public override int GetHashCode()
{
int hash = 13;
hash = hash * 7 + Title.GetHashCode();
hash = hash * 7 + Author.GetHashCode();
hash = hash * 7 + ISBN.GetHashCode();
hash = hash * 7 + Publisher.GetHashCode();
hash = hash * 7 + PublishYear.GetHashCode();
hash = hash * 7 + Price.GetHashCode();
hash = hash * 7 + Pages.GetHashCode();
return(hash);
}
/// <summary>
/// Convering book to string with provided format
/// </summary>
public string ToString(string format)
{
if (string.IsNullOrEmpty(format))
{
format = "F";
}
format = format.ToUpper();
switch (format)
{
case "AT":
return(Author + ", " + Title);
case "ATPPY":
return(Author + ", " +
Title + ", " +
Publisher + ", " +
PublishYear.ToString());
case "IAT":
return("ISBN: " + ISBN + ", " +
Author + ", " +
Title);
case "IATPPYPA":
return("ISBN: " + ISBN + ", " +
Author + ", " +
Title + ", " +
Publisher + ", " +
PublishYear + ", " +
Pages.ToString());
case "IATPPYPAPR":
return("ISBN: " + ISBN + ", " +
Author + ", " +
Title + ", " +
Publisher + ", " +
PublishYear.ToString() + ", " +
Pages.ToString() + ", " +
Price.ToString());
case "F":
goto case "IATPPYPAPR";
default:
log.Warn("Wrong format type");
throw new FormatException("Invalid format");
}
}
private void pictureBox2_Click(object sender, EventArgs e)
{
if (SerialNumber.Text == "" || PublishYear.Text == "" || BookName.Text == "")
{
MessageBox.Show("Please enter the required data.");
}
else
{
bool b = false;
FileStream fs = new FileStream("Books.txt", FileMode.OpenOrCreate);
StreamReader sr = new StreamReader(fs);
string[] fields;
string[] records;
while (sr.Peek() != -1)
{
records = sr.ReadLine().Split('#');
for (int i = 0; i < records.Length - 1; i++)
{
fields = records[i].Split('@');
if (fields[1] == BookName.Text)
{
b = true;
}
}
}
sr.Close();
fs.Close();
if (b == false && AutherIDs.SelectedIndex != -1)
{
FileStream File = new FileStream("Books.txt", FileMode.Append, FileAccess.Write);
StreamWriter sw = new StreamWriter(File);
// gets the string value of the combobox
string AuthorId = AutherIDs.SelectedItem.ToString().Trim('\0');
//writes the book using '@' dilimter only if the auther id is valid
sw.Write(SerialNumber.Text);
sw.Write('@');
sw.Write(BookName.Text);
sw.Write('@');
sw.Write(PublishYear.Text);
sw.Write('@');
sw.Write(dic[AuthorId]);
sw.Write('#');
//resets the text boxes
SerialNumber.Clear();
BookName.Clear();
PublishYear.Clear();
AutherIDs.SelectedText = " ";
// Confirms the addition to the user
MessageBox.Show("Book added sucssefully.");
sw.Close();
File.Close();
}
else
{
MessageBox.Show("Book already exists.");
}
}
}
public override int GetHashCode()
{
return(PublishYear.GetHashCode());
}
/// <summary>
/// Returns a string representation of the book, using the specified format.
/// </summary>
/// <param name="format">Avaliable formats:
/// "G" - general
/// "S" - short
/// You can enumerate the components of the book you want to get, separeted by ','.
/// In the result the components values will also be separeted by ','.
/// Components shortcuts:
/// "ISBN" - Books ISBN number
/// "AUT" - Books authors
/// "TT" - Books Title
/// "PB" - Books publisher
/// "PBY" - Books publish year
/// "PG" - Books number of pages
/// "PR" - Books Price
/// Example:
/// The general format looks like this "ISBN,AUT,TT,PB,PBY,PG,PR".
/// The short format "AUT,TT".
/// </param>
/// <param name="formatProvider"></param>
/// <returns></returns>
public string ToString(string format, IFormatProvider formatProvider)
{
string defaultFormat = "G";
if (format == null)
{
format = defaultFormat;
}
if (formatProvider == null)
{
formatProvider = CultureInfo.CurrentCulture;
}
format = format.ToUpper();
string generalFormat =
"ISBN,AUT,TT,PB,PBY,PG,PR";
string shortFormat =
"AUT,TT";
if (format == "G")
{
format = generalFormat;
}
if (format == "S")
{
format = shortFormat;
}
string[] fmtParts = format.Split(',');
StringBuilder result = new StringBuilder();
for (int i = 0; i < fmtParts.Length; i++)
{
if (i != 0)
{
result.Append(", ");
}
switch (fmtParts[i])
{
case "ISBN":
result.Append(ISBN.ToString());
break;
case "AUT":
result.Append(Author.ToString(formatProvider));
break;
case "TT":
result.Append(Title.ToString(formatProvider));
break;
case "PB":
result.Append(Publisher.ToString(formatProvider));
break;
case "PBY":
result.Append(PublishYear.ToString(formatProvider));
break;
case "PG":
result.Append($"P.{NumberOfPages.ToString(formatProvider)}");
break;
case "PR":
result.Append(Price.ToString(formatProvider));
break;
default:
throw new FormatException($"{fmtParts[i]} format is not supported");
}
}
return(result.ToString());
}
