class Program
{
  public static DateTime? Expiration { get; set; }
  public static readonly DateTime DoNotStore = DateTime.MinValue;
  private static readonly DateTime UNIX_EPOCH = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
  private static string DeviceToken = "273eeddaef02192cf4ba5b666453b258f2d2a1ad02f549105fd03fea789d809d";
  public const int DEVICE_TOKEN_BINARY_SIZE = 32;
  public const int DEVICE_TOKEN_STRING_SIZE = 64;
  public const int MAX_PAYLOAD_SIZE = 256;
  private static X509Certificate certificate;
  private static X509CertificateCollection certificates;
  static void Main(string[] args)
  {
   string hostIP = "gateway.sandbox.push.apple.com";//
   int port = 2195;
   string password = "ankejiaoyu";//
   string certificatepath = "aps_developer_identity.p12";//bin/debug
   string p12Filename = System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, certificatepath);
   certificate = new X509Certificate2(System.IO.File.ReadAllBytes(p12Filename), password, X509KeyStorageFlags.MachineKeySet | X509KeyStorageFlags.PersistKeySet | X509KeyStorageFlags.Exportable);
   certificates = new X509CertificateCollection();
   certificates.Add(certificate);
   TcpClient apnsClient = new TcpClient();
   apnsClient.Connect(hostIP, port);
   SslStream apnsStream = new SslStream(apnsClient.GetStream(), false, new RemoteCertificateValidationCallback(validateServerCertificate), new LocalCertificateSelectionCallback(selectLocalCertificate));
   try
   {
    //APNs已不支持SSL 3.0 
    apnsStream.AuthenticateAsClient(hostIP, certificates, System.Security.Authentication.SslProtocols.Tls, false);
   }
   catch (System.Security.Authentication.AuthenticationException ex)
   {
    Console.WriteLine("error+"+ex.Message);
   }
   if (!apnsStream.IsMutuallyAuthenticated)
   {
    Console.WriteLine("error:Ssl Stream Failed to Authenticate！");
   }
   if (!apnsStream.CanWrite)
   {
    Console.WriteLine("error:Ssl Stream is not Writable!");
   }
   Byte[] message = ToBytes();
   apnsStream.Write(message);
  }
  public static byte[] ToBytes()
  {
   // Without reading the response which would make any identifier useful, it seems silly to
   // expose the value in the object model, although that would be easy enough to do. For
   // now we'll just use zero.
   int identifier = 0;
   byte[] identifierBytes = BitConverter.GetBytes(IPAddress.HostToNetworkOrder(identifier));
   // APNS will not store-and-forward a notification with no expiry, so set it one year in the future
   // if the client does not provide it.
   int expiryTimeStamp = -1;//過期時間戳
   if (Expiration != DoNotStore)
   {
    //DateTime concreteExpireDateUtc = (Expiration ?? DateTime.UtcNow.AddMonths(1)).ToUniversalTime();
    DateTime concreteExpireDateUtc = (Expiration ?? DateTime.UtcNow.AddSeconds(20)).ToUniversalTime();
    TimeSpan epochTimeSpan = concreteExpireDateUtc - UNIX_EPOCH;
    expiryTimeStamp = (int)epochTimeSpan.TotalSeconds;
   }
   byte[] expiry = BitConverter.GetBytes(IPAddress.HostToNetworkOrder(expiryTimeStamp));
   byte[] deviceToken = new byte[DeviceToken.Length / 2];
   for (int i = 0; i < deviceToken.Length; i++)
    deviceToken[i] = byte.Parse(DeviceToken.Substring(i * 2, 2), System.Globalization.NumberStyles.HexNumber);
   if (deviceToken.Length != DEVICE_TOKEN_BINARY_SIZE)
   {
    Console.WriteLine("Device token length error！");
   }
   byte[] deviceTokenSize = BitConverter.GetBytes(IPAddress.HostToNetworkOrder(Convert.ToInt16(deviceToken.Length)));
   string str = "{\"aps\":{\"alert\":\"這是測試消息?。",\"badge\":1,\"sound\":\"anke.mp3\"}}";
   byte[] payload = Encoding.UTF8.GetBytes(str);
   byte[] payloadSize = BitConverter.GetBytes(IPAddress.HostToNetworkOrder(Convert.ToInt16(payload.Length)));
   List<byte[]> notificationParts = new List<byte[]>();
   //1 Command
   notificationParts.Add(new byte[] { 0x01 }); // Enhanced notification format command
   notificationParts.Add(identifierBytes);
   notificationParts.Add(expiry);
   notificationParts.Add(deviceTokenSize);
   notificationParts.Add(deviceToken);
   notificationParts.Add(payloadSize);
   notificationParts.Add(payload);
   return BuildBufferFrom(notificationParts);
  }
  private static byte[] BuildBufferFrom(IList<byte[]> bufferParts)
  {
   int bufferSize = 0;
   for (int i = 0; i < bufferParts.Count; i++)
    bufferSize += bufferParts[i].Length;
   byte[] buffer = new byte[bufferSize];
   int position = 0;
   for (int i = 0; i < bufferParts.Count; i++)
   {
    byte[] part = bufferParts[i];
    Buffer.BlockCopy(bufferParts[i], 0, buffer, position, part.Length);
    position += part.Length;
   }
   return buffer;
  }
  private static bool validateServerCertificate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
  {
   return true; // Dont care about server's cert
  }
  private static X509Certificate selectLocalCertificate(object sender, string targetHost, X509CertificateCollection localCertificates,
   X509Certificate remoteCertificate, string[] acceptableIssuers)
  {
   return certificate;
  }
}