Consente di implementare un generatore RNG (Random Number Generator, generatore di numeri casuali) di crittografia mediante l'implementazione fornita dal provider del servizio di crittografia (CSP). Questa classe non può essere ereditata.
Spazio dei nomi: System.Security.Cryptography
Assembly: mscorlib (in mscorlib.dll)

Sintassi
Visual Basic - (Dichiarazione)
<ComVisibleAttribute(True)> _
Public NotInheritable Class RNGCryptoServiceProvider
Inherits RandomNumberGenerator
Dim instance As RNGCryptoServiceProvider
[ComVisibleAttribute(true)]
public sealed class RNGCryptoServiceProvider : RandomNumberGenerator
[ComVisibleAttribute(true)]
public ref class RNGCryptoServiceProvider sealed : public RandomNumberGenerator
/** @attribute ComVisibleAttribute(true) */
public final class RNGCryptoServiceProvider extends RandomNumberGenerator
ComVisibleAttribute(true)
public final class RNGCryptoServiceProvider extends RandomNumberGenerator

Esempio
Nell'esempio di codice riportato di seguito viene illustrato come creare un numero casuale con la classe RNGCryptoServiceProvider.
'The following sample uses the Cryptography class to simulate the roll of a dice.
Imports System
Imports System.IO
Imports System.Text
Imports System.Security.Cryptography
Class RNGCSP
' Main method.
Public Shared Sub Main()
' Roll the dice 30 times and display
' the results to the console.
Dim x As Integer
For x = 0 To 30
Console.WriteLine(RollDice(6))
Next x
End Sub 'Main
' This method simulates a roll of the dice. The input parameter is the
' number of sides of the dice.
Public Shared Function RollDice(NumSides As Integer) As Integer
' Create a byte array to hold the random value.
Dim randomNumber(0) As Byte
' Create a new instance of the RNGCryptoServiceProvider.
Dim Gen As New RNGCryptoServiceProvider()
' Fill the array with a random value.
Gen.GetBytes(randomNumber)
' Convert the byte to an integer value to make the modulus operation easier.
Dim rand As Integer = Convert.ToInt32(randomNumber(0))
' Return the random number mod the number
' of sides. The possible values are zero-
' based, so we add one.
Return rand Mod NumSides + 1
End Function 'RollDice
End Class 'CryptoMemoryStream
//The following sample uses the Cryptography class to simulate the roll of a dice.
using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;
class RNGCSP
{
// Main method.
public static void Main()
{
// Roll the dice 30 times and display
// the results to the console.
for(int x = 0; x <= 30; x++)
Console.WriteLine(RollDice(6));
}
// This method simulates a roll of the dice. The input parameter is the
// number of sides of the dice.
public static int RollDice(int NumSides)
{
// Create a byte array to hold the random value.
byte[] randomNumber = new byte[1];
// Create a new instance of the RNGCryptoServiceProvider.
RNGCryptoServiceProvider Gen = new RNGCryptoServiceProvider();
// Fill the array with a random value.
Gen.GetBytes(randomNumber);
// Convert the byte to an integer value to make the modulus operation easier.
int rand = Convert.ToInt32(randomNumber[0]);
// Return the random number mod the number
// of sides. The possible values are zero-
// based, so we add one.
return rand % NumSides + 1;
}
}
// 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;
int RollDice(int numberSides)
{
// Create a byte array to hold the random value.
array<Byte>^ randomNumber = gcnew array<Byte>(1);
// Create a new instance of the RNGCryptoServiceProvider.
RNGCryptoServiceProvider^ cryptoProvider =
gcnew RNGCryptoServiceProvider();
// Fill the array with a random value.
cryptoProvider->GetBytes(randomNumber);
// Convert the byte to an integer value to make the modulus operation
// easier.
int rand = Convert::ToInt32(randomNumber[0]);
// Return the random number mod the number of sides. The possible
// values are zero-based, so we add one.
return (rand % numberSides) + 1;
}
int main()
{
// Roll the dice 30 times and display
// the results to the console.
for (int i = 0; i <= 30; i++)
{
Console::WriteLine(RollDice(6));
}
}

Gerarchia di ereditarietà

Codice thread safe
I membri statici pubblici (
Shared in Visual Basic) di questo tipo sono validi per le operazioni multithreading. I membri di istanza non sono garantiti come thread safe.

Piattaforme
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile per Pocket PC, Windows Mobile per Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
.NET Framework non supporta tutte le versioni di ciascuna piattaforma. Per un elenco delle versioni supportate, vedere Requisiti di sistema.

Informazioni sulla versione
.NET Framework
Supportato in: 2.0 1.1 1.0
.NET Compact Framework
Supportato in: 2.0

Vedere anche