C# encoding format conversion, Url, escape, unicode encoding and decoding

Various types of encoding and decoding methods designed for data manipulation

1 Convert escape encoding, decode Escape

/// <summary>
        /// 转换escape编码
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        private static string Escape(string s)
        {
            StringBuilder sb = new StringBuilder();
            byte[] ba = System.Text.Encoding.Unicode.GetBytes(s);
            for (int i = 0; i < ba.Length; i += 2)
            {    /**/ BE SURE 2's
                sb.Append("%u");
                sb.Append(ba[i + 1].ToString("X2"));
                sb.Append(ba[i].ToString("X2"));
            }
            return sb.ToString();
        }
        /// <summary>
        /// 解码Escape
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string UnEscape(string str)
        {
            if (!string.IsNullOrEmpty(str))
            {
                str = str.Remove(0, 2);//删除最前面两个＂%u＂
                string[] strArr = str.Split(new string[] { "%u" }, StringSplitOptions.None);//以子字符串＂%u＂分隔
                byte[] byteArr = new byte[strArr.Length * 2];
                for (int i = 0, j = 0; i < strArr.Length; i++, j += 2)
                {
                    byteArr[j + 1] = Convert.ToByte(strArr[i].Substring(0, 2), 16);  //把十六进制形式的字串符串转换为二进制字节
                    byteArr[j] = Convert.ToByte(strArr[i].Substring(2, 2), 16);
                }
                str = System.Text.Encoding.Unicode.GetString(byteArr); //把字节转为unicode编码
            }

            return str;
        }

2 unicode encoding, unicode decoding

/// <summary>
        /// unicode编码
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string ToUnicodeString(this string str)
        {
            StringBuilder strResult = new StringBuilder();
            if (!string.IsNullOrEmpty(str))
            {
                for (int i = 0; i < str.Length; i++)
                {
                    strResult.Append("\\u");
                    strResult.Append(((int)str[i]).ToString("x"));
                }
            }
            return strResult.ToString();
        }


        /// <summary>
        /// unicode解码
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string FromUnicodeString(this string str)
        {
            //最直接的方法Regex.Unescape(str);
            StringBuilder strResult = new StringBuilder();
            if (!string.IsNullOrEmpty(str))
            {
                string[] strlist = str.Replace("\\", "").Split('u');
                try
                {
                    for (int i = 1; i < strlist.Length; i++)
                    {
                        int charCode = Convert.ToInt32(strlist[i], 16);
                        strResult.Append((char)charCode);
                    }
                }
                catch (FormatException ex)
                {
                    return Regex.Unescape(str);
                }
            }
            return strResult.ToString();
        }

3 Url encoding and decoding,

string str2 =System.Web.HttpUtility.UrlEncode(str1,Encoding.GetEncoding("GB2312"));//这个是对字符串进行编码

 //string str2 = System.Web.HttpUtility.UrlDecode(str1, Encoding.GetEncoding("GB2312"));