public override string ToString()
{
if (String.IsNullOrEmpty(ISBN) || String.IsNullOrEmpty(Author) || String.IsNullOrEmpty(Name) || String.IsNullOrEmpty(Publisher))
{
return(base.ToString());
}
return(ISBN + Author + Name + Publisher + Year + Pagesquantity.ToString() + Price.ToString());
}
public string ToString(string format, IFormatProvider provider)
{
if (String.IsNullOrEmpty(format))
{
format = "G";
}
if (provider == null)
{
provider = CultureInfo.CurrentCulture;
}
switch (format.ToUpperInvariant())
{
case "AN":
return($"AuthorName: {Author}, Title: {Name}");
case "ANPY":
return($"AuthorName: {Author}, Title: {Name}, Publisher: {Publisher}, Year: {Year.ToString(provider)}");
case "IANPYP":
return($"ISBN 13: {ISBN}, AuthorName: {Author}, Title: {Name}, Publisher: {Publisher}, Year: {Year.ToString(provider)}, Price: {Price.ToString(provider)}");
case "ANPP":
return($"AuthorName: {Author}, Title: {Name}, Publisher: {Publisher}, Price: {Price.ToString(provider)}");
case "G":
return($"ISBN 13: {ISBN}, AuthorName: {Author}, Title: {Name}, Publisher: {Publisher}, Year: {Year.ToString(provider)}, Number of pages: {Pagesquantity.ToString(provider)}, Price: {Price.ToString(provider)}");
default:
throw new FormatException(String.Format("The {0} format string is not supported.", format));
}
}
