取得编码后的HTTP字符串

        /// <summary>
        ///  取得编码后的字符串
        /// </summary>
        /// <param name="strValue"></param>
        /// <returns></returns>
        public static string GetUrlEncode(string strValue)
        {
           string strUrl = HttpUtility.UrlEncode(strValue);
           strUrl =strUrl.Replace("+", "%20"); 
           return strUrl;
        }