检查这段代码… 我添加了.remove(长度)来改善anaximander的反应

            public string GeneratePassword(int length)
            {
                using(RNGCryptoServiceProvider cryptRNG = new RNGCryptoServiceProvider();)
               {
                      byte[] tokenBuffer = new byte[length];
                      cryptRNG.GetBytes(tokenBuffer);
                      return Convert.ToBase64String(tokenBuffer).Remove(length);
                }
                          
            }

总有system。web。security。membership。GeneratePassword(int length, int numberOfNonAlphanumericCharacters)。

如果你想使用System.Web.Security.Membership.GeneratePassword使用的加密安全随机数生成，但又想将字符集限制为字母数字字符，你可以使用regex过滤结果:

static string GeneratePassword(int characterCount)
{
    string password = String.Empty;
    while(password.Length < characterCount)
        password += Regex.Replace(System.Web.Security.Membership.GeneratePassword(128, 0), "[^a-zA-Z0-9]", string.Empty);
    return password.Substring(0, characterCount);
}

我使用此代码生成密码与字母，数字和非字母数字字符的平衡组合。

public static string GeneratePassword(int Length, int NonAlphaNumericChars)
    {
        string allowedChars = "abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNOPQRSTUVWXYZ0123456789";
        string allowedNonAlphaNum = "!@#$%^&*()_-+=[{]};:<>|./?";
        string pass = "";
        Random rd = new Random(DateTime.Now.Millisecond);
        for (int i = 0; i < Length; i++)
        {
            if (rd.Next(1) > 0 && NonAlphaNumericChars > 0)
            {
                pass += allowedNonAlphaNum[rd.Next(allowedNonAlphaNum.Length)];
                NonAlphaNumericChars--;
            }
            else
            {
                pass += allowedChars[rd.Next(allowedChars.Length)];
            }
        }
        return pass;
    }

这是我快速拼凑的东西。

    public string GeneratePassword(int len)
    {
        string res = "";
        Random rnd = new Random();
        while (res.Length < len) res += (new Func<Random, string>((r) => {
            char c = (char)((r.Next(123) * DateTime.Now.Millisecond % 123)); 
            return (Char.IsLetterOrDigit(c)) ? c.ToString() : ""; 
        }))(rnd);
        return res;
    }

灵感来自@kitsu的回答。但使用RandomNumberGenerator而不是Random或RNGCryptoServiceProvider(在。net 6中已弃用)，并添加了一些特殊字符。

可选参数，用于排除在使用System.Text.Json.JsonSerializer.Serialize时将转义的字符—例如&，它转义为\u0026—以便您可以保证序列化字符串的长度与密码的长度匹配。

适用于。net Core 3.0及以上版本。

public static class PasswordGenerator
{
    const string lower = "abcdefghijklmnopqrstuvwxyz";
    const string upper = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    const string number = "1234567890";
    const string special = "!@#$%^&*()[]{},.:`~_-=+"; // excludes problematic characters like ;'"/\
    const string specialJsonSafe = "!@#$%^*()[]{},.:~_-="; // excludes problematic characters like ;'"/\ and &`+

    const int lowerLength = 26; // lower.Length
    const int upperLength = 26; // upper.Length;
    const int numberLength = 10; // number.Length;
    const int specialLength = 23; // special.Length;
    const int specialJsonSafeLength = 20; // specialJsonSafe.Length;

    public static string Generate(int length = 96, bool jsonSafeSpecialCharactersOnly = false)
    {
        Span<char> result = length < 1024 ? stackalloc char[length] : new char[length].AsSpan();

        for (int i = 0; i < length; ++i)
        {
            switch (RandomNumberGenerator.GetInt32(4))
            {
                case 0:
                    result[i] = lower[RandomNumberGenerator.GetInt32(0, lowerLength)];
                    break;
                case 1:
                    result[i] = upper[RandomNumberGenerator.GetInt32(0, upperLength)];
                    break;
                case 2:
                    result[i] = number[RandomNumberGenerator.GetInt32(0, numberLength)];
                    break;
                case 3:
                    if (jsonSafeSpecialCharactersOnly)
                    {
                        result[i] = specialJsonSafe[RandomNumberGenerator.GetInt32(0, specialJsonSafeLength)];
                    }
                    else
                    {
                        result[i] = special[RandomNumberGenerator.GetInt32(0, specialLength)];
                    }
                    break;
            }
        }

        return result.ToString();
    }
}