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:certificateapiclient_cert.p12"; //证书位置
            string password = "11100011";//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, 0, 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;
        }