httpclient方式

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

ServicePointManager.ServerCertificateValidationCallback += RemoteCertificateValidate;

private static bool RemoteCertificateValidate(object sender, X509Certificate cert, X509Chain chain, SslPolicyErrors error)
return true;

HttpWebRequest 方式

string host = @" https://localhost/ ";
string certName = @"C:\temp\cert.pfx";
string password = @"password";

X509Certificate2Collection certificates = new X509Certificate2Collection();
certificates.Import(certName, password, X509KeyStorageFlags.MachineKeySet | X509KeyStorageFlags.PersistKeySet);

ServicePointManager.ServerCertificateValidationCallback = (a, b, c, d) => true;
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(host);
req.AllowAutoRedirect = true;
req.ClientCertificates = certificates;
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
string postData = "login-form-type=cert";
byte[] postBytes = Encoding.UTF8.GetBytes(postData);
req.ContentLength = postBytes.Length;
Stream postStream = req.GetRequestStream();
postStream.Write(postBytes, 0, postBytes.Length);
postStream.Flush();
postStream.Close();
WebResponse resp = req.GetResponse();
Stream stream = resp.GetResponseStream();
using (StreamReader reader = new StreamReader(stream))
    string line = reader.ReadLine();
    while (line != null)
        Console.WriteLine(line);
        line = reader.ReadLine();
stream.Close();
catch(Exception e)

Console.WriteLine(e);

restsharp方式
var client = new RestClient(url);
ServicePointManager.Expect100Continue = true;

ServicePointManager.DefaultConnectionLimit = 9999;

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12 | SecurityProtocolType.Ssl3;
var certFile = Path.Combine(certificateFolder, "certificate.pfx");

X509Certificate2 certificate = new X509Certificate2(certFile, onboard.authentication.secret);

client.ClientCertificates = new X509CertificateCollection() { certificate };

client.Proxy = new WebProxy();

var restrequest = new RestRequest(Method.POST);

restrequest.AddHeader("Cache-Control", "no-cache");

restrequest.AddHeader("Accept", "application/json");

restrequest.AddHeader("Content-Type", "application/json");

restrequest.AddParameter("myStuff", ParameterType.RequestBody);

IRestResponse response = client.Execute(restrequest);
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