C＃如何更快地运行应用程序

sadfiesch 发表于 Dev

Sadfiesch

我正在创建一个可能的大写字母的单词列表，以证明此代码不安全的8位数字密码会将aaaaaaaa写入aaaaaaab到aaaaaaac等，直到zzzzzzzz使用以下代码为止：

class Program
{
    static string path;
    static int file = 0;
    static void Main(string[] args)
    {
        new_file();
        var alphabet = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ123456789+-*_!$£^=<>§°ÖÄÜöäü.;:,?{}[]";
        var q = alphabet.Select(x => x.ToString());
        int size = 3;
        int counter = 0;

        for (int i = 0; i < size - 1; i++)
        {
            q = q.SelectMany(x => alphabet, (x, y) => x + y);
        }
        foreach (var item in q)
        {
            if (counter >= 20000000)
            {
                new_file();
                counter = 0;
            }
            if (File.Exists(path))
            {
                using (StreamWriter sw = File.AppendText(path))
                {
                    sw.WriteLine(item);
                    Console.WriteLine(item);
                    /*if (!(Regex.IsMatch(item, @"(.)\1")))
                    {
                        sw.WriteLine(item);
                        counter++;
                    }
                    else
                    {
                        Console.WriteLine(item);
                    }*/
                }
            }
            else
            {
                new_file();
            }
        }
    }

    static void new_file()
    {
        path = @"C:\" + "list" + file + ".txt";
        if (!File.Exists(path))
        {
            using (StreamWriter sw = File.CreateText(path))
            {
            }
        }
        file++;
    }
}

该代码运行良好，但需要数周的时间才能运行。有谁知道加快速度的方法，还是我必须等待？如果有人有主意请告诉我。

Serge-Tm

表现：

size 3:   0.02s
size 4:   1.61s
size 5: 144.76s

提示：

删除了LINQ以进行组合生成
删除每个密码的Console.WriteLine
删除了StreamWriter
大缓冲区（128k），用于文件写入

  const string alphabet = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ123456789+-*_!$£^=<>§°ÖÄÜöäü.;:,?{}[]";
  var byteAlphabet = alphabet.Select(ch => (byte)ch).ToArray();
  var alphabetLength = alphabet.Length;

  var newLine = new[] { (byte)'\r', (byte)'\n' };

  const int size = 4;
  var number = new byte[size];
  var password = Enumerable.Range(0, size).Select(i => byteAlphabet[0]).Concat(newLine).ToArray();

  var watcher = new System.Diagnostics.Stopwatch();
  watcher.Start();

  var isRunning = true;
  for (var counter = 0; isRunning; counter++)
  {
    Console.Write("{0}: ", counter);
    Console.Write(password.Select(b => (char)b).ToArray());
    using (var file = System.IO.File.Create(string.Format(@"list.{0:D5}.txt", counter), 2 << 16))
    {
      for (var i = 0; i < 2000000; ++i)
      {
        file.Write(password, 0, password.Length);
        var j = size - 1;
        for (; j >= 0; j--)
        {
          if (number[j] < alphabetLength - 1)
          {
            password[j] = byteAlphabet[++number[j]];
            break;
          }
          else
          {
            number[j] = 0;
            password[j] = byteAlphabet[0];
          }
        }
        if (j < 0)
        {
          isRunning = false;
          break;
        }
      }
    }
  }
  watcher.Stop();
  Console.WriteLine(watcher.Elapsed);
}