微信红包的坑~参数详解和密钥的坑

public static string Post(string url, string param)
        {
            try
            {
                string cert = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "apiclient_cert.p12");
                string password = WxPayConfig.MCHID;
                ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
                X509Certificate cer = new X509Certificate(cert, password);

                HttpWebRequest webrequest = (HttpWebRequest)HttpWebRequest.Create(url);
                webrequest.ClientCertificates.Add(cer);
                webrequest.Method = "post";

                byte[] someBytes = System.Text.Encoding.UTF8.GetBytes(param);
                webrequest.ContentLength = someBytes.Length;
                Stream reqStream = webrequest.GetRequestStream();
                reqStream.Write(someBytes, 0, someBytes.Length);
                reqStream.Close(); //必须要关闭 请求

                HttpWebResponse webreponse = (HttpWebResponse)webrequest.GetResponse();
                Stream stream = webreponse.GetResponseStream();
                string resp = string.Empty;
                using (StreamReader reader = new StreamReader(stream))
                {
                    resp = reader.ReadToEnd();
                }
                return resp;
            }
            catch (Exception e)
            {
                Lind.DDD.Logger.LoggerFactory.Instance.Logger_Info(string.Format("微信红包接口日志：错误代码：{0} {1}", e.Message, e.StackTrace));
                throw;
            }