C#String字符串和ASCII码(16进制)的转换

转换方法一：

 //单个ASCII码值转成string字符：
        public static string AsciiToString(int asciiCode)
        {
            if (asciiCode >= 0 && asciiCode <= 255)
            {
                System.Text.ASCIIEncoding asciiEncoding = new System.Text.ASCIIEncoding();
                byte[] byteArray = new byte[] { (byte)asciiCode };
                string strCharacter = asciiEncoding.GetString(byteArray);
                return (strCharacter);
            }
            else
            {
                throw new Exception("ASCII Code is not valid.");
            }
        }
        //字符转ASCII码：
        public static int StringToAsc(string character)
        {
            if (character.Length == 1)
            {
                System.Text.ASCIIEncoding asciiEncoding = new System.Text.ASCIIEncoding();
                int intAsciiCode = (int)asciiEncoding.GetBytes(character)[0];
                return (intAsciiCode);
            }
            else
            {
                throw new Exception("Character is not valid.");
            }

        }

转换方法二：

/// <summary>
        /// 此方法用于将普通字符串转换成16进制的字符串。
        /// </summary>
        /// <param name="_str">要转换的字符串。</param>
        /// <returns></returns>
        public string StringToGBKString(string _str)
        {
            string dt = "";

            byte[] byStr = Encoding.GetEncoding("GB2312").GetBytes(_str);

            foreach (var item in byStr)
            {
                dt += item.ToString("X2");
            }

            return dt;
        }
        
        private string GetStringFromAsciiHex(string input)
        {
            System.Text.ASCIIEncoding asciiEncoding = new System.Text.ASCIIEncoding();
            string acc = "";
            if (input.Length % 2 == 0)
            {
                byte[] bytes = new byte[input.Length / 2];
                for (int i = 0; i < input.Length; i += 2)
                { 
                    string hex = input.Substring(i, 2);
                    bytes[i/2] = Convert.ToByte(hex, 16);
                    
                }
                acc = asciiEncoding.GetString(bytes);

            }
            return acc;
        }