//对字符进行UrlEncode编码
string text= System.Web.HttpUtility.UrlEncode("heart", System.Text.Encoding.UTF8);　　　　
//对字符进行UrlDecode解码
string data = System.Web.HttpUtility.UrlDecode(text, System.Text.Encoding.UTF8);　

在c#中,HttpUtility.UrlEncode("www+mzwu+com")编码结果为www%2bmzwu%2bcom，在和Java开发的平台做对接的时候，对方用用url编码后再对其进行MD5加密，url编码之后的字符串为大(www%2Bmzwu%2Bcom)写这样加密出来的字符串就.net平台的不匹配，

以下供上方法就是解决HttpUtility.UrlEncode编码由小写转化为大写字母

    /// <summary>
    /// 对字符进行UrlEncode编码
    /// string转Encoding格式
    /// </summary>
    /// <param name="text"></param>
    /// <param name="encod">编码格式</param>
    /// <param name="cap">是否输出大写字母</param>
    /// <returns></returns>
    public static string UrlEncode(string text, Encoding encod, bool cap = true)
      if(cap)
        StringBuilder builder = new StringBuilder();
        foreach (char c in text)
          if (System.Web.HttpUtility.UrlEncode(c.ToString(), encod).Length > 1)
            builder.Append(System.Web.HttpUtility.UrlEncode(c.ToString(), encod).ToUpper());
            builder.Append(c);
        return builder.ToString();
        string encodString = System.Web.HttpUtility.UrlEncode(text, encod);
        return encodString;
    /// <summary>
    /// 对字符进行UrlDecode解码
    /// Encoding转string格式
    /// </summary>
    /// <param name="encodString"></param>
    /// <param name="encod">编码格式</param>
    /// <returns></returns>
    public static string UrlDecode(string encodString, Encoding encod)
      string text = System.Web.HttpUtility.UrlDecode(encodString, encod);
      return text;