MulticastOption Clase

Definición

Espacio de nombres:

System.Net.Sockets

Ensamblado:

System.Net.Sockets.dll

Source:

MulticastOption.cs

Contiene los valores de IPAddress usados para unirse y separarse de un grupo de multidifusión.

C#

public class MulticastOption

Herencia

Object

MulticastOption

Ejemplos

Los ejemplos siguientes unen la interfaz IP predeterminada a un grupo de multidifusión IP. Asumen la dirección del grupo de multidifusión IP en el intervalo 224.0.0.0 a 239.255.255.255.

C#

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

// This is the listener example that shows how to use the MulticastOption class.
// In particular, it shows how to use the MulticastOption(IPAddress, IPAddress)
// constructor, which you need to use if you have a host with more than one
// network card.
// The first parameter specifies the multicast group address, and the second
// specifies the local address of the network card you want to use for the data
// exchange.
// You must run this program in conjunction with the sender program as
// follows:
// Open a console window and run the listener from the command line.
// In another console window run the sender. In both cases you must specify
// the local IPAddress to use. To obtain this address run the ipconfig command
// from the command line.
//
namespace Mssc.TransportProtocols.Utilities
{
    public class TestMulticastOption
    {
        private static IPAddress s_mcastAddress;
        private static int s_mcastPort;
        private static Socket s_mcastSocket;
        private static MulticastOption s_mcastOption;

        private static void MulticastOptionProperties()
        {
            Console.WriteLine("Current multicast group is: " + s_mcastOption.Group);
            Console.WriteLine("Current multicast local address is: " + s_mcastOption.LocalAddress);
        }

        private static void StartMulticast()
        {
            try
            {
                s_mcastSocket = new Socket(AddressFamily.InterNetwork,
                                         SocketType.Dgram,
                                         ProtocolType.Udp);

                Console.Write("Enter the local IP address: ");

                IPAddress localIPAddr = IPAddress.Parse(Console.ReadLine());

                //IPAddress localIP = IPAddress.Any;
                EndPoint localEP = (EndPoint)new IPEndPoint(localIPAddr, s_mcastPort);

                s_mcastSocket.Bind(localEP);


                // Define a MulticastOption object specifying the multicast group
                // address and the local IPAddress.
                // The multicast group address is the same as the address used by the server.
                s_mcastOption = new MulticastOption(s_mcastAddress, localIPAddr);

                s_mcastSocket.SetSocketOption(SocketOptionLevel.IP,
                                            SocketOptionName.AddMembership,
                                            s_mcastOption);
            }

            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
            }
        }

        private static void ReceiveBroadcastMessages()
        {
            bool done = false;
            byte[] bytes = new byte[100];
            IPEndPoint groupEP = new(s_mcastAddress, s_mcastPort);
            EndPoint remoteEP = (EndPoint)new IPEndPoint(IPAddress.Any, 0);

            try
            {
                while (!done)
                {
                    Console.WriteLine("Waiting for multicast packets.......");
                    Console.WriteLine("Enter ^C to terminate.");

                    s_mcastSocket.ReceiveFrom(bytes, ref remoteEP);

                    Console.WriteLine("Received broadcast from {0} :\n {1}\n",
                      groupEP.ToString(),
                      Encoding.ASCII.GetString(bytes, 0, bytes.Length));
                }

                s_mcastSocket.Close();
            }

            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
            }
        }

        public static void Main(string[] args)
        {
            // Initialize the multicast address group and multicast port.
            // Both address and port are selected from the allowed sets as
            // defined in the related RFC documents. These are the same
            // as the values used by the sender.
            s_mcastAddress = IPAddress.Parse("224.168.100.2");
            s_mcastPort = 11000;

            // Start a multicast group.
            StartMulticast();

            // Display MulticastOption properties.
            MulticastOptionProperties();

            // Receive broadcast messages.
            ReceiveBroadcastMessages();
        }
    }
}

C#

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

// This sender example must be used in conjunction with the listener program.
// You must run this program as follows:
// Open a console window and run the listener from the command line.
// In another console window run the sender. In both cases you must specify
// the local IPAddress to use. To obtain this address,  run the ipconfig command
// from the command line.
//
namespace Mssc.TransportProtocols.Utilities
{
    class TestMulticastOption2
    {
        static IPAddress s_mcastAddress;
        static int s_mcastPort;
        static Socket s_mcastSocket;

        static void JoinMulticastGroup()
        {
            try
            {
                // Create a multicast socket.
                s_mcastSocket = new Socket(AddressFamily.InterNetwork,
                                         SocketType.Dgram,
                                         ProtocolType.Udp);

                // Get the local IP address used by the listener and the sender to
                // exchange multicast messages.
                Console.Write("\nEnter local IPAddress for sending multicast packets: ");
                IPAddress localIPAddr = IPAddress.Parse(Console.ReadLine());

                // Create an IPEndPoint object.
                IPEndPoint IPlocal = new IPEndPoint(localIPAddr, 0);

                // Bind this endpoint to the multicast socket.
                s_mcastSocket.Bind(IPlocal);

                // Define a MulticastOption object specifying the multicast group
                // address and the local IP address.
                // The multicast group address is the same as the address used by the listener.
                MulticastOption mcastOption;
                mcastOption = new MulticastOption(s_mcastAddress, localIPAddr);

                s_mcastSocket.SetSocketOption(SocketOptionLevel.IP,
                                            SocketOptionName.AddMembership,
                                            mcastOption);
            }
            catch (Exception e)
            {
                Console.WriteLine("\n" + e.ToString());
            }
        }

        static void BroadcastMessage(string message)
        {
            IPEndPoint endPoint;

            try
            {
                //Send multicast packets to the listener.
                endPoint = new IPEndPoint(s_mcastAddress, s_mcastPort);
                s_mcastSocket.SendTo(ASCIIEncoding.ASCII.GetBytes(message), endPoint);
                Console.WriteLine("Multicast data sent.....");
            }
            catch (Exception e)
            {
                Console.WriteLine("\n" + e.ToString());
            }

            s_mcastSocket.Close();
        }

        static void Main(string[] args)
        {
            // Initialize the multicast address group and multicast port.
            // Both address and port are selected from the allowed sets as
            // defined in the related RFC documents. These are the same
            // as the values used by the sender.
            s_mcastAddress = IPAddress.Parse("224.168.100.2");
            s_mcastPort = 11000;

            // Join the listener multicast group.
            JoinMulticastGroup();

            // Broadcast the message to the listener.
            BroadcastMessage("Hello multicast listener.");
        }
    }
}

Comentarios

Use para MulticastOption almacenar el IPAddress de un grupo de multidifusión que desea unir o quitar. Use el Socket.SetSocketOption método con los parámetros siguientes para unir un grupo de multidifusión.

Parámetro	Valor
socketOptionLevel	SocketOptionLevel.Udp
socketOptionName	AddMembership
object	MulticastOption

Use DropMembership para quitar un grupo de multidifusión.

Constructores

MulticastOption(IPAddress)	Inicializa una nueva versión de la clase MulticastOption para el grupo de multidifusión de IP especificado.
MulticastOption(IPAddress, Int32)	Inicializa una nueva instancia de la clase MulticastOption con la dirección del grupo de multidifusión IP y el índice de interfaz especificados.
MulticastOption(IPAddress, IPAddress)	Inicializa una nueva instancia de la clase MulticastOption con las direcciones de grupo de multidifusión de IP y de IP local especificadas asociadas a una interfaz de red.

Propiedades

Group	Obtiene o establece la dirección IP de un grupo de multidifusión.
InterfaceIndex	Obtiene o establece el índice de la interfaz que se utiliza para enviar y recibir paquetes de multidifusión.
LocalAddress	Obtiene o establece la dirección local asociada a un grupo de multidifusión.

Métodos

Equals(Object)	Determina si el objeto especificado es igual que el objeto actual. (Heredado de Object)
GetHashCode()	Sirve como la función hash predeterminada. (Heredado de Object)
GetType()	Obtiene el Type de la instancia actual. (Heredado de Object)
MemberwiseClone()	Crea una copia superficial del Object actual. (Heredado de Object)
ToString()	Devuelve una cadena que representa el objeto actual. (Heredado de Object)

Se aplica a