每个服务端点的多个消息检查器答案

【问题标题】：Multiple Message Inspectors for each service endpoint每个服务端点的多个消息检查器
【发布时间】：2017-01-05 23:18:46
【问题描述】：

如果 WCF 服务公开三个端点，那么我们可以为每个端点设置不同的消息检查器吗？如果是，那么我们如何在每个端点上应用？

【问题讨论】：

标签： wcf

【解决方案1】：

首先，您应该创建一个端点行为来应用您想要的格式化程序。

class CustomInspectorEndpointBehavior : IEndpointBehavior
{
    public void ApplyDispatchBehavior(ServiceEndpoint endpoint,
        EndpointDispatcher endpointDispatcher)
    {
        endpointDispatcher.DispatchRuntime.MessageInspectors.Add(new CustomFormatter());
    }

    ...
}

或者，如果有一个通用逻辑，您可以使用服务行为类为每个端点应用一个行为：

class MultipleInspectorsServiceBehavior : IServiceBehavior
{
    public void ApplyDispatchBehavior(ServiceDescription serviceDescription,
        ServiceHostBase serviceHostBase)
    {
            foreach (var endpoint in serviceDescription.Endpoints)
                endpoint.EndpointBehaviors.Add(new CustomInspectorEndpointBehavior());
    }

    ...
}

最后，您可以从代码中应用端点行为...

var host = new ServiceHost(typeof(TheService));

foreach (var endpoint in host.Description.Endpoints)
    endpoint.EndpointBehaviors.Add(new CustomInspectorEndpointBehavior(c));

（在服务行为的情况下）

var host = new ServiceHost(typeof(TheService));

host.Description.Behaviors.Add(new MultipleInspectorsServiceBehavior());

...或来自配置：

<system.serviceModel>
  <extensions>
    <behaviorExtensions>
      <add name="customInspectorEndpointBehavior"
           type="CustomInspectorEndpointBehaviorExtensionElement, MyAssembly" />
    </behaviorExtensions>
  </extensions>
  <behaviors>
    <endpointBehaviors>
      <behavior name="behavior1">
        <customInspectorEndpointBehavior />
        <!--maybe some other behaviors-->
      </behavior>
      <behavior name="behavior2">
        <customInspectorEndpointBehavior />
        <!--maybe some other behaviors-->
      </behavior>
    </endpointBehaviors>
  </behaviors>
  <services>
    <service name="TheService">
      <endpoint address="address1" ... contract="..." behaviorConfiguration="behavior1" />
      <endpoint address="address2" ... contract="..." behaviorConfiguration="behavior1" />
      <endpoint address="address3" ... contract="..." behaviorConfiguration="behavior2" />
    </service>
  </services>
</system.serviceModel>

对于服务行为：

<system.serviceModel>
  <extensions>
    <behaviorExtensions>
      <add name="multipleInspectorsServiceBehavior"
           type="MultipleInspectorsServiceBehaviorExtensionElement, MyAssembly" />
    </behaviorExtensions>
  </extensions>
  <behaviors>
    <serviceBehaviors>
      <behavior name="CustomServiceBehavior">
        <multipleInspectorsServiceBehavior />
      <!--maybe some others-->
      </behavior>
    </serviceBehaviors>
  </behaviors>
  <services>
    <service name="TheService" behaviorConfiguration="ServiceBehavior">
      <endpoint address="address1" ... contract="..." />
      <endpoint address="address2" ... contract="..." />
      <endpoint address="address3" ... contract="..." />
    </service>
  </services>
</system.serviceModel>

在这里你应该创建一个BehaviorExtensionElement 来引用配置中的行为：

class CustomInspectorEndpointBehaviorExtensionElement : BehaviorExtensionElement
{
    public override Type BehaviorType
    {
        get
        {
            return typeof(CustomInspectorEndpointBehavior);
        }
    }

    protected override object CreateBehavior()
    {
        return new CustomInspectorEndpointBehavior();
    }
}

class MultipleInspectorsServiceBehaviorExtensionElement : BehaviorExtensionElement
{
    public override Type BehaviorType
    {
        get
        {
            return typeof(MultipleInspectorsServiceBehavior);
        }
    }

    protected override object CreateBehavior()
    {
        return new MultipleInspectorsServiceBehavior();
    }
}

【讨论】：