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;
    }

您应该在构造函数中初始化一个类级随机对象，并在每次调用时重用它(这延续了相同的伪随机数序列)。无参数构造函数已经用Environment为生成器播下种子。TickCount内部。

我添加了使用Ranvir溶液选择长度的选项

public static string GenerateRandomString(int length)
    {
        {
            string randomString= string.Empty;

            while (randomString.Length <= length)
            {
                randomString+= Path.GetRandomFileName();
                randomString= randomString.Replace(".", string.Empty);
            }

            return randomString.Substring(0, length);
        }
    }

我的RandomString()方法来生成一个随机字符串。

private static readonly Random _rand = new Random();

/// <summary>
/// Generate a random string.
/// </summary>
/// <param name="length">The length of random string. The minimum length is 3.</param>
/// <returns>The random string.</returns>
public string RandomString(int length)
{
    length = Math.Max(length, 3);

    byte[] bytes = new byte[length];
    _rand.NextBytes(bytes);
    return Convert.ToBase64String(bytes).Substring(0, length);
}

结合“推送码”的答案和使用随机生成器种子的答案。我需要它来创造一系列伪可读的“单词”。

private int RandomNumber(int min, int max, int seed=0)
{
    Random random = new Random((int)DateTime.Now.Ticks + seed);
    return random.Next(min, max);
}

在我的情况下，密码必须包含:

至少有一个小写字母。 至少一个大写字母。 至少有一个小数。 至少一个特殊字符。

这是我的代码:

    private string CreatePassword(int len)
    {
        string[] valid = { "abcdefghijklmnopqrstuvwxyz", "ABCDEFGHIJKLMNOPQRSTUVWXYZ", "1234567890", "!@#$%^&*()_+" };
        RNGCryptoServiceProvider rndGen = new RNGCryptoServiceProvider();

        byte[] random = new byte[len];
        int[] selected = new int[len];

        do
        {
            rndGen.GetNonZeroBytes(random);

            for (int i = 0; i < random.Length; i++)
            {
                selected[i] = random[i] % 4;
            }
        } 
        while(selected.Distinct().Count() != 4);

        rndGen.GetNonZeroBytes(random);

        string res = "";

        for(int i = 0; i<len; i++)
        {
            res += valid[selected[i]][random[i] % valid[selected[i]].Length];
        }
        return res;
    }