Message.Headers Properti

Definisi

Ruang nama:

System.ServiceModel.Channels

Rakitan:

System.ServiceModel.Primitives.dll

Paket:

System.ServiceModel.Primitives v8.0.0

Saat ditimpa di kelas turunan, mendapatkan header pesan.

public:
 abstract property System::ServiceModel::Channels::MessageHeaders ^ Headers { System::ServiceModel::Channels::MessageHeaders ^ get(); };

public abstract System.ServiceModel.Channels.MessageHeaders Headers { get; }

member this.Headers : System.ServiceModel.Channels.MessageHeaders

Public MustOverride ReadOnly Property Headers As MessageHeaders

Nilai Properti

MessageHeaders

Objek MessageHeaders yang mewakili header pesan.

Pengecualian

ObjectDisposedException

Pesan telah dibuang.

Contoh

Contoh kode berikut menunjukkan klien yang menggunakan pabrik saluran untuk mengirim pesan dan membaca balasan.

using System;
using System.Collections.Generic;
using System.Text;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.Runtime.Serialization;

namespace ConsoleApplication1
{
    class client
    {

        static void RunClient()
        {
            //Step1: create a binding with just HTTP
            CustomBinding binding = new CustomBinding();
            binding.Elements.Add(new HttpTransportBindingElement());
            //Step2: use the binding to build the channel factory
            IChannelFactory<IRequestChannel> factory =
            binding.BuildChannelFactory<IRequestChannel>(
                             new BindingParameterCollection());
            //open the channel factory
            factory.Open();
            //Step3: use the channel factory to create a channel
            IRequestChannel channel = factory.CreateChannel(
               new EndpointAddress("http://localhost:8080/channelapp"));
            channel.Open();
            //Step4: create a message
            Message requestmessage = Message.CreateMessage(
                MessageVersion.Soap12WSAddressing10,
                "http://contoso.com/someaction",
                 "This is the body data");
            //send message
            Message replymessage = channel.Request(requestmessage);
            Console.WriteLine("Reply message received");
            Console.WriteLine("Reply action: {0}",
                                  replymessage.Headers.Action);
            string data = replymessage.GetBody<string>();
            Console.WriteLine("Reply content: {0}", data);
            //Step5: don't forget to close the message
            requestmessage.Close();
            replymessage.Close();
            //don't forget to close the channel
            channel.Close();
            //don't forget to close the factory
            factory.Close();
        }
        public static void Main()
        {
            Console.WriteLine("Press [ENTER] when service is ready");
            Console.ReadLine();
            RunClient();
            Console.WriteLine("Press [ENTER] to exit");
            Console.ReadLine();
        }
    }
}

Imports System.Collections.Generic
Imports System.Text
Imports System.ServiceModel
Imports System.ServiceModel.Channels
Imports System.Runtime.Serialization

Namespace ConsoleApplication1
    Friend Class client


        Private Shared Sub RunClient()
            'Step1: create a binding with just HTTP
            Dim binding As New CustomBinding()
            binding.Elements.Add(New HttpTransportBindingElement())
            'Step2: use the binding to build the channel factory
            Dim factory As IChannelFactory(Of IRequestChannel) = binding.BuildChannelFactory(Of IRequestChannel)(New BindingParameterCollection())
            'open the channel factory
            factory.Open()
            'Step3: use the channel factory to create a channel
            Dim channel As IRequestChannel = factory.CreateChannel(New EndpointAddress("http://localhost:8080/channelapp"))
            channel.Open()
            'Step4: create a message
            Dim requestmessage As Message = Message.CreateMessage(MessageVersion.Soap12WSAddressing10, "http://contoso.com/someaction", "This is the body data")
            'send message
            Dim replymessage As Message = channel.Request(requestmessage)
            Console.WriteLine("Reply message received")
            Console.WriteLine("Reply action: {0}", replymessage.Headers.Action)
            Dim data = replymessage.GetBody(Of String)()
            Console.WriteLine("Reply content: {0}", data)
            'Step5: don't forget to close the message
            requestmessage.Close()
            replymessage.Close()
            'don't forget to close the channel
            channel.Close()
            'don't forget to close the factory
            factory.Close()
        End Sub
        Public Shared Sub Main()
            Console.WriteLine("Press [ENTER] when service is ready")
            Console.ReadLine()
            RunClient()
            Console.WriteLine("Press [ENTER] to exit")
            Console.ReadLine()
        End Sub
    End Class
End Namespace

Keterangan

Message dapat memiliki header nol atau lebih yang digunakan sebagai mekanisme ekstensi untuk meneruskan informasi dalam pesan yang spesifik untuk aplikasi. Anda dapat menggunakan Headers untuk menambahkan header pesan ke pesan dengan memanggil Add metode .

Windows Communication Foundation (WCF) menyediakan sejumlah header pesan yang telah ditentukan sebelumnya, seperti yang diperlihatkan dalam tabel berikut ini.

Nama header	Berisi nama header.
Untuk	Berisi peran yang ditargetkan pesan.
Tindakan	Memberikan deskripsi tentang bagaimana pesan harus diproses.
FaultTo	Berisi alamat simpul tempat kesalahan harus dikirim.
Dari	Berisi alamat simpul yang mengirim pesan.
Minta	Menunjukkan apakah pesan tersebut adalah permintaan.
MessageID	Berisi ID unik pesan.
RelatesTo	Berisi ID pesan yang terkait dengan pesan ini.
ReplyTo	Berisi alamat simpul tempat balasan harus dikirim untuk permintaan.

Catatan Bagi Implementer

Ketika ditimpa dalam kelas turunan, metode ini mengembalikan MessageHeaders objek untuk header pesan.