog ();
FileName = Chooser. FileName;
}
if (result = = DialogResult.OK)
{
if (FileName = = string. Empty)
MessageBox.Show ("Invalid file name", "Invalid file name",
MessageBoxButtons.OK, MessageBoxIcon.Information);
Else
{
Fileinout = new FileStream (FileName,
FileMode.OpenOrCreate);
saveasbutton.enabled = false;
Saved = true;
}
Enableenterbutton ();
}
}
private void Enableenterbutton ()
{
if (lasttextbox.text! = string. Empty &&
Firsttextbox.text! = string. Empty &&
Idtextbox.text! = string. Empty &&
Classtextbox.text! = string. Empty &&
Gradetextbox.text! = string. Empty && Saved)
Enterbutton.enabled = true;
Else
enterbutton.enabled = false;
}
private void Enterbutton_click (object sender, EventArgs e)
{
string last = Lasttextbox.text;
string first = Firsttextbox.text;
string id = idtextbox.text;
string className = Classtextbox.text;
string grade = Gradetextbox.text;
Classgrade entry = new Classgrade (last, first, ID,
ClassName, grade);
Formatter. Serialize (fileinout, entry);
Statuslabel.text = "Entry saved";
Lasttextbox.clear ();
Firsttextbox.clear ();
Idtextbox.clear ();
Classtextbox.clear ();
Gradetextbox.clear ();
}
private void Loadbutton_click (object sender, EventArgs e)
{
if (fileinout! = null)
{
Fileinout.close ();
Fileinout = null;
Statuslabel.text = "Closing file";
Saveasbutton.enabled = true;
Saved = false;
}
DialogResult result;
String FileName;
using (OpenFileDialog Filechooser = new OpenFileDialog ())
{
result = Filechooser.showdialog ();
FileName = Filechooser.filename;
}
if (result = = DialogResult.OK)
{

if (FileName = = string. Empty)
MessageBox.Show ("Invalid file name", "Invalid file name",
MessageBoxButtons.OK, MessageBoxIcon.Information);
Else
{
Fileinout = new FileStream (FileName,
FileMode.Open, FileAccess.Read);
Gradestextbox.clear ();
Try
{
while (true)
{
Classgrade entry =
(Classgrade) Formatter. Deserialize (fileinout);
Gradestextbox.appendtext (Formatentry (entry) +
"\ r \ n");
}
}
catch (SerializationException)
{
Statuslabel.text = "File loaded";
}
}
}
}
private String Formatentry (Classgrade fromfile)
{
string result = FromFile.Last.Trim () + "," +
FromFile.First.Trim () + ": \ T" + fromFile.Id.Trim () + "\ T" +
FromFile.Class.Trim () + "\ T" + FromFile.Grade.Trim ();
return result;
}
}
}

C # University Course (fifth edition) after class exercise 17.4 serialization and de-serialization