Question

我正在使用具有多个操作的WCF服务，此服务要求我在调用任何操作时添加传出消息属性。

目前我只是在代码中调用服务时添加属性。

以下是我的代码：

using (new OperationContextScope(client.InnerChannel))
{
      OperationContext.Current.OutgoingMessageProperties.Add("P1", "Test User");
      OperationContext.Current.OutgoingMessageProperties.Add("P2", "Test Type");
      response = client.process(request);
}

如何创建动态添加这些消息属性的WCF扩展？

我对扩展知之甚少，但还不足以拦截和添加这些标题。

Answer 1

要自动为邮件添加一些标题，您必须实施 IClientMessageInspector 。它允许您为外发消息更改任何内容。

编辑2：

public class ClientMessageInspector : IClientMessageInspector
{
    public object BeforeSendRequest(ref Message request, IClientChannel channel)
    {
        //following example is for adding http header.   
        //If you have another protocol you can add any other message  
        //manipulation code instead.

        //HttpResponseMessageProperty.Name returns "httpResponse".

        HttpResponseMessageProperty httpProp = null;
        if (request.Properties.ContainsKey(HttpResponseMessageProperty.Name))
        {
            httpProp = (HttpResponseMessageProperty)request.Properties[HttpResponseMessageProperty.Name];
        }
        else
        {
            httpProp = new HttpResponseMessageProperty();
            request.Properties.Add(HttpResponseMessageProperty.Name, httpProp);
        }

        httpProp.Headers.Add("YouHeader", "YourValue");

        //as I mentioned you can change a message in a way you need
        request.Properties.Add("P1", "Test User");
        request.Headers.Add(MessageHeader.CreateHeader("P1", "htt p://site.com/", "Test User"));

        return null;
    }

    public void AfterReceiveReply(ref Message reply, object correlationState) { }
}

public class ClientMessageInspectorBehavior : IEndpointBehavior
{
    public void AddBindingParameters(ServiceEndpoint endpoint, BindingParameterCollection bindingParameters)
    {
    }

    public void ApplyClientBehavior(ServiceEndpoint endpoint, ClientRuntime clientRuntime)
    {
        clientRuntime.MessageInspectors.Add(new ClientMessageInspector());
    }

    public void ApplyDispatchBehavior(ServiceEndpoint endpoint, EndpointDispatcher endpointDispatcher)
    {

    }

    public void Validate(ServiceEndpoint endpoint)
    {
    }
}

public class ClientMessageInspectorExtensionElement : BehaviorExtensionElement
{
    protected override object CreateBehavior()
    {
        return new ClientMessageInspectorBehavior();
    }

    public override Type BehaviorType
    {
        get
        {
            return typeof(ClientMessageInspectorBehavior);
        }
    }
}

您的配置文件应如下所示：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>

  <system.serviceModel>
    <client>
          <endpoint 
            address="http://localhost:8000/CoolerService" 
            behaviorConfiguration="coolerBehaviour" 
            binding="webHttpBinding"
            contract="CoolerService.ICoolerService"
            name="coolerEndpoint">
          </endpoint>
    </client>

    <extensions>
      <behaviorExtensions>
        <add name="customHeaderAdder" type="Extensions.ClientMessageInspectorExtensionElement, Extensions" />
      </behaviorExtensions>
    </extensions>

    <behaviors>
      <endpointBehaviors>
        <behavior name="coolerBehaviour">
          <customHeaderAdder />
        </behavior>
      </endpointBehaviors>
    </behaviors>

  </system.serviceModel>

</configuration>

Answer 2

实现IClientMessageInspector，就像前面的回答所说的那样，但是如果你想添加HTTP头，请使用类似的代码块，就像你使用过的那样 - 在BeforeSendRequest中。

using (new OperationContextScope((IContextChannel)channel))
{
      OperationContext.Current.OutgoingMessageProperties.Add("P1", "Test User");
      OperationContext.Current.OutgoingMessageProperties.Add("P2", "Test Type");
      response = client.process(request);
}

Answer 3

在我看来，您只需设置OperationContext.Current而无需像这样创建OperationScope：

OperationContext.Current = new OperationContext(client.InnerChannel);
OperationContext.Current.OutgoingMessageProperties.Add("P1", "Test User");

这可能看起来像是一种不好的做法，但是如果你看一下documentation，你会发现OperationContext.Current属性是实际上限定为当前线程（使用ThreadStatic属性），因此线程安全。

请注意，同一线程中的client的其他实例不会添加消息属性，因为OperationContext绑定到客户端通道。

WCF扩展，用于动态地在客户端添加传出消息属性

3 个答案: