WCF消息交叉點配置問題

Question

這個問題似乎已被多次詢問，但我無法讓它發揮作用。

首先，我現在已經在Windows 7和Windows 8上使用VS 2012在兩者上嘗試了這個並且具有完全相同的問題。

我正在嘗試編寫一個接收和處理SOAP標頭消息的WCF服務，經過大量搜索后發現我應該使用Message Interceptor來讀取和處理SOAP標頭。

所以我在我的本地機器上創建了一個新網站，並稱之為DemoMessageInspector。 在此解決方案中，我添加了以下類：

HmacVerificationBehavior

Imports System.ServiceModel.Description

Public Class HmacVerificationBehavior
    Implements IEndpointBehavior
  #Region "IEndpointBehavior Members"

Public Sub AddBindingParameters(endpoint As ServiceEndpoint, bindingParameters As System.ServiceModel.Channels.BindingParameterCollection) Implements IEndpointBehavior.AddBindingParameters

End Sub

Public Sub ApplyClientBehavior(endpoint As ServiceEndpoint, clientRuntime As System.ServiceModel.Dispatcher.ClientRuntime) Implements IEndpointBehavior.ApplyClientBehavior

End Sub

Public Sub ApplyDispatchBehavior(endpoint As ServiceEndpoint, endpointDispatcher As System.ServiceModel.Dispatcher.EndpointDispatcher) Implements IEndpointBehavior.ApplyDispatchBehavior
    Dim inspector As New HmacVerificationInspector()

    endpointDispatcher.DispatchRuntime.MessageInspectors.Add(inspector)
End Sub

Public Sub Validate(endpoint As ServiceEndpoint) Implements IEndpointBehavior.Validate

End Sub

#End Region

End Class

HmacVerificationConfigurationSection

Imports System.ServiceModel.Configuration
Imports System.ServiceModel.Description

Namespace NamespaceHere

Public Class HmacVerificationConfigurationSection
    Inherits BehaviorExtensionElement
    Implements IServiceBehavior

#Region "IServiceBehavior Members"

    Public Sub AddBindingParameters(serviceDescription As ServiceDescription, serviceHostBase As System.ServiceModel.ServiceHostBase, endpoints As System.Collections.ObjectModel.Collection(Of ServiceEndpoint), bindingParameters As System.ServiceModel.Channels.BindingParameterCollection) Implements IServiceBehavior.AddBindingParameters

    End Sub

    Public Sub ApplyDispatchBehavior(serviceDescription As ServiceDescription, serviceHostBase As System.ServiceModel.ServiceHostBase) Implements IServiceBehavior.ApplyDispatchBehavior

    End Sub

    Public Sub Validate(serviceDescription As ServiceDescription, serviceHostBase As System.ServiceModel.ServiceHostBase) Implements IServiceBehavior.Validate

    End Sub

#End Region

    Public Overrides ReadOnly Property BehaviorType() As Type
        Get
            Return GetType(HmacVerificationBehavior)
        End Get
    End Property

    Protected Overrides Function CreateBehavior() As Object
        Return New HmacVerificationBehavior()
    End Function

End Class

End Namespace

HmacVerificationInspector

Imports System.ServiceModel.Dispatcher
Imports System.ServiceModel.Channels

Public Class HmacVerificationInspector
Implements IDispatchMessageInspector


#Region "IDispatchMessageInspector Members"

Public Function AfterReceiveRequest(ByRef request As System.ServiceModel.Channels.Message, channel As System.ServiceModel.IClientChannel, instanceContext As System.ServiceModel.InstanceContext) As Object
    Dim buffer As MessageBuffer = request.CreateBufferedCopy(Int32.MaxValue)
    request = buffer.CreateMessage()
    Dim dupeRequest As Message = buffer.CreateMessage()

    ValidateHmac(dupeRequest)

    buffer.Close()

    Return Nothing
End Function

Public Sub BeforeSendReply(ByRef reply As System.ServiceModel.Channels.Message, correlationState As Object)


End Sub

#End Region

Public Function AfterReceiveRequest1(ByRef request As Message, channel As ServiceModel.IClientChannel, instanceContext As ServiceModel.InstanceContext) As Object Implements IDispatchMessageInspector.AfterReceiveRequest

End Function

Public Sub BeforeSendReply1(ByRef reply As Message, correlationState As Object) Implements IDispatchMessageInspector.BeforeSendReply

End Sub
End Class

IService

Imports System.ServiceModel

' NOTE: You can use the "Rename" command on the context menu to change the interface name "IService" in both code and config file together.'
<ServiceContract()>
Public Interface IService

<OperationContract()>
Sub DoWork()

<OperationContract()>
Function DoSomething(ByVal _str As String) As String


End Interface

和服務

Public Class Service
Implements IService

Public Sub DoWork() Implements IService.DoWork
End Sub

Public Function DoSomething(ByVal _str As String) As String Implements IService.DoSomething

    Return "Message [" & _str & "]"

End Function

End 

Web.Config文件如下：

<configuration>
<system.web>
<compilation debug="true" strict="false" explicit="true" targetFramework="4.5"/>
<httpRuntime targetFramework="4.5"/>
  </system.web>
  <system.serviceModel>
   <extensions>
  <behaviorExtensions>
    <add name="hmacVerification" 
         type="NamespaceHere.HmacVerificationConfigurationSection, NamespaceHere, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"/>
     </behaviorExtensions>
   </extensions>
  <services>
    <service name="MySecureService">
    <endpoint address="" binding="webHttpBinding" contract="IMySecureService" behaviorConfiguration="web"/>
  </service>
</services>
<behaviors>
  <endpointBehaviors>
    <behavior name="web">
      <webHttp automaticFormatSelectionEnabled="true"/>
      <hmacVerification />      *********COMMENT OUT**************
    </behavior>
  </endpointBehaviors>
  <serviceBehaviors>
    <behavior name="">
      <serviceMetadata httpGetEnabled="true"/>
      <serviceDebug includeExceptionDetailInFaults="false"/>
    </behavior>
  </serviceBehaviors>
</behaviors>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true" aspNetCompatibilityEnabled="true"/>
  </system.serviceModel>
</configuration>

因此，如果在Web.Config中注釋掉該行，我們將擁有完美的示例代碼。 一旦取消注釋，就會發生以下情況：

Server Error in '/DemoMessageInspector' Application.
--------------------------------------------------------------------------------


Configuration Error 
  Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately. 

 Parser Error Message: The type 'NamespaceHere.HmacVerificationConfigurationSection, NamespaceHere, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' registered for extension 'hmacVerification' could not be loaded.

Source Error: 



Line 25:         <behavior name="web">
Line 26:           <webHttp automaticFormatSelectionEnabled="true"/>
Line 27:           <hmacVerification />
Line 28:         </behavior>
Line 29:       </endpointBehaviors>


 Source File:  C:\inetpub\wwwroot\DemoMessageInspector\web.config    Line:  27 


--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.18044 

那么，問題基本上應該如何配置呢？

或許問題是，這是否是用於完成從WCF端點讀取SOAP標頭的簡單任務的正確方法？

Answer 1

如果你需要做的就是“完成從WCF端點讀取SOAP頭的簡單任務”，那么你應該能夠使用：

OperationContext.Current.IncomingMessageHeaders

以下鏈接包含IncomingMessageHeaders集合的實現詳細信息：

http://msdn.microsoft.com/en-us/library/system.servicemodel.operationcontext.incomingmessageheaders.aspx