读写字节数组

public static string GetString(this byte[] buffer, int pos)

    {

      return Encoding.GetEncoding("GBK").GetString(buffer, pos + 2, (int) buffer[pos + 1]);

    }

    public static byte[] WriteString(string String)

    {

      byte[] numArray = new byte[256];

      numArray[0] = (byte) 254;

      numArray[1] = (byte) Encoding.GetEncoding("GBK").GetBytes(String).Length;

      Array.ConstrainedCopy((Array) Encoding.GetEncoding("GBK").GetBytes(String), 0, (Array) numArray, 2, (int) numArray[1]);

      return numArray;

    }