1 public static string HttpPost(string url, string param = null) 2  { 3  HttpWebRequest request; 4  5 //如果是发送HTTPS请求  6 if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase)) 7  { 8 ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls; //协议按需选择， 9 ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);10 request = WebRequest.Create(url) as HttpWebRequest;11 request.ProtocolVersion = HttpVersion.Version10;12 13  }14 else15  {16 request = WebRequest.Create(url) as HttpWebRequest;17  }18 19 request.Method = "POST";20 request.ContentType = "application/json";21 request.Accept = "*/*";22 request.Timeout = 15000; 23 request.AllowAutoRedirect = false;24 //查找我们导入的证书25 X509Store certStore = new X509Store(StoreName.My, StoreLocation.LocalMachine);26  certStore.Open(OpenFlags.ReadOnly);27 var aa = certStore.Certificates;28 X509Certificate2Collection certCollection = certStore.Certificates.Find(X509FindType.FindBySubjectName, "www.xxx.com", false);29 request.ClientCertificates.Add(certCollection[0]);30 31 32 StreamWriter requestStream = null;33 WebResponse response = null;34 string responseStr = null;35 36 try37  {38 requestStream = new StreamWriter(request.GetRequestStream());39  requestStream.Write(param);40  requestStream.Close();41 42 response = request.GetResponse();43 if (response != null)44  {45 StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);46 responseStr = reader.ReadToEnd();47  reader.Close();48  }49  }50 catch (Exception)51  {52 throw;53  }54 finally55  {56 request = null;57 requestStream = null;58 response = null;59  }60 61 return responseStr;62  }63 64 65 private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)66  {67 return true; //总是接受 68 } 

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第一步导入证书：

a、运行输入“mmc”

 b、在控制台中点击“文件”——>“添加/删除管理单元”，在弹出框中依次选择“证书”-“添加”-“”-“确定”

上图点击“添加”弹出框选择“计算机账户”，一直下一步到完成。

c、证书导入，“证书”右键 选择“所有任务”，点击“导入“。

 d、证书授权

 1、工具下载 安装winhttpcertcfg.msi 下载地址 https://www.microsoft.com/en-us/download/details.aspx?id=19801。

 2、到winhttpcertcfg安装目录运行如下命令提升账户访问权限：WinHttpCertCfg.exe -g -c LOCAL_MACHINE\MY -s "证书名" -a  "NETWORK SERVICE"。

      说明：-s  证书名（如：www.xxxx.com） ；-a 授权用户

 3、如果你的IIS是7.0，需要设置网站应用池标识（如图）。

4、重启IIS