ASCII 转换帮助类

    /// <summary>
    /// ASCII 帮助类
    /// </summary>
    public static class ASCIIHelper
    {
        /// <summary>
        /// 含中文字符串转ASCII
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string Str2ASCII(String str)
        {
            //这里我们将采用2字节一个汉字的方法来取出汉字的16进制码
            byte[] textbuf = Encoding.Default.GetBytes(str);
            //用来存储转换过后的ASCII码
            string textAscii = string.Empty;

            for (int i = 0; i < textbuf.Length; i++)
            {
                textAscii += textbuf[i].ToString("X");
            }
            return textAscii;
        }

        /// <summary>
        /// ASCII转含中文字符串
        /// </summary>
        /// <param name="textAscii">ASCII字符串</param>
        /// <returns></returns>
        public static string ASCII2Str(string textAscii)
        {

            int k = 0;//字节移动偏移量
            byte[] buffer = new byte[textAscii.Length / 2];//存储变量的字节
            for (int i = 0; i < textAscii.Length / 2; i++)
            {
                //每两位合并成为一个字节
                buffer[i] = byte.Parse(textAscii.Substring(k, 2), System.Globalization.NumberStyles.HexNumber);
                k = k + 2;
            }
            //将字节转化成汉字
            return Encoding.Default.GetString(buffer);
        }
    }