通过

如何：检查和修改服务上的消息

  • 项目

通过实现 System.ServiceModel.Dispatcher.IDispatchMessageInspector 并将其插入服务运行时，可以检查或修改 Windows Communication Foundation (WCF) 客户端上的传入或传出消息。有关更多信息，请参见扩展调度程序。服务上的等效功能为 System.ServiceModel.Dispatcher.IClientMessageInspector。

检查或修改消息

  1. 实现 System.ServiceModel.Dispatcher.IDispatchMessageInspector 接口。

  2. 根据您希望轻松插入服务消息检查器的范围，实现 System.ServiceModel.Description.IServiceBehavior、System.ServiceModel.Description.IEndpointBehavior 或 System.ServiceModel.Description.IContractBehavior 接口。

  3. 在 System.ServiceModel.ServiceHost 上调用 System.ServiceModel.ICommunicationObject.Open 方法之前，先插入行为。有关详细信息，请参见使用行为配置和扩展运行时。

示例

下面的代码示例按顺序演示以下各项：

  • 服务检查器实现。

  • 插入检查器的服务行为。

  • 在服务应用程序中加载和运行该行为的配置文件。

#Region "IDispatchMessageInspector Members"
    Public Function AfterReceiveRequest(ByRef request As System.ServiceModel.Channels.Message, _
                       ByVal channel As IClientChannel, ByVal instanceContext As InstanceContext) _
                       As Object Implements IDispatchMessageInspector.AfterReceiveRequest
        Console.WriteLine("IDispatchMessageInspector.AfterReceiveRequest called.")
        Return Nothing
    End Function

    Public Sub BeforeSendReply(ByRef reply As System.ServiceModel.Channels.Message, ByVal correlationState As Object) _
    Implements IDispatchMessageInspector.BeforeSendReply
        Console.WriteLine("IDispatchMessageInspector.BeforeSendReply called.")
    End Sub
#End Region
#Region "IServiceBehavior Members"
    Public Sub AddBindingParameters(ByVal serviceDescription As ServiceDescription, _
                   ByVal serviceHostBase As ServiceHostBase, ByVal endpoints As  _
                   System.Collections.ObjectModel.Collection(Of ServiceEndpoint), _
                   ByVal bindingParameters As BindingParameterCollection) Implements IServiceBehavior.AddBindingParameters
        Return
    End Sub

    Public Sub ApplyDispatchBehavior(ByVal serviceDescription As ServiceDescription, _
                                     ByVal serviceHostBase As ServiceHostBase) Implements _
                                     IServiceBehavior.ApplyDispatchBehavior
        For Each chDisp As ChannelDispatcher In serviceHostBase.ChannelDispatchers
            For Each epDisp As EndpointDispatcher In chDisp.Endpoints
                epDisp.DispatchRuntime.MessageInspectors.Add(New Inspector())
                For Each op As DispatchOperation In epDisp.DispatchRuntime.Operations
                    op.ParameterInspectors.Add(New Inspector())
                Next op
            Next epDisp
        Next chDisp
    End Sub

<configuration>
  <system.serviceModel>
    <services>
      <service 
        name="Microsoft.WCF.Documentation.SampleService"
        behaviorConfiguration="inspectorBehavior">
        <host>
          <baseAddresses>
            <add baseAddress="https://localhost:8080/SampleService" />
          </baseAddresses>
        </host>
        <endpoint
          address=""
          binding="wsHttpBinding"
          contract="Microsoft.WCF.Documentation.ISampleService"
        />
 
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior name="inspectorBehavior">
          <serviceInspectors />
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <extensions>
      <behaviorExtensions>
        <add 
          name="serviceInspectors" 
          type="Microsoft.WCF.Documentation.InspectorInserter, HostApplication, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null"
        />
      </behaviorExtensions>
    </extensions>
  </system.serviceModel>
</configuration>

另请参见

参考

System.ServiceModel.Dispatcher.IClientMessageInspector
System.ServiceModel.Dispatcher.IDispatchMessageInspector

概念

使用行为配置和扩展运行时