RNGCryptoServiceProvider 類別

  • 參考

定義

命名空間:
System.Security.Cryptography
組件:
System.Security.Cryptography.Csp.dll
組件:
System.Security.Cryptography.dll
組件:
mscorlib.dll
組件:
netstandard.dll

警告

RNGCryptoServiceProvider is obsolete. To generate a random number, use one of the RandomNumberGenerator static methods instead.

使用由密碼編譯服務供應者 (CSP) 提供的實作 (implementation)，實作密碼編譯亂數產生器 (RNG)。 此類別無法獲得繼承。

public ref class RNGCryptoServiceProvider sealed : System::Security::Cryptography::RandomNumberGenerator
public ref class RNGCryptoServiceProvider : System::Security::Cryptography::RandomNumberGenerator
public sealed class RNGCryptoServiceProvider : System.Security.Cryptography.RandomNumberGenerator
[System.Obsolete("RNGCryptoServiceProvider is obsolete. To generate a random number, use one of the RandomNumberGenerator static methods instead.", DiagnosticId="SYSLIB0023", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
public sealed class RNGCryptoServiceProvider : System.Security.Cryptography.RandomNumberGenerator
[System.Runtime.InteropServices.ComVisible(true)]
public sealed class RNGCryptoServiceProvider : System.Security.Cryptography.RandomNumberGenerator
public class RNGCryptoServiceProvider : System.Security.Cryptography.RandomNumberGenerator
type RNGCryptoServiceProvider = class
    inherit RandomNumberGenerator
[<System.Obsolete("RNGCryptoServiceProvider is obsolete. To generate a random number, use one of the RandomNumberGenerator static methods instead.", DiagnosticId="SYSLIB0023", UrlFormat="https://aka.ms/dotnet-warnings/{0}")>]
type RNGCryptoServiceProvider = class
    inherit RandomNumberGenerator
[<System.Runtime.InteropServices.ComVisible(true)>]
type RNGCryptoServiceProvider = class
    inherit RandomNumberGenerator
Public NotInheritable Class RNGCryptoServiceProvider
Inherits RandomNumberGenerator
Public Class RNGCryptoServiceProvider
Inherits RandomNumberGenerator
繼承
Object
RandomNumberGenerator
RNGCryptoServiceProvider
屬性
ObsoleteAttribute ComVisibleAttribute

範例

下列程式碼範例示範如何使用 類別建立亂數 RNGCryptoServiceProvider 。

//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();
}

//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;
    }
}

'The following sample uses the Cryptography class to simulate the roll of a dice.
Imports System.IO
Imports System.Text
Imports System.Security.Cryptography



Class RNGCSP
    Private Shared rngCsp As New RNGCryptoServiceProvider()
    ' Main method.
    Public Shared Sub Main()
        Const totalRolls As Integer = 25000
        Dim results(5) As Integer

        ' Roll the dice 25000 times and display
        ' the results to the console.
        Dim x As Integer
        For x = 0 To totalRolls
            Dim roll As Byte = RollDice(System.Convert.ToByte(results.Length))
            results((roll - 1)) += 1
        Next x
        Dim i As Integer

        While i < results.Length
            Console.WriteLine("{0}: {1} ({2:p1})", i + 1, results(i), System.Convert.ToDouble(results(i)) / System.Convert.ToDouble(totalRolls))
            i += 1
        End While
        rngCsp.Dispose()
    End Sub


    ' This method simulates a roll of the dice. The input parameter is the
    ' number of sides of the dice.
    Public Shared Function RollDice(ByVal numberSides As Byte) As Byte
        If numberSides <= 0 Then
            Throw New ArgumentOutOfRangeException("NumSides")
        End If 
        ' Create a byte array to hold the random value.
        Dim randomNumber(0) As Byte
        Do
            ' Fill the array with a random value.
            rngCsp.GetBytes(randomNumber)
        Loop While Not IsFairRoll(randomNumber(0), numberSides)
        ' Return the random number mod the number
        ' of sides.  The possible values are zero-
        ' based, so we add one.
        Return System.Convert.ToByte(randomNumber(0) Mod numberSides + 1)

    End Function


    Private Shared Function IsFairRoll(ByVal roll As Byte, ByVal numSides As Byte) As Boolean
        ' 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.
        Dim fullSetsOfValues As Integer = [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

    End Function 'IsFairRoll
End Class

備註

重要

此型別代表 IDisposable 介面。 當您完成使用型別時，您應該直接或間接處置它。 若要直接處置型別，請呼叫其 try/catch 區塊中的 Dispose 方法。 若要間接處置它，請使用語言建構函式，例如 using (在 C# 中) 或 Using (在 Visual Basic 中)。 如需詳細資訊，請參閱 IDisposable 介面文章中的＜使用實作 IDisposable 的物件＞一節。

建構函式

RNGCryptoServiceProvider()
已過時。

初始化 RNGCryptoServiceProvider 類別的新執行個體。
RNGCryptoServiceProvider(Byte[])
已過時。

初始化 RNGCryptoServiceProvider 類別的新執行個體。
RNGCryptoServiceProvider(CspParameters)
已過時。

使用指定的參數，初始化 RNGCryptoServiceProvider 類別的新執行個體。
RNGCryptoServiceProvider(String)
已過時。

初始化 RNGCryptoServiceProvider 類別的新執行個體。

方法

Dispose()
已過時。

在衍生類別中覆寫時，將目前 RandomNumberGenerator 類別的執行個體所使用的所有資源全部釋出。

(繼承來源 RandomNumberGenerator)
Dispose(Boolean)
已過時。

當在衍生類別中覆寫時，釋放 RandomNumberGenerator 所使用的 Unmanaged 資源，並選擇性釋放 Managed 資源。

(繼承來源 RandomNumberGenerator)
Equals(Object)
已過時。

判斷指定的物件是否等於目前的物件。

(繼承來源 Object)
Finalize()
已過時。

釋放 RNGCryptoServiceProvider 類別所使用的資源。
GetBytes(Byte[])
已過時。

在位元組陣列中填入在密碼編譯方面的強式隨機值序列。
GetBytes(Byte[], Int32, Int32)
已過時。

以密碼編譯強式隨機值序列填入指定位元組陣列，從指定位元組數目的指定索引開始。
GetBytes(Byte[], Int32, Int32)
已過時。

將在密碼編譯方面強式的隨機值序列填入指定的位元組陣列。

(繼承來源 RandomNumberGenerator)
GetBytes(Span<Byte>)
已過時。

填入密碼編譯強式隨機位元組的範圍。
GetBytes(Span<Byte>)
已過時。

填入密碼編譯強式隨機位元組的範圍。

(繼承來源 RandomNumberGenerator)
GetHashCode()
已過時。

做為預設雜湊函式。

(繼承來源 Object)
GetNonZeroBytes(Byte[])
已過時。

在位元組陣列中填入在密碼編譯方面的強式隨機非零值序列。
GetNonZeroBytes(Span<Byte>)
已過時。

填入密碼編譯強式隨機非零值序列位元組的範圍。
GetNonZeroBytes(Span<Byte>)
已過時。

填入密碼編譯強式隨機非零值序列位元組的範圍。

(繼承來源 RandomNumberGenerator)
GetType()
已過時。

取得目前執行個體的 Type。

(繼承來源 Object)
MemberwiseClone()
已過時。

建立目前 Object 的淺層複製。

(繼承來源 Object)
ToString()
已過時。

傳回代表目前物件的字串。

(繼承來源 Object)

適用於

執行緒安全性

此型別具備執行緒安全。

另請參閱