1 　　　　public string get(string data)  2  　　　　　　{ 3 string cert = @"D:certificateapiclient_cert.p12"; //证书位置 4 string password = "11100011";//证书密码 5 string url = "https://api.mch.weixin.qq.com/secapi/pay/refund";//请求地址 6 ServicePointManager.ServerCertificateValidationCallback=new  7  RemoteCertificateValidationCallback(CheckValidationResult);  8 X509Certificate cer = new X509Certificate(cert, password);  9 HttpWebRequest webrequest = (HttpWebRequest)HttpWebRequest.Create(url); 10  webrequest.ClientCertificates.Add(cer);11 byte[] bs = Encoding.UTF8.GetBytes(data);12 13 webrequest.Method = "POST";14 webrequest.ContentType = "application/x-www-form-urlencoded";15 webrequest.ContentLength = bs.Length;16 //提交请求数据17 Stream reqStream = webrequest.GetRequestStream();18 reqStream.Write(bs, 0, bs.Length);19  reqStream.Close();20 //接收返回的页面，必须的，不能省略21 WebResponse wr = webrequest.GetResponse();22 System.IO.Stream respStream = wr.GetResponseStream();23 System.IO.StreamReader reader = new System.IO.StreamReader(respStream, System.Text.Encoding.GetEncoding("utf-8"));24 string t = reader.ReadToEnd();25  System.Web.HttpContext.Current.Response.Write(t);26  wr.Close();27 28 return t;29 30 31 32  }33 34 private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)35  {36 if (errors == SslPolicyErrors.None)37 return true;38 return false;39 }