如何从Silverlight中的WCF服务响应中获取自定义SOAP头？ [英] How to get custom SOAP header from WCF service response in Silverlight?

问题描述

在服务器端新的MessageHeader添加到响应标头中：

  OperationContext.Current.OutgoingMessageHeaders.Add（MessageHeader.CreateHeader（headerName，headerNS，The header value））; 
  

我可以在Fiddler中看到这个标题：

：Envelope [
xmlns：s = http：//schemas.xmlsoap.org/soap/envelope/
]

Header

headerName [xmlns = headerNS]
标题值

但是，我找不到在Silverlight应用程序服务回调中读取标头值的方法：

  using（new OperationContextScope（proxy.InnerChannel））
 {
 var headers = OperationContext.Current.IncomingMessageHeaders; 
 //标题为空:( 
 
）
  

任何人遇到过类似的问题？

解决方案

在Silverlight的响应中获取SOAP标题并不像应该那样容易。使用基于事件的回调，你运气不好 - 它只是不起作用，你需要使用Begin / End-style操作调用，如下例所示。

  void Button_Click（...）
 {
 MyClient client = new MyClient（）; 
 IClient proxy =（IClient）client; //需要转换到[ServiceContract]接口
 proxy.BeginOperation（hello，delegate（IAsyncResult asyncResult）
 {
 using（new OperationContextScope（client.InnerChannel））
 {
 proxy.EndOperation（asyncResult）; 
 var headers = OperationContext.Current.IncomingMessageHeaders; 
 //现在你可以访问它了
} 
}）; 
} 
  

请注意，您无法直接使用生成的客户端（来自slsvcutil / add服务引用），您需要将其转换为接口，因为Begin / End方法没有在客户端类中暴露（明确实现）。

I'm trying to get custom response message header in Silverlight application.

on server-side new MessageHeader added to response headers:

OperationContext.Current.OutgoingMessageHeaders.Add(MessageHeader.CreateHeader("headerName", "headerNS", "The header value"));

and I can see this header in Fiddler:

s:Envelope [ xmlns:s=http://schemas.xmlsoap.org/soap/envelope/ ]

s:Header

headerName [ xmlns=headerNS ] The header value

But, I can't find a way to read header value in Silverlight application service callback:

            using (new OperationContextScope(proxy.InnerChannel))
            {
                var headers = OperationContext.Current.IncomingMessageHeaders;
                // headers is null :(

            }

Does anyone encountered with similar issue?

解决方案

Getting SOAP headers in responses on Silverlight isn't as easy as it should be. If you use the event-based callbacks, you're out of luck - it just doesn't work. You need to use the Begin/End-style operation call, like in the example below.

void Button_Click(...)
{
   MyClient client = new MyClient();
   IClient proxy = (IClient)client; // need to cast to the [ServiceContract] interface
   proxy.BeginOperation("hello", delegate(IAsyncResult asyncResult)
   {
      using (new OperationContextScope(client.InnerChannel))
      {
         proxy.EndOperation(asyncResult);
         var headers = OperationContext.Current.IncomingMessageHeaders;
         // now you can access it.
      }
   });
}

Notice that you cannot use the generated client (from slsvcutil / add service reference) directly, you need to cast it to the interface, since the Begin/End methods are not exposed (explicitly implemented) on the client class.

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