微信退款证书使用c#

微信退款需要证书

data为已封装好的xml数据

具体怎么封装>打开

 　　　　public string get(string data)
  　　　　　　{
             string cert = @"D:\certificate\apiclient_cert.p12"; //证书位置
             string password = "";//证书密码
             string url = "https://api.mch.weixin.qq.com/secapi/pay/refund";//请求地址
             ServicePointManager.ServerCertificateValidationCallback=new
             RemoteCertificateValidationCallback(CheckValidationResult);
             X509Certificate cer = new X509Certificate(cert, password);
             HttpWebRequest webrequest = (HttpWebRequest)HttpWebRequest.Create(url);
             webrequest.ClientCertificates.Add(cer);
             byte[] bs = Encoding.UTF8.GetBytes(data);

             webrequest.Method = "POST";
             webrequest.ContentType = "application/x-www-form-urlencoded";
             webrequest.ContentLength = bs.Length;
             //提交请求数据
             Stream reqStream = webrequest.GetRequestStream();
             reqStream.Write(bs, , bs.Length);
             reqStream.Close();
             //接收返回的页面，必须的，不能省略
             WebResponse wr = webrequest.GetResponse();
             System.IO.Stream respStream = wr.GetResponseStream();
             System.IO.StreamReader reader = new System.IO.StreamReader(respStream, System.Text.Encoding.GetEncoding("utf-8"));
             string t = reader.ReadToEnd();
             System.Web.HttpContext.Current.Response.Write(t);
             wr.Close();

             return t;

             }

         private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
         {
             if (errors == SslPolicyErrors.None)
                 return true;
             return false;
         }