微信退款证书使用c#

 1 public string get(string data)  2  {  3 string cert = @"D:\certificate\apiclient_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 }