所以我的問題是:當服務是asmx時,我無法使用生成的wcf代理(服務引用)從Web服務響應中獲取頭。如何從使用WCF客戶端的響應中讀取自定義SOAP頭
ManagerSoapClient client = new ManagerSoapClient();
client.Authenticate(...);
using (OperationContextScope scope = new OperationContextScope(client.InnerChannel))
{
//headers = null
var headers = OperationContext.Current.IncomingMessageHeaders;
}
這很奇怪,因爲SOAP響應有一些頭:
<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,我添加了自定義IClientMessageInspector
檢查標題:
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/");
}
}
於是就有畢竟是一個頭..但爲什麼我不能使用OperationContext.Current.IncomingMessageHeaders
訪問它?
好的。現在我只想將此標題保存在某個地方,以便在服務呼叫後能夠訪問它。我決定使用擴展IExtension<OperationContext>
所以我的代碼,現在是下一個:
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()); }
}
它應該工作,卻不料我OperationContext.Current.Extensions.Find<OperationResultContextExtension>();
是null
爲好。
因此,有我的問題:
1.爲什麼OperationContext.Current.IncomingMessageHeaders
返回null
而reply.Headers.FindHeader
發現裏面AfterReceiveReply
2.擴展OperationResultContextExtension
正確的頭看起來相當順利,爲什麼我在OperationContext.Current.Extensions.Find<OperationResultContextExtension>()
得到null
。
3.是否有一些更好/更簡單或至少有效的方式從響應中獲取這個頭文件?
我試過這個方法裏面,但是在「標題」對象的所有字段都爲空,即使在Fiddler中我可以看到諸如Action,To和From等標題字段。有任何想法嗎? – AntonK 2015-08-02 23:10:10