Export (0) Print
Expand All

RNGCryptoServiceProvider Constructor

Initializes a new instance of the RNGCryptoServiceProvider class.

Namespace:  System.Security.Cryptography
Assembly:  mscorlib (in mscorlib.dll)

public:
RNGCryptoServiceProvider()

The following code example shows how to create a random number with the RNGCryptoServiceProvider class.

//The following sample uses the Cryptography class to simulate the roll of a dice. 

using namespace System;
using namespace System::IO;
using namespace System::Text;
using namespace System::Security::Cryptography;

ref class RNGCSP
{
public:
    // Main method. 
    static void Main()
    {
        const int totalRolls = 25000;
        array<int>^ results = gcnew array<int>(6);

        // Roll the dice 25000 times and display 
        // the results to the console. 
        for (int x = 0; x < totalRolls; x++)
        {
            Byte roll = RollDice((Byte)results->Length);
            results[roll - 1]++;
        }
        for (int i = 0; i < results->Length; ++i)
        {
            Console::WriteLine("{0}: {1} ({2:p1})", i + 1, results[i], (double)results[i] / (double)totalRolls);
        }
    }

    // This method simulates a roll of the dice. The input parameter is the 
    // number of sides of the dice. 

    static Byte RollDice(Byte numberSides)
    {
        if (numberSides <= 0)
            throw gcnew ArgumentOutOfRangeException("numberSides");
        // Create a new instance of the RNGCryptoServiceProvider.
        RNGCryptoServiceProvider^ rngCsp = gcnew RNGCryptoServiceProvider();
        // Create a byte array to hold the random value. 
        array<Byte>^ randomNumber = gcnew array<Byte>(1);
        do
        {
            // Fill the array with a random value.
            rngCsp->GetBytes(randomNumber);
        }
        while (!IsFairRoll(randomNumber[0], numberSides));
        // Return the random number mod the number 
        // of sides.  The possible values are zero- 
        // based, so we add one. 
        return (Byte)((randomNumber[0] % numberSides) + 1);
    }

private:
    static bool IsFairRoll(Byte roll, Byte numSides)
    {
        // There are MaxValue / numSides full sets of numbers that can come up 
        // in a single byte.  For instance, if we have a 6 sided die, there are 
        // 42 full sets of 1-6 that come up.  The 43rd set is incomplete. 
        int fullSetsOfValues = Byte::MaxValue / numSides;

        // If the roll is within this range of fair values, then we let it continue. 
        // In the 6 sided die case, a roll between 0 and 251 is allowed.  (We use 
        // < rather than <= since the = portion allows through an extra 0 value). 
        // 252 through 255 would provide an extra 0, 1, 2, 3 so they are not fair 
        // to use. 
        return roll < numSides * fullSetsOfValues;
    }
};

int main()
{
    RNGCSP::Main();
}

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Show:
© 2014 Microsoft