如何：通过非 MEX 绑定检索元数据

项目
02/28/2011

本主题介绍如何通过非 MEX 绑定从 MEX 终结点检索元数据。本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

确定 MEX 终结点所使用的绑定。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>

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>

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("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);

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

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

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

通过

如何：通过非 MEX 绑定检索元数据

通过非 MEX 绑定检索元数据

另请参见

概念

其他资源