我已经开发了一个随机字符串生成器，但它的行为并不像我所希望的那样。我的目标是能够运行两次，并生成两个不同的四字符随机字符串。但是，它只生成一个四个字符的随机字符串两次。
下面是代码和输出示例:
private string RandomString(int size)
{
StringBuilder builder = new StringBuilder();
Random random = new Random();
char ch;
for (int i = 0; i < size; i++)
{
ch = Convert.ToChar(Convert.ToInt32(Math.Floor(26 * random.NextDouble() + 65)));
builder.Append(ch);
}
return builder.ToString();
}
// get 1st random string
string Rand1 = RandomString(4);
// get 2nd random string
string Rand2 = RandomString(4);
// create full rand string
string docNum = Rand1 + "-" + Rand2;
.．.输出如下:UNTE-UNTE
.．.但它应该看起来像这个UNTE-FWNU
如何确保两个明显随机的字符串?
字符串生成器的另一个版本。简单，没有花哨的数学和神奇的数字。而是用一些神奇的字符串来指定允许的字符。
更新:
我将generator设置为静态的，因此当多次调用时，它将不会返回相同的字符串。然而，此代码不是线程安全的，并且绝对不是加密安全的。
对于密码生成，应该使用System.Security.Cryptography.RNGCryptoServiceProvider。
private Random _random = new Random(Environment.TickCount);
public string RandomString(int length)
{
string chars = "0123456789abcdefghijklmnopqrstuvwxyz";
StringBuilder builder = new StringBuilder(length);
for (int i = 0; i < length; ++i)
builder.Append(chars[_random.Next(chars.Length)]);
return builder.ToString();
}
我创建了这个方法。
效果很好。
public static string GeneratePassword(int Lenght, int NonAlphaNumericChars)
{
string allowedChars = "abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNOPQRSTUVWXYZ0123456789";
string allowedNonAlphaNum = "!@#$%^&*()_-+=[{]};:<>|./?";
Random rd = new Random();
if (NonAlphaNumericChars > Lenght || Lenght <= 0 || NonAlphaNumericChars < 0)
throw new ArgumentOutOfRangeException();
char[] pass = new char[Lenght];
int[] pos = new int[Lenght];
int i = 0, j = 0, temp = 0;
bool flag = false;
//Random the position values of the pos array for the string Pass
while (i < Lenght - 1)
{
j = 0;
flag = false;
temp = rd.Next(0, Lenght);
for (j = 0; j < Lenght; j++)
if (temp == pos[j])
{
flag = true;
j = Lenght;
}
if (!flag)
{
pos[i] = temp;
i++;
}
}
//Random the AlphaNumericChars
for (i = 0; i < Lenght - NonAlphaNumericChars; i++)
pass[i] = allowedChars[rd.Next(0, allowedChars.Length)];
//Random the NonAlphaNumericChars
for (i = Lenght - NonAlphaNumericChars; i < Lenght; i++)
pass[i] = allowedNonAlphaNum[rd.Next(0, allowedNonAlphaNum.Length)];
//Set the sorted array values by the pos array for the rigth posistion
char[] sorted = new char[Lenght];
for (i = 0; i < Lenght; i++)
sorted[i] = pass[pos[i]];
string Pass = new String(sorted);
return Pass;
}
我发现这更有帮助，因为它是一个扩展，它允许您选择代码的源代码。
static string
numbers = "0123456789",
letters = "abcdefghijklmnopqrstvwxyz",
lettersUp = letters.ToUpper(),
codeAll = numbers + letters + lettersUp;
static Random m_rand = new Random();
public static string GenerateCode(this int size)
{
return size.GenerateCode(CodeGeneratorType.All);
}
public static string GenerateCode(this int size, CodeGeneratorType type)
{
string source;
if (type == CodeGeneratorType.All)
{
source = codeAll;
}
else
{
StringBuilder sourceBuilder = new StringBuilder();
if ((type & CodeGeneratorType.Letters) == CodeGeneratorType.Numbers)
sourceBuilder.Append(numbers);
if ((type & CodeGeneratorType.Letters) == CodeGeneratorType.Letters)
sourceBuilder.Append(letters);
if ((type & CodeGeneratorType.Letters) == CodeGeneratorType.LettersUpperCase)
sourceBuilder.Append(lettersUp);
source = sourceBuilder.ToString();
}
return size.GenerateCode(source);
}
public static string GenerateCode(this int size, string source)
{
StringBuilder code = new StringBuilder();
int maxIndex = source.Length-1;
for (int i = 0; i < size; i++)
{
code.Append(source[Convert.ToInt32(Math.Round(m_rand.NextDouble() * maxIndex))]);
}
return code.ToString();
}
public enum CodeGeneratorType { Numbers = 1, Letters = 2, LettersUpperCase = 4, All = 16 };
希望这能有所帮助。
