RNGCryptoServiceProvider.GetBytes メソッド
アセンブリ: mscorlib (mscorlib.dll 内)




RNGCryptoServiceProvider クラスを使用して乱数を作成する方法を次のコード例に示します。
'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)); } }

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