本文整理汇总了VB.NET中System.Security.Cryptography.RNGCryptoServiceProvider.RNGCryptoServiceProvider构造函数的典型用法代码示例。如果您正苦于以下问题：VB.NET RNGCryptoServiceProvider构造函数的具体用法？VB.NET RNGCryptoServiceProvider怎么用？VB.NET RNGCryptoServiceProvider使用的例子？那么恭喜您, 这里精选的构造函数代码示例或许可以为您提供帮助。您也可以进一步了解该构造函数所在类System.Security.Cryptography.RNGCryptoServiceProvider的用法示例。
在下文中一共展示了RNGCryptoServiceProvider构造函数的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的VB.NET代码示例。
示例1: RNGCSP
'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()
Console.ReadLine()
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