IServiceBehavior.ApplyDispatchBehavior(ServiceDescription, ServiceHostBase) 方法

定义

用于更改运行时属性值或插入自定义扩展对象(例如错误处理程序、消息或参数拦截器、安全扩展以及其他自定义扩展对象)。Provides the ability to change run-time property values or insert custom extension objects such as error handlers, message or parameter interceptors, security extensions, and other custom extension objects.

public:
 void ApplyDispatchBehavior(System::ServiceModel::Description::ServiceDescription ^ serviceDescription, System::ServiceModel::ServiceHostBase ^ serviceHostBase);
public void ApplyDispatchBehavior (System.ServiceModel.Description.ServiceDescription serviceDescription, System.ServiceModel.ServiceHostBase serviceHostBase);
abstract member ApplyDispatchBehavior : System.ServiceModel.Description.ServiceDescription * System.ServiceModel.ServiceHostBase -> unit
Public Sub ApplyDispatchBehavior (serviceDescription As ServiceDescription, serviceHostBase As ServiceHostBase)

参数

serviceDescription
ServiceDescription

服务说明。The service description.

serviceHostBase
ServiceHostBase

当前正在生成的宿主。The host that is currently being built.

示例

下面的代码示例演示了如何使用配置文件中所指定的服务行为来向服务应用程序中插入自定义错误处理程序。The following code example shows the use of a service behavior specified in a configuration file to insert a custom error handler in a service application. 在该示例中,错误处理程序捕获所有异常,并将它们转换为一个自定义 GreetingFault SOAP 错误,该自定义错误会随后返回给客户端。In this example, the error handler catches all exceptions and converts them into a custom GreetingFault SOAP fault that is then returned to the client.

下面的 IServiceBehavior 实现不添加任何绑定参数对象,而会将自定义 System.ServiceModel.Dispatcher.IErrorHandler 对象添加到所有 ChannelDispatcher.ErrorHandlers 属性,并会验证服务行为所应用到的、System.ServiceModel.FaultContractAttribute 类型为 GreetingFault 的服务的每个操作。The following IServiceBehavior implementation adds no binding parameter objects, adds the custom System.ServiceModel.Dispatcher.IErrorHandler object to each ChannelDispatcher.ErrorHandlers property, and validates that each operation of the service to which the service behavior is applied and has a System.ServiceModel.FaultContractAttribute of type GreetingFault.

// This behavior modifies no binding parameters.
#region IServiceBehavior Members
public void AddBindingParameters(
  ServiceDescription description,
  ServiceHostBase serviceHostBase,
  System.Collections.ObjectModel.Collection<ServiceEndpoint> endpoints,
  System.ServiceModel.Channels.BindingParameterCollection parameters
)
{
  return;
}

// This behavior is an IErrorHandler implementation and
// must be applied to each ChannelDispatcher.
public void ApplyDispatchBehavior(ServiceDescription description, ServiceHostBase serviceHostBase)
{
  Console.WriteLine("The EnforceGreetingFaultBehavior has been applied.");
  foreach(ChannelDispatcher chanDisp in serviceHostBase.ChannelDispatchers)
  {
    chanDisp.ErrorHandlers.Add(this);
  }
}

// This behavior requires that the contract have a SOAP fault with a detail type of GreetingFault.
public void Validate(ServiceDescription description, ServiceHostBase serviceHostBase)
{
  Console.WriteLine("Validate is called.");
  foreach (ServiceEndpoint se in description.Endpoints)
  {
    // Must not examine any metadata endpoint.
    if (se.Contract.Name.Equals("IMetadataExchange")
      && se.Contract.Namespace.Equals("http://schemas.microsoft.com/2006/04/mex"))
      continue;
    foreach (OperationDescription opDesc in se.Contract.Operations)
    {
      if (opDesc.Faults.Count == 0)
        throw new InvalidOperationException(String.Format(
          "EnforceGreetingFaultBehavior requires a "
          + "FaultContractAttribute(typeof(GreetingFault)) in each operation contract.  "
          + "The \"{0}\" operation contains no FaultContractAttribute.",
          opDesc.Name)
        );
      bool gfExists = false;
      foreach (FaultDescription fault in opDesc.Faults)
      {
        if (fault.DetailType.Equals(typeof(GreetingFault)))
        {
          gfExists = true;
          continue;
        }
      }
      if (gfExists == false)
      {
        throw new InvalidOperationException(
"EnforceGreetingFaultBehavior requires a FaultContractAttribute(typeof(GreetingFault)) in an operation contract."
        );
      }
    }
  }
}
#endregion
' This behavior modifies no binding parameters.
#Region "IServiceBehavior Members"
Public Sub AddBindingParameters(ByVal description As ServiceDescription, ByVal serviceHostBase As ServiceHostBase, ByVal endpoints As System.Collections.ObjectModel.Collection(Of ServiceEndpoint), ByVal parameters As System.ServiceModel.Channels.BindingParameterCollection) Implements IServiceBehavior.AddBindingParameters
  Return
End Sub

' This behavior is an IErrorHandler implementation and 
' must be applied to each ChannelDispatcher.
Public Sub ApplyDispatchBehavior(ByVal description As ServiceDescription, ByVal serviceHostBase As ServiceHostBase) Implements IServiceBehavior.ApplyDispatchBehavior
  Console.WriteLine("The EnforceGreetingFaultBehavior has been applied.")
  For Each chanDisp As ChannelDispatcher In serviceHostBase.ChannelDispatchers
    chanDisp.ErrorHandlers.Add(Me)
  Next chanDisp
End Sub

' This behavior requires that the contract have a SOAP fault with a detail type of GreetingFault.
Public Sub Validate(ByVal description As ServiceDescription, ByVal serviceHostBase As ServiceHostBase) Implements IServiceBehavior.Validate
  Console.WriteLine("Validate is called.")
  For Each se As ServiceEndpoint In description.Endpoints
    ' Must not examine any metadata endpoint.
    If se.Contract.Name.Equals("IMetadataExchange") AndAlso se.Contract.Namespace.Equals("http://schemas.microsoft.com/2006/04/mex") Then
      Continue For
    End If
    For Each opDesc As OperationDescription In se.Contract.Operations
      If opDesc.Faults.Count = 0 Then
        Throw New InvalidOperationException(String.Format("EnforceGreetingFaultBehavior requires a " & "FaultContractAttribute(typeof(GreetingFault)) in each operation contract.  " & "The ""{0}"" operation contains no FaultContractAttribute.", opDesc.Name))
      End If
      Dim gfExists As Boolean = False
      For Each fault As FaultDescription In opDesc.Faults
        If fault.DetailType.Equals(GetType(GreetingFault)) Then
          gfExists = True
          Continue For
        End If
      Next fault
      If gfExists = False Then
        Throw New InvalidOperationException("EnforceGreetingFaultBehavior requires a FaultContractAttribute(typeof(GreetingFault)) in an operation contract.")
      End If
    Next opDesc
  Next se
End Sub
#End Region

在该示例中,行为类还可实现 System.ServiceModel.Configuration.BehaviorExtensionElement,这样就可通过在应用程序配置文件中使用服务行为来插入服务行为,具体请参见下面的代码示例。In this example, the behavior class also implements System.ServiceModel.Configuration.BehaviorExtensionElement, which enables the service behavior to be inserted by using it in an application configuration file, as the following code example demonstrates.

<configuration>
  <system.serviceModel>
    <services>
      <service 
        name="Microsoft.WCF.Documentation.SampleService"
        behaviorConfiguration="metaAndErrors">
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost:8080/SampleService"/>
          </baseAddresses>
        </host>
        <endpoint
          address=""
          binding="wsHttpBinding"
          contract="Microsoft.WCF.Documentation.ISampleService"
         />
        <endpoint
          address="mex"
          binding="mexHttpBinding"
          contract="IMetadataExchange"
         />
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior name="metaAndErrors">
          <serviceDebug includeExceptionDetailInFaults="true"/>
          <serviceMetadata httpGetEnabled="true"/>
          <enforceGreetingFaults />
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <extensions>
      <behaviorExtensions>
        <add 
          name="enforceGreetingFaults" 
          type="Microsoft.WCF.Documentation.EnforceGreetingFaultBehavior, HostApplication, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null"
        />
      </behaviorExtensions>
    </extensions>
  </system.serviceModel>
</configuration>

注解

实现 ApplyDispatchBehavior 方法可以检查或修改正在构建的 ServiceHostBase 对象,从而支持某些自定义执行方案。Implement the ApplyDispatchBehavior method to inspect or modify the ServiceHostBase object that is being constructed in order to support some custom execution scenario.

备注

所有 IServiceBehavior 方法会将 System.ServiceModel.Description.ServiceDescriptionSystem.ServiceModel.ServiceHostBase 对象作为参数传递。All of the IServiceBehavior methods pass System.ServiceModel.Description.ServiceDescription and System.ServiceModel.ServiceHostBase objects as a parameters. ServiceDescription 参数仅用于自定义检查和插入;如果您修改了这些对象,则执行行为将不确定。The ServiceDescription parameter is for examination and insertion of customizations only; if you otherwise modify these objects the execution behavior is undefined.

适用于