csharp 随机密码生成器

Posted 2021-05-12

public static class clsPassGen
{
    public static string GetRandomString(int length)
    {
        const string alphanumericCharacters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

        if (length < 0) return "";
        if (length > int.MaxValue / 8) length = 100;
        var characterArray = alphanumericCharacters.Distinct().ToArray();

        var bytes = new byte[length * 8];
        new RNGCryptoServiceProvider().GetBytes(bytes);
        var result = new char[length];

        for (var i = 0; i < length; i++)
        {
            var value = BitConverter.ToUInt64(bytes, i * 8);
            result[i] = characterArray[value % (uint)characterArray.Length];
        }

        return new string(result);
    }
}