Message.Close 方法

定義

命名空間:

System.ServiceModel.Channels

組件:

System.ServiceModel.Primitives.dll

組件:

System.ServiceModel.dll

關閉 Message 並釋放所有資源。

public:
 void Close();

public void Close ();

member this.Close : unit -> unit

Public Sub Close ()

範例

下列程式碼範例會示範如何建立訊息、將訊息傳送至服務以及接收回應訊息。 這時會顯示回應訊息內容，然後關閉訊息。

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 確實有完成項，它會造成當訊息進行記憶體回收時呼叫 Close。 這並非最佳做法，因為 .NET Framework 的記憶體回收 (GC) 機制不一定會在您用完非記憶體之系統資源的時候執行。 因此，當完成訊息的內容時，您一定要呼叫這個方法。 Close 方法是 Dispose (Message 也會實作此處置) 的同義資料表 (Synonym)。 在處置此訊息時，此訊息也會處置用於建構本文的物件。

在關閉之後，如果您呼叫任何方法或存取訊息的任何屬性，便會擲回 ObjectDisposedException。 在關閉訊息之後，呼叫與訊息有關之其他物件的任何方法或存取其任何屬性 (例如針對本文或標頭所傳回的訊息標頭集合、訊息屬性值或 XmlReader 執行個體)，都會出現未定義的行為。