/// <summary>
/// 参数加密
/// </summary>
/// <param name="jsonStr"></param>
/// <returns></returns>
private string EncodeString(string jsonStr)
{
string result = string.Empty;
EncDecUtil encDecUtil = new EncDecUtil();
string key = encDecUtil.encyptData(jsonStr, accesskey);
string sign = encDecUtil.signData(key, accesskey);
result = string.Format("key={0}&sign={1}&clientId={2}",
HttpUtility.UrlEncode(key),
HttpUtility.UrlEncode(sign),
clientId);
return(result);
}