我正在构建一个WCF路由器,我的客户端使用可靠会话。在这种情况下,当客户端打开通道时,将发送一条消息(建立可靠会话?)。其内容如下:
当可靠的会话被打开时,消息包含这个自定义头。
当我的客户端发起服务调用时,消息中包含自定义标头,但建立可靠会话的消息仍然不包含它。因此,我的问题是:如何以编程方式向终结点添加自定义标头,以便可靠会话消息包含它?感谢您的帮助。
<s:Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope" xmlns:a="http://www.w3.org/2005/08/addressing">
<s:Header>
<a:Action s:mustUnderstand="1">http://docs.oasis-open.org/ws-rx/wsrm/200702/CreateSequence</a:Action>
<a:MessageID>urn:uuid:1758f794-c5d3-4573-b252-7a07344cc257</a:MessageID>
<a:To s:mustUnderstand="1">http://localhost:8010/RouterService</a:To>
</s:Header>
<s:Body>
<CreateSequence xmlns="http://docs.oasis-open.org/ws-rx/wsrm/200702">
<AcksTo>
<a:Address>http://www.w3.org/2005/08/addressing/anonymous</a:Address>
</AcksTo>
<Offer>
<Identifier>urn:uuid:64a12658-71d9-4967-88ec-9bb0610f7ecb</Identifier>
<Endpoint>
<a:Address>http://www.w3.org/2005/08/addressing/anonymous</a:Address>
</Endpoint>
<IncompleteSequenceBehavior>DiscardFollowingFirstGap</IncompleteSequenceBehavior>
</Offer>
</CreateSequence>
</s:Body>
</s:Envelope>
这里的问题在于头部没有包含任何信息,我无法使用它来查找将消息路由到哪个服务。在Busatmante的路由器示例代码中,她通过向终端添加一个标题来解决这个问题:
<client>
<endpoint address="http://localhost:8010/RouterService" binding="ws2007HttpBinding"
bindingConfiguration="wsHttp"
contract="localhost.IMessageManagerService" >
<headers>
<Route xmlns="http://www.thatindigogirl.com/samples/2008/01" >http://www.thatindigogirl.com/samples/2008/01/IMessageManagerService</Route>
</headers>
</endpoint>
</client>
当可靠的会话被打开时,消息包含这个自定义头。
<Route a:IsReferenceParameter="true" xmlns="http://www.thatindigogirl.com/samples/2008/01">http://www.thatindigogirl.com/samples/2008/01/IMessageManagerService</Route>
这很好,但是我有一个要求需要通过编程来配置客户端。我想到ChannelFactory Endpoint应该有一个Header对象,我可以手动添加自定义标头。不幸的是它没有。所以我进行了一些搜索,并发现一些推荐实现IClientMessageInspector扩展WCF来添加我的标头,并将其作为行为添加到我的终结点。
public class ContractNameMessageInspector : IClientMessageInspector {
private const string HEADER_NAME = "ContractName";
private readonly string _ContractName;
public ContractNameMessageInspector(string contractName) {
_ContractName = contractName;
}
#region IClientMessageInspector Members
public void AfterReceiveReply(ref Message reply, object correlationState) { }
public object BeforeSendRequest(ref Message request, IClientChannel channel) {
HttpRequestMessageProperty httpRequestMessage;
object httpRequestMessageObject;
if (request.Properties.TryGetValue(HttpRequestMessageProperty.Name, out httpRequestMessageObject)) {
httpRequestMessage = httpRequestMessageObject as HttpRequestMessageProperty;
if (httpRequestMessage != null && string.IsNullOrEmpty(httpRequestMessage.Headers[HEADER_NAME])) {
httpRequestMessage.Headers[HEADER_NAME] = this._ContractName;
}
}
else {
httpRequestMessage = new HttpRequestMessageProperty();
httpRequestMessage.Headers.Add(HEADER_NAME, this._ContractName);
request.Properties.Add(HttpRequestMessageProperty.Name, httpRequestMessage);
}
return null;
}
#endregion
}
当我的客户端发起服务调用时,消息中包含自定义标头,但建立可靠会话的消息仍然不包含它。因此,我的问题是:如何以编程方式向终结点添加自定义标头,以便可靠会话消息包含它?感谢您的帮助。