Message.Headers Message.Headers Message.Headers Message.Headers Property

Definition

When overridden in a derived class, gets the headers of the message.

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
Property Value

A MessageHeaders object that represents the headers of the message.

Exceptions

Examples

The following code example shows a client that uses the channel factory to send a message and read the reply.

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
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

Remarks

A Message can have zero or more headers that are used as an extension mechanism to pass information in messages that is application-specific. You can use Headers to add message headers to a message by calling the Add method.

Windows Communication Foundation (WCF) provides a number of predefined message headers, as shown in the following table.

Header Name Contains the header name.
To Contains the role that the message is targeting.
Action Provides a description of how the message should be processed.
FaultTo Contains the address of the node to which faults should be sent.
From Contains the address of the node that sent the message.
Request Indicates whether the message is a request.
MessageID Contains the unique ID of the message.
RelatesTo Contains the IDs of messages that are related to this message.
ReplyTo Contains the address of the node to which a reply should be sent for a request.

Notes to Inheritors

When overridden in a derived class, this method returns a MessageHeaders object for the headers of the message.

Applies to