如何从使用WCF客户端的响应中读取自定义SOAP头

Question

所以我的问题是：当服务是asmx时，我无法使用生成的wcf代理（服务引用）从Web服务响应中获取头。

ManagerSoapClient client = new ManagerSoapClient(); 
client.Authenticate(...); 
using (OperationContextScope scope = new OperationContextScope(client.InnerChannel)) 
{ 
    //headers = null 
    var headers = OperationContext.Current.IncomingMessageHeaders; 
} 

这很奇怪，因为SOAP响应有一些头：

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> 
    <soap:Header> 
     <OperationResult xmlns="http://tempuri.org/"> 
     <Status>Success</Status> 
     </OperationResult> 
    </soap:Header> 
    <soap:Body> 
     ... 
    </soap:Body> 
</soap:Envelope> 

好吧，我添加了自定义IClientMessageInspector检查标题：

public class OperationResultMessageInspector : IClientMessageInspector 
{ 
    public object BeforeSendRequest(ref Message request, IClientChannel channel) 
    {   
     return channel; 
    } 

    public void AfterReceiveReply(ref Message reply, object correlationState) 
    { 
     //It founds header at position 0!! 
     int headerIndex = reply.Headers.FindHeader("OperationResult", "http://tempuri.org/"); 
    } 
} 

于是就有毕竟是一个头..但为什么我不能使用OperationContext.Current.IncomingMessageHeaders访问它？

好的。现在我只想将此标题保存在某个地方，以便在服务呼叫后能够访问它。我决定使用扩展IExtension<OperationContext>
所以我的代码，现在是下一个：

public class ManagerProxy 
{ 
    public void Authenticate() 
    { 
     ManagerSoapClient client = new ManagerSoapClient(); 
     client.Endpoint.Behaviors.Add(new OperationResultBehavior()); 
     client.Authenticate(...); 

     using (OperationContextScope scope = new OperationContextScope(client.InnerChannel)) 
     { 
      //headers = null 
      var headers = OperationContext.Current.IncomingMessageHeaders; 
      //header = null 
      OperationResultContextExtension header = OperationContext.Current.Extensions.Find<OperationResultContextExtension>(); 
     } 
    } 
} 

public class OperationResultMessageInspector : IClientMessageInspector 
{ 
    public object BeforeSendRequest(ref Message request, IClientChannel channel) 
    {   
     return channel; 
    } 

    public void AfterReceiveReply(ref Message reply, object correlationState) 
    { 
     IClientChannel channel = (IClientChannel)correlationState; 

     //It founds header at position 0!! 
     int headerIndex = reply.Headers.FindHeader("OperationResult", "http://tempuri.org/"); 
     XmlDictionaryReader reader = reply.Headers.GetReaderAtHeader(headerIndex); 

     OperationResultContextExtension extension = new OperationResultContextExtension 
     { 
      SomeData = reader.ReadString() 
     };   

     using (OperationContextScope scope = new OperationContextScope(channel)) 
     {    
      OperationContext.Current.Extensions.Add(extension); 
     } 
     reader.Close(); 
    } 

} 

public class OperationResultContextExtension : IExtension<OperationContext> 
{ 
    public string SomeData { get; set; } 
    public void Attach(OperationContext owner) { } 
    public void Detach(OperationContext owner) { } 
} 

public class OperationResultBehavior : IEndpointBehavior 
{ 
    public void AddBindingParameters(ServiceEndpoint endpoint, BindingParameterCollection bindingParameters) { } 
    public void ApplyDispatchBehavior(ServiceEndpoint endpoint, EndpointDispatcher endpointDispatcher) { } 
    public void Validate(ServiceEndpoint endpoint) { } 
    public void ApplyClientBehavior(ServiceEndpoint endpoint, ClientRuntime clientRuntime) 
    { clientRuntime.MessageInspectors.Add(new OperationResultMessageInspector()); } 
} 

它应该工作，却不料我OperationContext.Current.Extensions.Find<OperationResultContextExtension>();是null为好。

因此，有我的问题：
1.为什么OperationContext.Current.IncomingMessageHeaders返回null而reply.Headers.FindHeader发现里面AfterReceiveReply
2.扩展OperationResultContextExtension正确的头看起来相当顺利，为什么我在OperationContext.Current.Extensions.Find<OperationResultContextExtension>()得到null。
3.是否有一些更好/更简单或至少有效的方式从响应中获取这个头文件？

Answer 1

我也有类似的问题这一点，在我的情况我解决它通过将客户呼叫OperationContestScope

ManagerSoapClient client = new ManagerSoapClient(); 

using (OperationContextScope scope = new OperationContextScope(client.InnerChannel)) 
{ 
    client.Authenticate(...); // <---- The change 
    var headers = OperationContext.Current.IncomingMessageHeaders; 
}