Asp.Net中怎么將字符串與HTML轉換成十進制編碼

using System;
using System.Text.RegularExpressions;
public partial class purchase_property : System.Web.UI.Page
{
 /// <summary>
 /// Asp.Net將字符串轉為16進制區(qū)碼位&#編碼
 /// </summary>
 /// <param name="s">要進行16進制區(qū)碼位編碼的字符串</param>
 /// <returns>編碼后的16進制區(qū)碼位&#字符串</returns>
 public string StringToUnicodeCodeBit(string s)
 {
  if (string.IsNullOrEmpty(s) || s.Trim() == "") return "";
  string r = "";
  for (int i = 0; i < s.Length; i++) r += "&#" + ((int)s[i]).ToString() + ";";
  return r;
 }
 public string reMatchEvaluator(Match m)
 {
  return ((char)int.Parse(m.Groups[1].Value)).ToString();
 }
 /// <summary>
 /// Asp.Net將16進制區(qū)碼位&#編碼轉為對應的字符串
 /// </summary>
 /// <param name="s">16進制區(qū)碼位編碼的字符串</param>
 /// <returns>16進制區(qū)碼位編碼的字符串對應的字符串</returns>
 public string UnicodeCodeBitToString(string s)
 {
  if (string.IsNullOrEmpty(s) || s.Trim() == "") return "";
  Regex rx = new Regex(@"&#(\d+);", RegexOptions.Compiled);
  return rx.Replace(s, reMatchEvaluator);
 }
 protected void Page_Load(object sender, EventArgs e)
 {
  string s = "Asp.Net區(qū)碼位字符串";
  s = StringToUnicodeCodeBit(s);//轉為&#編碼
  Response.Write(s);
  Response.Write("\n");
  s = UnicodeCodeBitToString(s);//&#編碼轉為字符串
  Response.Write(s);
 }
}

function uncode(str) {//把&#編碼轉換成字符
  return str.replace(/&#(x)?([^&]{1,5});?/g, function (a, b, c) {
   return String.fromCharCode(parseInt(c, b ? 16 : 10));
  });
}
function encode(str) {//把字符轉換成&#編碼
  var a = [], i = 0;
  for (; i < str.length; ) a[i] = str.charCodeAt(i++);
  return "&#" + a.join(";&#") + ";";
}