如何：通过非 MEX 绑定检索元数据

本主题介绍如何通过非 MEX 绑定从 MEX 终结点检索元数据。 此示例中的代码基于自定义安全元数据终结点示例。

通过非 MEX 绑定检索元数据

1. 确定由 MEX 终结点使用的绑定。 对于 Windows Communication Foundation (WCF) 服务，可以通过访问服务的配置文件来确定 MEX 绑定。 在本例中，MEX 绑定在以下服务配置中定义。

   <services>  
       <service name="Microsoft.ServiceModel.Samples.CalculatorService"  
               behaviorConfiguration="CalculatorServiceBehavior">  
        <!-- Use the base address provided by the host. -->  
        <endpoint address=""  
          binding="wsHttpBinding"  
          bindingConfiguration="Binding2"  
          contract="Microsoft.ServiceModel.Samples.ICalculator" />  
        <endpoint address="mex"  
          binding="wsHttpBinding"  
          bindingConfiguration="Binding1"  
          contract="IMetadataExchange" />  
        </service>  
    </services>  
    <bindings>  
      <wsHttpBinding>  
        <binding name="Binding1">  
          <security mode="Message">  
            <message clientCredentialType="Certificate" />  
          </security>  
        </binding>  
        <binding name="Binding2">  
          <reliableSession inactivityTimeout="00:01:00" enabled="true" />  
          <security mode="Message">  
            <message clientCredentialType="Certificate" />  
          </security>  
        </binding>  
      </wsHttpBinding>  
    </bindings>  
   

2. 在客户端配置文件中，配置同样的自定义绑定。 在该配置文件中，客户端还定义了一个 clientCredentials 行为以提供证书，用于在请求 MEX 终结点中的元数据时对服务进行身份验证。 在使用 Svcutil.exe 通过自定义绑定请求元数据时，应向 Svcutil.exe 的配置文件 (Svcutil.exe.config) 中添加 MEX 终结点配置，并且终结点配置的名称应与 MEX 终结点地址的 URI 架构匹配，如下面的代码所示。

   <system.serviceModel>  
     <client>  
       <endpoint name="http"  
                 binding="wsHttpBinding"  
                 bindingConfiguration="Binding1"  
                 behaviorConfiguration="ClientCertificateBehavior"  
                 contract="IMetadataExchange" />  
     </client>  
     <bindings>  
       <wsHttpBinding>  
         <binding name="Binding1">  
           <security mode="Message">  
             <message clientCredentialType="Certificate"/>  
           </security>  
         </binding>  
       </wsHttpBinding>  
     </bindings>  
     <behaviors>  
       <endpointBehaviors>  
         <behavior name="ClientCertificateBehavior">  
           <clientCredentials>  
             <clientCertificate findValue="client.com" storeLocation="CurrentUser" storeName="My" x509FindType="FindBySubjectName" />  
             <serviceCertificate>  
               <authentication certificateValidationMode="PeerOrChainTrust" />  
             </serviceCertificate>  
           </clientCredentials>  
         </behavior>  
       </endpointBehaviors>  
     </behaviors>
   </system.serviceModel>  
   

3. 创建一个 MetadataExchangeClient 并调用 GetMetadata。 有两种方法可以完成此操作：在配置中指定自定义绑定，或在代码中指定自定义绑定，如下面的示例所示。

   // The custom binding is specified in configuration.  
   EndpointAddress mexAddress = new EndpointAddress("http://localhost:8000/ServiceModelSamples/Service/mex");  
   
   MetadataExchangeClient mexClient = new MetadataExchangeClient("http");  
   mexClient.ResolveMetadataReferences = true;  
   MetadataSet mexSet = mexClient.GetMetadata(mexAddress);  
   
   // The custom binding is specified in code.  
   // Specify the Metadata Exchange binding and its security mode.  
   WSHttpBinding mexBinding = new WSHttpBinding(SecurityMode.Message);  
   mexBinding.Security.Message.ClientCredentialType = MessageCredentialType.Certificate;  
   
   // Create a MetadataExchangeClient and set the certificate details.  
   MetadataExchangeClient mexClient = new MetadataExchangeClient(mexBinding);  
   mexClient.SoapCredentials.ClientCertificate.SetCertificate(  
       StoreLocation.CurrentUser, StoreName.My,  
       X509FindType.FindBySubjectName, "client.com");  
   mexClient.SoapCredentials.ServiceCertificate.Authentication.  
       CertificateValidationMode =  
       X509CertificateValidationMode.PeerOrChainTrust;  
   mexClient.SoapCredentials.ServiceCertificate.SetDefaultCertificate(  
       StoreLocation.CurrentUser, StoreName.TrustedPeople,  
       X509FindType.FindBySubjectName, "localhost");  
   MetadataExchangeClient mexClient2 = new MetadataExchangeClient(customBinding);  
   mexClient2.ResolveMetadataReferences = true;  
   MetadataSet mexSet2 = mexClient2.GetMetadata(mexAddress);  
   

4. 创建 WsdlImporter 并调用 ImportAllEndpoints，如下面的代码所示。

   WsdlImporter importer = new WsdlImporter(mexSet);  
   ServiceEndpointCollection endpoints = importer.ImportAllEndpoints();  
   

5. 此时，您拥有服务终结点的集合。 有关导入元数据的更多信息，请参阅如何将元数据导入服务终结点。

另请参阅

• Metadata