I'm very much a vb person, but have had to use this id number class in c#. I got it from http://www.codingsanity.com/idnumber.htm :
using System;
using System.Text.RegularExpressions;
namespace Utilities.SouthAfrica
{
/// <summary>
/// Represents a South African Identity Number.
/// valid number = 7707215230080
/// invalid test number = 1234567891234
///
/// </summary>
[Serializable()]
public class IdentityNumber
{
#region Enumerations
/// <summary>
/// Indicates a gender.
/// </summary>
public enum PersonGender
{
Female = 0,
Male = 5
}
public enum PersonCitizenship
{
SouthAfrican = 0,
Foreign = 1
}
#endregion
#region Declarations
static Regex _expression;
Match _match;
const string _IDExpression = @"(?<Year>[0-9][0-9])(?<Month>([0][1-9])|([1][0-2]))(?<Day>([0-2][0-9])|([3][0-1]))(?<Gender>[0-9])(?<Series>[0-9]{3})(?<Citizenship>[0-9])(?<Uniform>[0-9])(?<Control>[0-9])";
#endregion
#region Constuctors
/// <summary>
/// Sets up the shared objects for ID validation.
/// </summary>
static IdentityNumber()
{
_expression =
new Regex(_IDExpression, RegexOptions.Compiled | RegexOptions.Singleline);
}
/// <summary>
/// Creates the ID number from a string.
/// </summary>
/// <param name="IDNumber">The string ID number.</param>
public IdentityNumber(string IDNumber)
{
_match = _expression.Match(IDNumber.Trim());
}
#endregion
#region Properties
/// <summary>
/// Indicates the date of birth encoded in the ID Number.
/// </summary>
/// <exception cref="System.ArgumentException">Thrown if the ID Number is not usable.</exception>
public DateTime DateOfBirth
{
get
{
if(IsUsable == false)
{
throw
new ArgumentException("ID Number is unusable!", "IDNumber");
}
int year = int.Parse(_match.Groups["Year"].Value);
// NOTE: Do not optimize by moving these to static, otherwise the calculation may be incorrect
// over year changes, especially century changes.
int currentCentury = int.Parse(DateTime.Now.Year.ToString().Substring(0, 2) + "00");
int lastCentury = currentCentury - 100;
int currentYear = int.Parse(DateTime.Now.Year.ToString().Substring(2, 2));
// If the year is after or at the current YY, then add last century to it, otherwise add
// this century.
// TODO: YY -> YYYY logic needs thinking about
if(year > currentYear)
{
year += lastCentury;
}
else
{
year += currentCentury;
}
return
new DateTime(year, int.Parse(_match.Groups["Month"].Value), int.Parse(_match.Groups["Day"].Value));
}
}
/// <summary>
/// Indicates the gender for the ID number.
/// </summary>
/// <exception cref="System.ArgumentException">Thrown if the ID Number is not usable.</exception>
public PersonGender Gender
{
get
{
if(IsUsable == false)
{
throw
new ArgumentException("ID Number is unusable!", "IDNumber");
}
int gender = int.Parse(_match.Groups["Gender"].Value);
if(gender < (int) PersonGender.Male)
{
return PersonGender.Female;
}
else
{
return PersonGender.Male;
}
}
}
/// <summary>
/// Indicates the citizenship for the ID number.
/// </summary>
/// <exception cref="System.ArgumentException">Thrown if the ID Number is not usable.</exception>
public PersonCitizenship Citizenship
{
get
{
if(IsUsable == false)
{
throw
new ArgumentException("ID Number is unusable!", "IDNumber");
}
return (PersonCitizenship) Enum.Parse(typeof(PersonCitizenship), _match.Groups["Citizenship"].Value);
}
}
/// <summary>
/// Indicates if the IDNumber is usable or not.
/// </summary>
public bool IsUsable
{
get
{
return _match.Success;
}
}
/// <summary>
/// Indicates if the IDNumber is valid or not.
/// </summary>
public bool IsValid
{
get
{
if(IsUsable == true)
{
// Calculate total A by adding the figures in the odd positions i.e. the first, third, fifth,
// seventh, ninth and eleventh digits.
int a = int.Parse(_match.Value.Substring(0, 1)) + int.Parse(_match.Value.Substring(2, 1)) + int.Parse(_match.Value.Substring(4, 1)) + int.Parse(_match.Value.Substring(6, 1)) + int.Parse(_match.Value.Substring(8, 1)) + int.Parse(_match.Value.Substring(10, 1));
// Calculate total B by taking the even figures of the number as a whole number, and then
// multiplying that number by 2, and then add the individual figures together.
int b = int.Parse(_match.Value.Substring(1, 1) + _match.Value.Substring(3, 1) + _match.Value.Substring(5, 1) + _match.Value.Substring(7, 1) + _match.Value.Substring(9, 1) + _match.Value.Substring(11, 1));
b *= 2;
string bString = b.ToString();
b = 0;
for(int index = 0; index < bString.Length; index++)
{
b += int.Parse(bString.Substring(index, 1));
}
// Calculate total C by adding total A to total B.
int c = a + b;
// The control-figure can now be determined by subtracting the ones in figure C from 10.
string cString = c.ToString() ;
cString = cString.Substring(cString.Length - 1, 1) ;
int control = 0;
// Where the total C is a multiple of 10, the control figure will be 0.
if(cString != "0")
{
control = 10 - int.Parse(cString.Substring(cString.Length - 1, 1));
}
if(_match.Groups["Control"].Value == control.ToString())
{
return true;
}
}
return false;
}
}
#endregion
}
}
Here is the code from my default.aspx.cs page:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Utilities.Southafrica; <- this is the one i added to
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
var someNumber =
new IdentityNumber("123456"); <- gives error
}
}
Can someone please tell the syntax for how I pass an id number to the class?
Thanks
