how to add a definition to a BigInteger class in System.Numerics.BigInteger

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HI i am a newbee in coding with c#. presently coding RSA-1024 algorithm using BigInteger class from System.Numerics.BigInteger, where now i need a function to generate random prime numbers. i am using visual studio 4.0. i have the BigInteger class but no defintion for the generating prime. i have a function defintion for it, all i need is to add into that BigInteger class in System.Numerics

can anyone help with this
thanks in advance

Posted 19-Nov-13 0:02am

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phil.o · Accepted Answer · 2013-11-19T00:10:00

You cannot directly modify the base Biginteger class.

But, you can create an extension method on this class ; this way:

C#

using System.Numerics;

public static class Extensions
{
   public static int GenerateRandomPrimeNumber(this Biginteger bi)
   {
      // Your logic goes here
   }
}

For the usage:

C#

Biginteger bi = BigInteger.Zero;
int myPrime = bi.GenerateRandomPrimeNumber();

Warning: extension methods work on instances, that's why I had to declare a BigInteger variable to get access to the GetRandomPrimeNumber() extension method. You cannot create a static method on the class itself if you do not have the original source code and can recompile.