RNGCryptoServiceProvider Constructors

Definition

Important

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Initializes a new instance of the RNGCryptoServiceProvider class.

Overloads

RNGCryptoServiceProvider()

Initializes a new instance of the RNGCryptoServiceProvider class.

RNGCryptoServiceProvider(Byte[])

Initializes a new instance of the RNGCryptoServiceProvider class.

RNGCryptoServiceProvider(CspParameters)

Initializes a new instance of the RNGCryptoServiceProvider class with the specified parameters.

RNGCryptoServiceProvider(String)

Initializes a new instance of the RNGCryptoServiceProvider class.

RNGCryptoServiceProvider()

Source:
RNGCryptoServiceProvider.cs
Source:
RNGCryptoServiceProvider.cs
Source:
RNGCryptoServiceProvider.cs

Initializes a new instance of the RNGCryptoServiceProvider class.

public RNGCryptoServiceProvider ();

Examples

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 System;
using System.IO;
using System.Text;
using System.Security.Cryptography;

class RNGCSP
{
    private static RNGCryptoServiceProvider rngCsp = new RNGCryptoServiceProvider();
    // Main method.
    public static void Main()
    {
        const int totalRolls = 25000;
        int[] results = new 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);
        }
        rngCsp.Dispose();
    }

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

    public static byte RollDice(byte numberSides)
    {
        if (numberSides <= 0)
            throw new ArgumentOutOfRangeException("numberSides");

        // Create a byte array to hold the random value.
        byte[] randomNumber = new 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;
    }
}

See also

Applies to

.NET 9 dan versi lain
Produk Versi
.NET Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 2.0, 2.1

RNGCryptoServiceProvider(Byte[])

Source:
RNGCryptoServiceProvider.cs
Source:
RNGCryptoServiceProvider.cs
Source:
RNGCryptoServiceProvider.cs

Initializes a new instance of the RNGCryptoServiceProvider class.

public RNGCryptoServiceProvider (byte[] rgb);

Parameters

rgb
Byte[]

A byte array. This value is ignored.

Remarks

This method does not directly initialize the RNGCryptoServiceProvider class. Calling this method is equivalent to calling the RNGCryptoServiceProvider(CspParameters) constructor and passing null.

See also

Applies to

.NET 9 dan versi lain
Produk Versi
.NET Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 2.0, 2.1

RNGCryptoServiceProvider(CspParameters)

Source:
RNGCryptoServiceProvider.cs
Source:
RNGCryptoServiceProvider.cs
Source:
RNGCryptoServiceProvider.cs

Initializes a new instance of the RNGCryptoServiceProvider class with the specified parameters.

public RNGCryptoServiceProvider (System.Security.Cryptography.CspParameters? cspParams);
public RNGCryptoServiceProvider (System.Security.Cryptography.CspParameters cspParams);

Parameters

cspParams
CspParameters

The parameters to pass to the cryptographic service provider (CSP).

See also

Applies to

.NET 9 dan versi lain
Produk Versi
.NET Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 2.0, 2.1

RNGCryptoServiceProvider(String)

Source:
RNGCryptoServiceProvider.cs
Source:
RNGCryptoServiceProvider.cs
Source:
RNGCryptoServiceProvider.cs

Initializes a new instance of the RNGCryptoServiceProvider class.

public RNGCryptoServiceProvider (string str);

Parameters

str
String

The string input. This parameter is ignored.

Remarks

This method does not directly initialize the RNGCryptoServiceProvider class. Calling this method is equivalent to calling the RNGCryptoServiceProvider(CspParameters) constructor and passing null.

See also

Applies to

.NET 9 dan versi lain
Produk Versi
.NET Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 2.0, 2.1