/// <summary>
/// 生成要请求给支付宝的参数数组
/// </summary>
/// <param name="sParaTemp">请求前的参数数组</param>
/// <param name="code">字符编码</param>
/// <returns>要请求的参数数组字符串</returns>
private static string BuildRequestParaToString(SortedDictionary <string, string> sParaTemp, Encoding code)
{
//待签名请求参数数组
Dictionary <string, string> sPara = new Dictionary <string, string>();
sPara = BuildRequestPara(sParaTemp);
//把参数组中所有元素，按照“参数=参数值”的模式用“&”字符拼接成字符串，并对参数值做urlencode
string strRequestData = AlipayCore.CreateLinkStringUrlencode(sPara, code);
return(strRequestData);
}