WCF服务端消息监测
WCF的调试工具很多,日志记录功能也很强大,但我们记录取得自定义的日志时(如用LOG4),WCF提供的日志记录器并不太适用,所以我们就需要自已处理WCF的消息处理,来记录我们的日志.
1 . 几个需要解释的对象
Message:WCF消息的承载对象,它的内容是符合SOAP标准的XML文本
IServiceBehavior:WCF服务动作的插件,以便附加更多的动作处理
IDispatchMessageInspector:入站和出站应用程序消息进行自定义检查或修改。
2.构建IDispatchMessageInspector对象,它用于侦测消息
/// <summary> /// 侦测入站与出站的消息 /// </summary> public class MessageHandler : IDispatchMessageInspector { #region IDispatchMessageInspector /// <summary> /// 操作开始前的处理 /// <param name="request">客户端请求消息</param> /// <param name="channel">通道</param> /// <param name="instanceContext">实例上下文</param> /// <returns>自定义对象,这是保持为空</returns> public object AfterReceiveRequest(ref System.ServiceModel.Channels.Message request, IClientChannel channel, InstanceContext instanceContext) { Debug.WriteLine("入站消息:{0}",request);//显示消息的全部内容 return null; } /// <summary> /// 操作结束后的操作(记录返回结果) /// </summary> /// <param name="reply">准备返回客户端的消息</param> /// <param name="correlationState">相关状态</param> public void BeforeSendReply(ref System.ServiceModel.Channels.Message reply, object correlationState) { Debug.WriteLine("出站消息:{0}", reply);//显示消息的全部内容 } #endregion }
3 构建IServiceBehavior对象,它用于附加自定义Behavior,以便加入消息处理器
/// <summary> /// 自定义服务行为,以进行消息和异常的侦测与处理 /// </summary> public class MyBehavior: IServiceBehavior { #region IServiceBehavior void IServiceBehavior.AddBindingParameters(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase, System.Collections.ObjectModel.Collection<ServiceEndpoint> endpoints, System.ServiceModel.Channels.BindingParameterCollection bindingParameters) { } /// <summary> /// 处理以附加处理器 /// </summary> /// <param name="serviceDescription"></param> /// <param name="serviceHostBase"></param> void IServiceBehavior.ApplyDispatchBehavior(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase) { ServiceType = serviceDescription.ServiceType; foreach (ChannelDispatcher di in serviceHostBase.ChannelDispatchers) { di.ErrorHandlers.Add(new ExceptionHandler()); di.IncludeExceptionDetailInFaults = true; foreach (EndpointDispatcher epDisp in di.Endpoints) { epDisp.DispatchRuntime.MessageInspectors.Add(new MessageHandler());//加入消息记录处理器 } } } void IServiceBehavior.Validate(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase) { } #endregion }
注意:IServiceBehavior.ApplyDispatchBehavior方法实现时的这一句
epDisp.DispatchRuntime.MessageInspectors.Add(new MessageHandler());//加入消息记录处理器
它实现了消息处理器的加入
4 向服务加入自定义Behavior(编程方式)
ServiceHost host = new ServiceHost(typeof(MyService));//这个服务大家自己实现,不贴代码了 host.Description.Behaviors.Add(new MyBehavior());//加入自定义Behavior host.Open();
说明:host.Description.Behaviors.Add 加入自定义Behavior,但要注意,一种类型只能加入一次,必须在Open之前加入.
特别说明: