WCF学习笔记二：服务端Log

问题提出：

通过这几天对WCF的学习，准备使用WCF实现 服务端Log

参考资料：

服务站: 使用自定义行为扩展 WCF

总结WCF中截获消息的几种方式

总结WCF中截获消息的几种方式（二）

聚焦WCF行为的扩展

对总结WCF中截获消息的几种方式中的几种方法进行分析。

1  路由截获法：

　　根据总结WCF中截获消息的几种方式文中优缺点总结，不适合。

2  自定义Binding法：

　　因为与Binding关联，使Binding的替换实现起来比较复杂，所以不打算使用。

3  实现IMessageInspector接口法：

　　步骤1、编写MessageInspector类，实现IDispatchMessageInspector接口。

    public class MessageInspector : IDispatchMessageInspector
    {
        #region IDispatchMessageInspector Members

        public object AfterReceiveRequest(ref System.ServiceModel.Channels.Message request, System.ServiceModel.IClientChannel channel, System.ServiceModel.InstanceContext instanceContext)
        {
            Console.WriteLine(request.ToString());
            return null;
        }

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

        #endregion
    }

　　步骤2、将MessageInspector注入到EndpointDispatcher.DispatchRuntime.MessageInspectors中。

　　　　有两种实现方法：

　　　　　　a、编写MessageServiceBehavior类，实现IServiceBehavior接口。

    public class MessageServiceBehavior : IServiceBehavior
    {
        #region IServiceBehavior Members

        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 cDispatcher in serviceHostBase.ChannelDispatchers)
                foreach (EndpointDispatcher endpointDispatcher in cDispatcher.Endpoints)
                    endpointDispatcher.DispatchRuntime.MessageInspectors.Add(new MessageInspector());

        }

        public void Validate(ServiceDescription serviceDescription, System.ServiceModel.ServiceHostBase serviceHostBase)
        {

        }

        #endregion
    }

　　　　　　b、编写MessageEndpointBehavior类，实现IEndpointBehavior接口。

    public class MessageEndpointBehavior:IServiceBehavior, IEndpointBehavior
    {
        #region IServiceBehavior Members

        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 (ServiceEndpoint endpoint in serviceHostBase.Description.Endpoints)
            {
                endpoint.Behaviors.Add(this);
            }
        }

        public void Validate(ServiceDescription serviceDescription, System.ServiceModel.ServiceHostBase serviceHostBase)
        {
        }

        #endregion

        #region IEndpointBehavior Members

        public void AddBindingParameters(ServiceEndpoint endpoint, System.ServiceModel.Channels.BindingParameterCollection bindingParameters)
        {
        }

        public void ApplyClientBehavior(ServiceEndpoint endpoint, System.ServiceModel.Dispatcher.ClientRuntime clientRuntime)
        {
        }

        public void ApplyDispatchBehavior(ServiceEndpoint endpoint, System.ServiceModel.Dispatcher.EndpointDispatcher endpointDispatcher)
        {
            endpointDispatcher.DispatchRuntime.MessageInspectors.Add(new MessageInspector());
        }

        public void Validate(ServiceEndpoint endpoint)
        {
        }

        #endregion
    }

　　其实结果是一样的：都是将MessageInspector添加到服务端每个EndpointDispatcher（Host.ChannelDispatchers.Endpoints中）的MessageInspectors（EndpointDispatcher.DispatchRuntime.MessageInspectors）中。

4  跟踪诊断法：

　　自定义CustomTraceListener，继承自TraceListener抽象类。

    public class CustomTraceListener : TraceListener
    {
        public override void Write(string message)
        {
            Console.Write(message);
        }

        public override void WriteLine(string message)
        {
            Console.WriteLine(message);
        }
    }

　　配置参考：配置消息日志记录

 

代码下载：https://files.cnblogs.com/xujiaoxiang/Fly_Wcf_MessageLog.zip