public void TryParseTests(string input, string expected, ISBN10.ResultCode resultCode)
{
var result = ISBN10.TryParse(input, out var isbn10);
result.Should().Be(resultCode);
if (resultCode == ISBN10.ResultCode.Success)
{
isbn10.ISBN10Code.Should().Be(expected);
}
else
{
isbn10.Should().Be(ISBN10.Empty);
}
}
public static ResultCode TryParse(string isbn, out ISBN10 value)
{
if (string.IsNullOrWhiteSpace(isbn))
{
value = Empty;
return(ResultCode.Invalid);
}
isbn = isbn.Trim();
if (isbn.Length != 10)
{
value = Empty;
return(ResultCode.InvalidNumberOfDigits);
}
int sum = 0;
for (int i = 0; i < 9; i++)
{
if (!int.TryParse(isbn[i].ToString(), out var digit))
{
value = Empty;
return(ResultCode.InvalidNotAValidNumber);
}
sum += (i + 1) * digit;
}
int remainder = sum % 11;
if (remainder == 10)
{
if (isbn[9] == 'X')
{
value = new ISBN10(isbn, 10);
return(ResultCode.Success);
}
}
var validChecksum = isbn[9] == (char)('0' + remainder);
if (!validChecksum)
{
value = Empty;
return(ResultCode.InvalidChecksum);
}
value = new ISBN10(isbn, remainder);
return(ResultCode.Success);
}
public void ConvertISBN10ToEan13Examples()
{
//Convert to Ean13 directly
if (Ean13.TryConvertFomISBN10("0306406152", out var ean13) == Ean13.ResultCode.Success)
{
Console.WriteLine($"Convert ISBN10 from string; Ean13: {ean13.Ean13Code} Checksum: {ean13.Checksum}");
}
//Pass an ISBN10 struct
if (ISBN10.TryParse("0306406152", out var isbn10) == ISBN10.ResultCode.Success)
{
if (Ean13.TryConvertFomISBN10(isbn10, out ean13) == Ean13.ResultCode.Success)
{
Console.WriteLine($"Convert ISBN10 from struct; Ean13: {ean13.Ean13Code} Checksum: {ean13.Checksum}");
}
}
}
public void ISBN10Examples()
{
//Validate an ISBN10
if (ISBN10.TryParse("0306406152", out var isbn10) == ISBN10.ResultCode.Success)
{
Console.WriteLine($"Code: {isbn10.ISBN10Code} Checksum: {isbn10.Checksum}");
//: Code: 0306406152 Checksum: 2
}
// ISBN10 with an invalid checksum
var invalidChecksumInput = "0306406150";
var parseResultCode = ISBN10.TryParse(invalidChecksumInput, out isbn10);
Console.WriteLine($"Parse result for {invalidChecksumInput} is {parseResultCode}");
//: Parse result for 0306406150 is InvalidChecksum
}
/// <summary>
/// Processes the specified ISBN.
/// </summary>
/// <param name="isbn">The ISBN to process.</param>
/// <returns>The <see cref="IISBN"/> generated.</returns>
static IISBN ProcessISBN(string isbn)
{
IISBN ret = null;
try
{
if (isbn.Length == 10)
{
ret = new ISBN10(isbn);
}
else if (isbn.Length == 13)
{
ret = new ISBN13(isbn);
}
}
catch { } // don't care
return(ret);
}
public static ISBN13 From(ISBN10 isbn)
{
string newIsbn = "978-" + isbn;
var clearIsbn = Regex.Replace(newIsbn, "-", "");
var digits = clearIsbn
.Select(x => x == 'X' ? 0 : int.Parse(x.ToString()))
.ToArray();
int checksum = 0;
for (int i = 0; i < 12; i++)
{
checksum += (i + 1) % 2 != 0 ? digits[i] : digits[i] * 3;
}
checksum %= 10;
checksum = checksum > 0 ? 10 - checksum : 0;
newIsbn = newIsbn.Substring(0, newIsbn.Length - 1) + checksum.ToString();
return(new ISBN13(newIsbn));
}
public void TryParsePropertyTestNoExceptions(NonEmptyString input)
{
ISBN10.TryParse(input.Get, out _);
}
public void FromISBN10Test(string isbn10Str, long expected)
{
ISBN10.TryParse(isbn10Str, out var isbn10);
Ean13.TryConvertFomISBN10(isbn10, out var ean13).Should().Be(Ean13.ResultCode.Success);
ean13.Ean13Code.Should().Be(expected);
}
