註冊一個外國的網站，註冊驗證的資訊為八進位制數值的字串形式，需要解碼一下才能知道驗證的問題。因此寫了一個小工具來轉換。如下：

八進位制數值字串：形式如：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace RegDecode_V1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btn_Decode_Click(object sender, EventArgs e)
        {
            txt_DES.Text = "";
            txt_SRC.Text = txt_SRC.Text.Trim();     //去首尾的空格
            Byte[] numbers = asciiToString(txt_SRC.Text);
            txt_DES.Text = Encoding.ASCII.GetString(numbers);
        }

        public Byte [] asciiToString(string value)          //轉換成ASCII碼
        {
            Byte[] nums = new Byte[200];
            string[] chars = value.Split(' ');      //空格間隔的
            for (int i = 0; i < chars.Length; i++)
            {
                nums[i] = Convert.ToByte(chars[i], 8);
            }
            return nums;
        }

        private void btn_Encode_Click(object sender, EventArgs e)
        {
            txt_SRC.Text = "";
            string[] strEncode = StringToOctal(txt_DES.Text.Trim());
            for(int j=0;j<strEncode.Length;j++)
            {
                if(strEncode[j]!=null)
                {
                    txt_SRC.Text += strEncode[j];
                    txt_SRC.Text += " ";
                }
                txt_SRC.Text = txt_SRC.Text;
            }


        }

        public string[] StringToOctal(string value)         //轉換成三位的八進位制字串陣列
        {
            string[] strs = new string[200];
            char[] chars = value.ToCharArray();
            for (int i = 0; i < value.Length; i++)
            {
                strs[i] = Convert.ToString(chars[i], 8);
                strs[i] = strs[i].PadLeft(3, '0');
            }
            strs[value.Length] = null;
            return strs;
        }
    }
}
 

執行的效果如下：

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