如何利用C#产生随机密码字符串.doc

using System;using System.Security.Cryptography;using System.Text;namespace Utility public class PasswordGenerator public PasswordGenerator() this.Minimum = DefaultMinimum; this.Maximum = DefaultMaximum; this.ConsecutiveCharacters = false; this.RepeatCharacters = true; this.ExcludeSymbols = false; this.Exclusions = null; rng = new RNGCryptoServiceProvider(); protected int GetCryptographicRandomNumber(int lBound, int uBound) / lBound = 0 & lBound = lBound and = xcludeRndBase); return (int)(urndnum % (uBound-lBound) + lBound; protected char GetRandomCharacter() int upperBound = pwdCharArray.GetUpperBound(0); if ( true = this.ExcludeSymbols ) upperBound = PasswordGenerator.UBoundDigit; int randomCharPosition = GetCryptographicRandomNumber(pwdCharArray.GetLowerBound(0), upperBound); char randomChar = pwdCharArrayrandomCharPosition; return randomChar; public string Generate() / minimum maximum int pwdLength = GetCryptographicRandomNumber(this.Minimum, this.Maximum); StringBuilder pwdBuffer = new StringBuilder(); pwdBuffer.Capacity = this.Maximum; / char lastCharacter, nextCharacter; / lastCharacter = nextCharacter = n; for ( int i = 0; i = this.maxSize ) this.maxSize = PasswordGenerator.DefaultMaximum; public int Minimum get return this.minSize; set this.minSize = value; if ( PasswordGenerator.DefaultMinimum this.minSize ) this.minSize = PasswordGenerator.DefaultMinimum; public bool RepeatCharacters get return this.hasRepeating; set this.hasRepeating = value; private const int DefaultMaximum = 10; private const int DefaultMinimum = 6; private const int UBoundDigit = 61; private string exclusionSet; private bool hasConsecutive; private bool hasRepeating; private bool hasSymbols; private int maxSize; private int minSize; private char pwdCharArray = abcdefghijklmnopqrstuvwxyzABCDEFGHIJK