Message.Headers 屬性

定義

命名空間:

System.ServiceModel.Channels

組件:

System.ServiceModel.Primitives.dll

套件:

System.ServiceModel.Primitives v8.0.0

來源:

Message.cs

在衍生類別中覆寫時，會取得訊息的標頭。

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

屬性值

MessageHeaders

MessageHeaders 物件，表示訊息的標頭。

例外狀況

ObjectDisposedException

訊息已經過處置。

範例

下列程式碼範例會示範使用通道處理站傳送訊息和讀取回覆的用戶端。

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

備註

Message 可以有零或多個標頭 (當做擴充機制使用)，以便在應用程式特定的訊息中傳遞資訊。 您可以藉由呼叫 Headers 方法，使用 Add 將訊息標頭新增至訊息中。

Windows Communication Foundation (WCF) 提供一些預先定義的訊息標頭，如下表所示。

標頭名稱	包含標頭名稱。
收件者	包含此訊息所針對的角色。
動作	提供應該如何處理此訊息的說明。
FaultTo	包含錯誤應該傳送之目標節點的位址。
寄件者	包含傳送訊息之節點的位址。
要求	指出此訊息是否為要求。
MessageID	包含此訊息的唯一 ID。
RelatesTo	包含與此訊息相關之訊息的 ID。
ReplyTo	包含應該針對要求傳送回覆之目標節點的位址。

給實施者的注意事項

在衍生類別中覆寫時，這個方法會為訊息的標頭傳回 MessageHeaders 物件。