public CprError CheckDate(string cprTxt)
{
CprError cprError = CprError.NoError;
string date = cprTxt.Substring(0, 6);
string dateyfied = default;
for (int i = 0; i < date.Length; i++)
{
if (i == 2)
{
dateyfied = date.Insert(2, "-");
}
if (i == 4)
{
dateyfied = dateyfied.Insert(5, "-");
}
}
bool validDate = DateTime.TryParse(dateyfied, out DateTime res);
if (!validDate)
{
cprError = CprError.DateError;
//throw new Exception("Date is not valid: " + dateyfied);
}
return(cprError);
}
private CprError Check11Test(string cprTxt)
{
/// <summary>
/// The CPR check sum algorithm is calculated by mulitiplying each digit with a factor
/// and then add all results and divide the sum by 11.
/// Factors: 4327654321
/// CPR: 0609240121
/// Sum: 0 + 18 + 0 + 72 + 12 + 20 + 0 + 1 + 4 + 1 = 121 / 11 = 11.0 -> CPR is OK
/// </summary>
///
CprError cprError = CprError.NoError;
try
{
int sum = 0;
for (int i = 0; i < 3; i++)
{
sum += int.Parse(cprTxt.Substring(i, 1)) * (4 - i);
}
for (int i = 3; i < 10; i++)
{
sum += int.Parse(cprTxt.Substring(i, 1)) * (10 - i);
}
if (sum % 11 != 0)
{
cprError = CprError.Check11Error;
}
}
catch (Exception)
{
cprError = CprError.FormatError;
}
return(cprError);
}
/// <summary>
/// This method validates a danish cpr number.
/// Checks performed:
/// Must contain 10 digits.
/// First 6 digits must be a valid date.
/// The 11-rule (Checksum test)
/// </summary>
/// <param name="cprTxt">a string containing a cprnumber.</param>
/// <param name="error">Indicates type of error if any.</param>
/// <returns>Returns true if no format errors found</returns>
public bool CheckCPR(string cprTxt, out CprError error)
{
CprError cprError = CprError.NoError;
if (allow9)
{
if (cprTxt == "9999999999")
{
error = cprError;
return(true);
}
}
cprError = FormatTest(cprTxt);
if (cprError == CprError.NoError)
{
cprError = DateTest(cprTxt);
}
if (cprError == CprError.NoError)
{
cprError = Check11Test(cprTxt);
}
error = cprError;
return(cprError == CprError.NoError);
}
/// <summary>
/// This method validates a danish cpr number.
/// Checks performed:
/// Must contain 10 digits.
/// First 6 digits must be a valid date.
/// The 11-rule (Checksum test)
/// </summary>
/// <param name="cprTxt">a string containing a cprnumber.</param>
/// <param name="error">Indicates type of error if any.</param>
/// <returns>Returns true if no format errors found</returns>
public static bool CheckCPR(string cprTxt, out CprError error)
{
CprError cprError = FormatTest(cprTxt);
if (cprError == CprError.NoError)
cprError = DateTest(cprTxt);
if (cprError == CprError.NoError)
cprError = Check11Test(cprTxt);
error = cprError;
return (cprError == CprError.NoError);
}
public CprError CheckFormat(string cprTxt)
{
CprError cprError = CprError.NoError;
if (cprTxt.Length != 10)
{
cprError = CprError.FormatError;
//throw new FormatException();
}
return(cprError);
}
private CprError CheckFormat10Test(string cprTxt)
{
CprError cprError = CprError.NoError;
if (cprTxt.Length != 10)
{
cprError = CprError.FormatError;
}
return(cprError);
}
private CprError CheckDateTest(string cprTxt)
{
CprError cprError = CprError.NoError;
try
{
DateTime cprDate = new DateTime(Int32.Parse(cprTxt.Remove(0, 4).Remove(2)), Int32.Parse(cprTxt.Remove(0, 2).Remove(2)), Int32.Parse(cprTxt.Remove(2)));
}
catch (ArgumentOutOfRangeException)
{
cprError = CprError.DateError;
}
return(cprError);
}
public bool Check(string cprTxt, out CprError error)
{
CprError cprError = FormatTest(cprTxt);
if (cprError == CprError.NoError)
{
cprError = DateTest(cprTxt);
}
if (cprError == CprError.NoError)
{
cprError = Check11Test(cprTxt);
}
error = cprError;
return(cprError == CprError.NoError);
}
public bool Check(string cprTxt, out CprError error)
{
DateTime formatedDate;
if (CheckFormat(cprTxt) == CprError.FormatError)
{
error = CprError.FormatError;
return false;
}
if(CheckDate(cprTxt) == CprError.DateError)
{
error = CprError.DateError;
return false;
}
error = Check11Test(cprTxt);
return true;
}
public bool Check(string cprTxt, out CprError error)
{
error = Check11Test(cprTxt);
if (error != CprError.NoError)
{
return(false);
}
error = CheckDateTime(cprTxt);
if (error != CprError.NoError)
{
return(false);
}
error = CheckFormat(cprTxt);
if (error != CprError.NoError)
{
return(false);
}
return(true);
}
/// <summary>
/// The CPR check sum algorithm is calculated by mulitiplying each digit with a factor
/// and then add all results and divide the sum by 11.
/// Factors: 4327654321
/// CPR: 0609240121
/// Sum: 0 + 18 + 0 + 72 + 12 + 20 + 0 + 1 + 4 + 1 = 121 / 11 = 11.0 -> CPR is OK
/// </summary>
///
private CprError Check11Test(string cprTxt)
{
CprError cprError = CprError.NoError;
int sum = 0;
for (int i = 0; i < 3; i++)
{
sum += int.Parse(cprTxt.Substring(i, 1)) * (4 - i);
}
for (int i = 3; i < 10; i++)
{
sum += int.Parse(cprTxt.Substring(i, 1)) * (10 - i);
}
if (sum % 11 != 0)
{
cprError = CprError.Check11Error;
}
return(cprError);
}
public bool Check(string cprTxt, out CprError error)
{
error = CprError.NoError;
if (CheckFormat10Test(cprTxt) != CprError.NoError)
{
error = CprError.FormatError;
}
if (CheckDateTest(cprTxt) != CprError.NoError)
{
error = CprError.DateError;
}
if (Check11Test(cprTxt) != CprError.NoError)
{
error = CprError.Check11Error;
}
return(error == CprError.NoError);
}
private CprError FormatTest(string cprTxt)
{
Regex regExp;
Match match;
string cprFormat = "[0-9]{10}";
CprError cprError = CprError.NoError;
if (cprTxt.Length != 10)
{
cprError = CprError.FormatError;
}
else
{
regExp = new Regex(cprFormat);
match = regExp.Match(cprTxt);
if (!match.Success)
{
cprError = CprError.FormatError;
}
}
return(cprError);
}
public bool Check(string cprTxt, out CprError error)
{
bool validCPR = true;
error = CheckFormat(cprTxt);
if (error != CprError.NoError)
{
validCPR = false;
}
error = CheckDate(cprTxt);
if (error != CprError.NoError)
{
validCPR = false;
}
error = Check11Test(cprTxt);
if (error != CprError.NoError)
{
validCPR = false;
}
return(validCPR);
}
private CprError DateTest(string cprTxt)
{
string dayStr = cprTxt.Substring(0, 2);
string monthStr = cprTxt.Substring(2, 2);
string yearStr = cprTxt.Substring(4, 2);
CprError cprError = CprError.NoError;
int day;
int month;
int year;
try
{
day = int.Parse(dayStr);
month = int.Parse(monthStr);
year = int.Parse(yearStr);
DateTime dt = new DateTime(year, month, day);
}
catch (Exception)
{
cprError = CprError.DateError;
}
return(cprError);
}
private static CprError FormatTest(string cprTxt)
{
Regex regExp;
Match match;
string cprFormat = "[0-9]{10}";
CprError cprError = CprError.NoError;
// Test length
if (cprTxt.Length != 10)
{
cprError = CprError.FormatError;
}
else
{
// Make sure we have 10 digits
regExp = new Regex(cprFormat);
match = regExp.Match(cprTxt);
if (!match.Success)
{
cprError = CprError.FormatError;
}
}
return(cprError);
}
