从 WCF SOAP 响应中删除命名空间前缀

Question

我正在实施 WCF 服务来替换现有的 SOAP 服务。访问此服务的客户端无法更改（除了配置指向新服务器）。

当响应一个名为 Ping 的方法时，原始服务器会响应：

用 WCF 重新创建方法，我已经设法接近：

当我从 C# 控制台应用程序调用原始服务时，PingResult 已正确填充。只需将端点的地址更改为我的新服务并重新运行，服务返回新响应，但 PingResult 为空。我能看到的唯一区别是原始节点和我的节点是 PingResult 节点上的“ns1”前缀。我猜这会在客户端触发反序列化。

所以我的问题是，如何从 PingResult 中删除 ns1 前缀？

谢谢。

Answer 1

您可以试试这个，我以前从未更改过消息，所以我不确定它是否完全像这样工作，但我这样做是为了记录消息。

实现一个消息监听器。您有机会处理 BeforeSendReply 方法，您可以在其中访问消息并能够更改它。

然后用属性[MessageListenerBehavior]装饰你的合约实现类

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.ServiceModel.Channels;
using System.ServiceModel.Configuration;
using System.ServiceModel.Description;
using System.ServiceModel.Dispatcher;
using System.Text;
using System.Threading.Tasks;
using System.Xml;
using System.Xml.Linq;

namespace YourNamespace
{
    public class MessageListenerBehavior : Attribute, IDispatchMessageInspector, IServiceBehavior
    {
        public object AfterReceiveRequest(ref System.ServiceModel.Channels.Message request, System.ServiceModel.IClientChannel channel, System.ServiceModel.InstanceContext instanceContext)
        {
            return null;
        }

        public void BeforeSendReply(ref System.ServiceModel.Channels.Message reply, object correlationState)
        {

            Message msg = reply.CreateBufferedCopy(int.MaxValue).CreateMessage();

            try
            {
                //Setup StringWriter to use as input for our StreamWriter
                //This is needed in order to capture the body of the message, because the body is streamed.
                using (StringWriter stringWriter = new StringWriter())
                using (XmlWriter xmlTextWriter = XmlWriter.Create(stringWriter))
                {
                    msg.WriteMessage(xmlTextWriter);
                    xmlTextWriter.Flush();
                    xmlTextWriter.Close();

                    string thexml = stringWriter.ToString();

                    XDocument doc = XDocument.Parse(thexml);
                    // alter the doc here...........
                       Message newMsg = Message.CreateMessage(MessageVersion.Soap11, "http://..something", doc.ToString());

                reply = newMsg;
            }
            catch (Exception ex) { //handle it }
        }

        public void AddBindingParameters(ServiceDescription serviceDescription, System.ServiceModel.ServiceHostBase serviceHostBase, System.Collections.ObjectModel.Collection<ServiceEndpoint> endpoints, System.ServiceModel.Channels.BindingParameterCollection bindingParameters)
        {

        }

        public void ApplyDispatchBehavior(ServiceDescription serviceDescription, System.ServiceModel.ServiceHostBase serviceHostBase)
        {
            foreach (ChannelDispatcher dispatcher in serviceHostBase.ChannelDispatchers)
            {
                foreach (var endpoint in dispatcher.Endpoints)
                {
                    endpoint.DispatchRuntime.MessageInspectors.Add(new MessageListenerBehavior());
                }
            }
        }

        public void Validate(ServiceDescription serviceDescription, System.ServiceModel.ServiceHostBase serviceHostBase)
        {
            //throw new NotImplementedException();
        }
    }

    public class WcfMessgeLoggerExtension : BehaviorExtensionElement
    {
        public override Type BehaviorType
        {
            get
            {
                return typeof(MessageListenerBehavior);
            }
        }

        protected override object CreateBehavior()
        {
            return new MessageListenerBehavior();
        }
    }
}

当您执行Message.CreateMessage 时，我不知道Action 参数在回复中的重要性，但您可以阅读有关如何构建它的值：

Use the Actionproperty to control the action of the method's input message. Because WCF uses this action to dispatch an incoming message to the appropriate method, messages used within a contract operation must have unique actions. The default action value is a combination of the contract namespace (the default value is "http://tempuri.org/"), the contract name (interface name or the class name, if no explicit service interface is used), the operation name, and an additional string ("Response") if the message is a correlated response. You can override this default with the Action property.

更新

我在system.serviceModel 配置中也有这些项目：

  <serviceBehaviors>
    <behavior name="MessageListenerBehavior">
      <serviceDebug includeExceptionDetailInFaults="false" />
    </behavior>
  </serviceBehaviors>

  ...

<services>
  <service behaviorConfiguration="MessageListenerBehavior" name="... your service name...">

...