关于微信支付后，回调5次 有没有高手帮忙解决

[qq_16965193]

public static string notice_url()
{
string result = "";
string resultFromWx = getPostStr();
var res = System.Xml.Linq.XDocument.Parse(resultFromWx);

string patha1 = System.Web.HttpRuntime.BinDirectory;
System.IO.StreamWriter loga1 = new System.IO.StreamWriter(patha1 + "SUOYOU.txt", true);
loga1.WriteLine(res);
loga1.Close();

if (res.Element("xml").Element("return_code").Value == "SUCCESS")
{
if (res.Element("xml").Element("result_code").Value == "SUCCESS")
{
string attach = res.Element("xml").Element("attach").Value;
string total_fee_str = res.Element("xml").Element("total_fee").Value;

//存入数据库
DalHelper dbHelper = new DalHelper();
int ss = dbHelper.AjaxInserttotal_fee(System.Convert.ToString(total_fee_str), attach);
if (ss > 0)
{
//告诉微信我知道了，不要再给我发消息了，否则微信会8连击的反馈支付信息
WxPayData Res = new WxPayData();
Res.SetValue("return_code", "SUCCESS");
Res.SetValue("return_msg", "OK");
result = Res.ToXml();


string patha = System.Web.HttpRuntime.BinDirectory;
System.IO.StreamWriter loga = new System.IO.StreamWriter(patha + "resultInfo.txt", true);
loga.WriteLine(result);
loga.Close();
}
}
}
return result;