ProtocolType Enumeration

ProtocolType Enumeration

 

Specifies the protocols that the Socket class supports.

Namespace:   System.Net.Sockets
Assembly:  System (in System.dll)

public enum ProtocolType

Member nameDescription
Ggp

Gateway To Gateway Protocol.

Icmp

Internet Control Message Protocol.

IcmpV6

Internet Control Message Protocol for IPv6.

Idp

Internet Datagram Protocol.

Igmp

Internet Group Management Protocol.

IP

Internet Protocol.

IPSecAuthenticationHeader

IPv6 Authentication header. For details, see RFC 2292 section 2.2.1, available at http://www.ietf.org.

IPSecEncapsulatingSecurityPayload

IPv6 Encapsulating Security Payload header.

IPv4

Internet Protocol version 4.

IPv6

Internet Protocol version 6 (IPv6).

IPv6DestinationOptions

IPv6 Destination Options header.

IPv6FragmentHeader

IPv6 Fragment header.

IPv6HopByHopOptions

IPv6 Hop by Hop Options header.

IPv6NoNextHeader

IPv6 No next header.

IPv6RoutingHeader

IPv6 Routing header.

Ipx

Internet Packet Exchange Protocol.

ND

Net Disk Protocol (unofficial).

Pup

PARC Universal Packet Protocol.

Raw

Raw IP packet protocol.

Spx

Sequenced Packet Exchange protocol.

SpxII

Sequenced Packet Exchange version 2 protocol.

Tcp

Transmission Control Protocol.

Udp

User Datagram Protocol.

Unknown

Unknown protocol.

Unspecified

Unspecified protocol.

The Socket class uses the ProtocolType enumeration to inform the Windows Sockets API of the requested protocol. Low-level driver software for the requested protocol must be present on the computer for the Socket to be created successfully.

The following example demonstrates how to use ProtocolType to instantiate a Socket.

using System;
using System.Text;
using System.IO;
using System.Net;
using System.Net.Sockets;

public class Sample
{

  public static string DoSocketGet(string server) 
  {
    //Set up variables and String to write to the server.
    Encoding ASCII = Encoding.ASCII;
    string Get = "GET / HTTP/1.1\r\nHost: " + server + 
                 "\r\nConnection: Close\r\n\r\n";
    Byte[] ByteGet = ASCII.GetBytes(Get);
    Byte[] RecvBytes = new Byte[256];
    String strRetPage = null;


    // IPAddress and IPEndPoint represent the endpoint that will
    //   receive the request.
    // Get first IPAddress in list return by DNS.


    try
    {


      // Define those variables to be evaluated in the next for loop and 
      // then used to connect to the server. These variables are defined
      // outside the for loop to make them accessible there after.
      Socket s = null;
      IPEndPoint hostEndPoint;
      IPAddress hostAddress = null;
      int conPort = 80;

      // Get DNS host information.
      IPHostEntry hostInfo = Dns.GetHostEntry(server);
      // Get the DNS IP addresses associated with the host.
      IPAddress[] IPaddresses = hostInfo.AddressList;

      // Evaluate the socket and receiving host IPAddress and IPEndPoint. 
      for (int index=0; index<IPaddresses.Length; index++)
      {
        hostAddress = IPaddresses[index];
        hostEndPoint = new IPEndPoint(hostAddress, conPort);


        // Creates the Socket to send data over a TCP connection.
        s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp );



        // Connect to the host using its IPEndPoint.
        s.Connect(hostEndPoint);

        if (!s.Connected)
        {
          // Connection failed, try next IPaddress.
          strRetPage = "Unable to connect to host";
          s = null;
          continue;
        }

        // Sent the GET request to the host.
        s.Send(ByteGet, ByteGet.Length, 0);


      } // End of the for loop.      



      // Receive the host home page content and loop until all the data is received.
      Int32 bytes = s.Receive(RecvBytes, RecvBytes.Length, 0);
      strRetPage = "Default HTML page on " + server + ":\r\n";
      strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, bytes);

      while (bytes > 0)
      {
        bytes = s.Receive(RecvBytes, RecvBytes.Length, 0);
        strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, bytes);
      }


    } // End of the try block.

    catch(SocketException e) 
    {
      Console.WriteLine("SocketException caught!!!");
      Console.WriteLine("Source : " + e.Source);
      Console.WriteLine("Message : " + e.Message);
    }
    catch(ArgumentNullException e)
    {
      Console.WriteLine("ArgumentNullException caught!!!");
      Console.WriteLine("Source : " + e.Source);
      Console.WriteLine("Message : " + e.Message);
    }
    catch(NullReferenceException e)
    {
      Console.WriteLine("NullReferenceException caught!!!");
      Console.WriteLine("Source : " + e.Source);
      Console.WriteLine("Message : " + e.Message);
    }
    catch(Exception e)
    {
      Console.WriteLine("Exception caught!!!");
      Console.WriteLine("Source : " + e.Source);
      Console.WriteLine("Message : " + e.Message);
    }

    return strRetPage;

}
   public static void Main()
   {
      Console.WriteLine(DoSocketGet("localhost"));
   }
 }

Universal Windows Platform
Available since 10
.NET Framework
Available since 1.1
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.1
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