如何：通过自定义绑定检索元数据

本主题说明如何通过自定义绑定检索 MEX 终结点中的元数据。本示例中的代码基于Custom Secure Metadata Endpoint示例。

通过自定义绑定检索元数据

1. 确定由 MEX 终结点使用的绑定。对于 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，应该将 MEX 终结点配置添加到 Svcutil.exe 的配置文件 (Svcutil.exe.config) 中，并且终结点配置的名称应该与 MEX 终结点地址的 URI 架构匹配。

     <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。可以采用两种方式执行此操作：在配置中指定自定义绑定，或在代码中指定自定义绑定：

   // The custom binding is specified in configuration.
   EndpointAddress mexAddress = new EndpointAddress("https://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. 创建一个 WsdlImporter 并调用 ImportAllEndpoints：

   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，请参见如何：将元数据导入服务终结点。

另请参见

概念

元数据