如何：检查或修改参数
通过实现 System.ServiceModel.Dispatcher.IParameterInspector 接口并将它插入客户端或服务运行库，您可以检查或修改对 Windows Communication Foundation (WCF) 客户端对象或 WCF 服务执行的单个操作的传入或传出消息。通常，操作行为用于为单个操作添加参数检查器；其他行为可以用于在更大范围内提供对运行库的方便访问。有关更多信息，请参见扩展客户端和扩展调度程序。
检查或修改参数
实现 System.ServiceModel.Dispatcher.IParameterInspector 接口。
实现 System.ServiceModel.Description.IOperationBehavior、System.ServiceModel.Description.IEndpointBehavior、System.ServiceModel.Description.IServiceBehavior 或 System.ServiceModel.Description.IContractBehavior（取决于要求的范围），以便将参数检查器添加到 System.ServiceModel.Dispatcher.ClientOperation.ParameterInspectors 或 System.ServiceModel.Dispatcher.DispatchOperation.ParameterInspectors 属性。
在对 System.ServiceModel.ChannelFactory 调用 System.ServiceModel.ClientBase.Open 或 System.ServiceModel.ICommunicationObject.Open 方法前，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：
参数检查器实现。
行为实现，它使用 System.ServiceModel.Description.IOperationBehavior、System.ServiceModel.Description.IEndpointBehavior 和 System.ServiceModel.Description.IServiceBehavior 插入参数检查器。
配置文件，它在客户端应用程序中加载和运行终结点行为，以便在客户端上插入参数检查器。
#Region "IParameterInspector Members"
Public Sub AfterCall(ByVal operationName As String, ByVal outputs() As Object, ByVal returnValue As Object, _
ByVal correlationState As Object) Implements IParameterInspector.AfterCall
Console.WriteLine("IParameterInspector.AfterCall called for {0} with return value {1}.", _
operationName, returnValue.ToString())
End Sub
Public Function BeforeCall(ByVal operationName As String, ByVal inputs() As Object) As Object Implements _
IParameterInspector.BeforeCall
Console.WriteLine("IParameterInspector.BeforeCall called for {0}.", operationName)
Return Nothing
End Function
Imports System.ServiceModel
Imports System.ServiceModel.Channels
Imports System.ServiceModel.Configuration
Imports System.ServiceModel.Description
Imports System.ServiceModel.Dispatcher
Imports System.Text
Namespace Microsoft.WCF.Documentation
Public Class InspectorInserter
Inherits BehaviorExtensionElement
Implements IServiceBehavior, IEndpointBehavior, IOperationBehavior
#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
Public Sub Validate(ByVal serviceDescription As ServiceDescription, ByVal serviceHostBase As ServiceHostBase) _
Implements IServiceBehavior.Validate
Return
End Sub
#End Region
#Region "IEndpointBehavior Members"
Public Sub AddBindingParameters(ByVal endpoint As ServiceEndpoint, ByVal bindingParameters _
As BindingParameterCollection) Implements IEndpointBehavior.AddBindingParameters
Return
End Sub
Public Sub ApplyClientBehavior(ByVal endpoint As ServiceEndpoint, ByVal clientRuntime As ClientRuntime) _
Implements IEndpointBehavior.ApplyClientBehavior
clientRuntime.MessageInspectors.Add(New Inspector())
For Each op As ClientOperation In clientRuntime.Operations
op.ParameterInspectors.Add(New Inspector())
Next op
End Sub
Public Sub ApplyDispatchBehavior(ByVal endpoint As ServiceEndpoint, ByVal endpointDispatcher As _
EndpointDispatcher) Implements IEndpointBehavior.ApplyDispatchBehavior
endpointDispatcher.DispatchRuntime.MessageInspectors.Add(New Inspector())
For Each op As DispatchOperation In endpointDispatcher.DispatchRuntime.Operations
op.ParameterInspectors.Add(New Inspector())
Next op
End Sub
Public Sub Validate(ByVal endpoint As ServiceEndpoint) Implements IEndpointBehavior.Validate
Return
End Sub
#End Region
#Region "IOperationBehavior Members"
Public Sub AddBindingParameters(ByVal operationDescription As OperationDescription, _
ByVal bindingParameters As BindingParameterCollection) Implements _
IOperationBehavior.AddBindingParameters
Return
End Sub
Public Sub ApplyClientBehavior(ByVal operationDescription As OperationDescription, ByVal _
clientOperation As ClientOperation) Implements IOperationBehavior.ApplyClientBehavior
clientOperation.ParameterInspectors.Add(New Inspector())
End Sub
Public Sub ApplyDispatchBehavior(ByVal operationDescription As OperationDescription, ByVal dispatchOperation As _
DispatchOperation) Implements IOperationBehavior.ApplyDispatchBehavior
dispatchOperation.ParameterInspectors.Add(New Inspector())
End Sub
Public Sub Validate(ByVal operationDescription As OperationDescription) Implements IOperationBehavior.Validate
Return
End Sub
#End Region
Public Overrides ReadOnly Property BehaviorType() As Type
Get
Return GetType(InspectorInserter)
End Get
End Property
Protected Overrides Function CreateBehavior() As Object
Return New InspectorInserter()
End Function
End Class
End Namespace
<client>
<endpoint
address="https://localhost:8080/SampleService"
behaviorConfiguration="clientInspectorsAdded"
binding="wsHttpBinding"
bindingConfiguration="WSHttpBinding_ISampleService"
contract="ISampleService"
name="WSHttpBinding_ISampleService"
>
</endpoint>
</client>
<behaviors>
<endpointBehaviors>
<behavior name="clientInspectorsAdded">
<clientInterceptors />
</behavior>
</endpointBehaviors>
</behaviors>
<extensions>
<behaviorExtensions>
<add
name="clientInterceptors"
type="Microsoft.WCF.Documentation.InspectorInserter, HostApplication, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null"
/>
</behaviorExtensions>
</extensions>