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为了显示我的问题，我创建了一个简单的 WCF 服务，其操作使用带有[MessageContract]属性的消息类。此消息包含MyHeader属性并使用属性进行注释[MessageHeader]。

[MessageContract] public class HeaderedMessage
{
    [MessageHeader] public string MyHeader { get; set; }
}

[ServiceContract] public interface IService
{
    [OperationContract] void GetDataUsingDataContract(HeaderedMessage headered);
}

public class Service : IService
{
    public void GetDataUsingDataContract(HeaderedMessage headered) { }
}

然后我尝试使用以下命令为 Silverlight 4（或 5）生成代理类SlSvcUtil.exe：

slsvcutil.exe http://localhost:8732/Design_Time_Addresses/MessageHeaderedService/?wsdl

没有任何警告，消息头在生成的类中被完全忽略。因此，HeaderedMessage 根本不包含任何属性。

[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "4.0.0.0")]
[System.ServiceModel.MessageContractAttribute(WrapperName="HeaderedMessage", WrapperNamespace="http://tempuri.org/", IsWrapped=true)]
public partial class HeaderedMessage
{
    public HeaderedMessage()
    {
    }
}

我没有在 MSDN 或通过 Google 搜索找到任何关于这种奇怪行为的信息。还有其他人有这个问题吗？

我还尝试使用可移植类库扩展直接通过Silverlight 应用程序使用IService合同。ChannelFactory由于System.ServiceModelSilverlight 的程序集不包含MessageHeaderAttribute无法编译的类。

更新：缺少生成的 WSDL 和 WCFSystem.ServiceModel部分：

<wsdl:definitions xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:wsx="http://schemas.xmlsoap.org/ws/2004/09/mex" xmlns:wsa10="http://www.w3.org/2005/08/addressing" xmlns:tns="http://tempuri.org/" xmlns:soap12="http://schemas.xmlsoap.org/wsdl/soap12/" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" xmlns:wsp="http://schemas.xmlsoap.org/ws/2004/09/policy" xmlns:wsap="http://schemas.xmlsoap.org/ws/2004/08/addressing/policy" xmlns:msc="http://schemas.microsoft.com/ws/2005/12/wsdl/contract" xmlns:wsa="http://schemas.xmlsoap.org/ws/2004/08/addressing" xmlns:wsam="http://www.w3.org/2007/05/addressing/metadata" xmlns:wsaw="http://www.w3.org/2006/05/addressing/wsdl" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" name="Service" targetNamespace="http://tempuri.org/">
  <wsdl:types>
    <xsd:schema targetNamespace="http://tempuri.org/Imports">
      <xsd:import schemaLocation="http://localhost:8732/Design_Time_Addresses/MessageHeaderedService/?xsd=xsd0" namespace="http://tempuri.org/"/>
      <xsd:import schemaLocation="http://localhost:8732/Design_Time_Addresses/MessageHeaderedService/?xsd=xsd1" namespace="http://schemas.microsoft.com/2003/10/Serialization/"/>
    </xsd:schema>
  </wsdl:types>
  <wsdl:message name="HeaderedMessage">
    <wsdl:part name="parameters" element="tns:HeaderedMessage"/>
  </wsdl:message>
  <wsdl:message name="HeaderedMessage_Headers">
    <wsdl:part name="MyHeader" element="tns:MyHeader"/>
  </wsdl:message>
  <wsdl:message name="IService_GetDataUsingDataContract_OutputMessage"/>
  <wsdl:portType name="IService">
    <wsdl:operation name="GetDataUsingDataContract">
      <wsdl:input wsaw:Action="http://tempuri.org/IService/GetDataUsingDataContract" name="HeaderedMessage" message="tns:HeaderedMessage"/>
      <wsdl:output wsaw:Action="http://tempuri.org/IService/GetDataUsingDataContractResponse" message="tns:IService_GetDataUsingDataContract_OutputMessage"/>
    </wsdl:operation>
  </wsdl:portType>
  <wsdl:binding name="BasicHttpBinding_IService" type="tns:IService">
    <soap:binding transport="http://schemas.xmlsoap.org/soap/http"/>
    <wsdl:operation name="GetDataUsingDataContract">
      <soap:operation soapAction="http://tempuri.org/IService/GetDataUsingDataContract" style="document"/>
      <wsdl:input name="HeaderedMessage">
        <soap:header message="tns:HeaderedMessage_Headers" part="MyHeader" use="literal"/>
        <soap:body use="literal"/>
      </wsdl:input>
      <wsdl:output>
        <soap:body use="literal"/>
      </wsdl:output>
    </wsdl:operation>
  </wsdl:binding>
  <wsdl:service name="Service">
    <wsdl:port name="BasicHttpBinding_IService" binding="tns:BasicHttpBinding_IService">
      <soap:address location="http://localhost:8732/Design_Time_Addresses/MessageHeaderedService/"/>
    </wsdl:port>
  </wsdl:service>
</wsdl:definitions>

WCF 配置：

<system.serviceModel>
  <services>
    <service name="MessageHeaderedService.Service">
      <host>
        <baseAddresses>
          <add baseAddress = "http://localhost:8732/Design_Time_Addresses/MessageHeaderedService/" />
        </baseAddresses>
      </host>
      <endpoint address ="" binding="basicHttpBinding" contract="MessageHeaderedService.IService">
      </endpoint>
      <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
    </service>
  </services>
  <behaviors>
    <serviceBehaviors>
      <behavior>
        <serviceMetadata httpGetEnabled="True"/>
        <serviceDebug includeExceptionDetailInFaults="False" />
      </behavior>
    </serviceBehaviors>
  </behaviors>
</system.serviceModel>
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