MVC 应用程序中基于 MessageContract 的 WCF 服务不会提供元数据

Question

我一直在阅读有关在 MVC 应用程序中托管 WCF 服务的所有问题，但遗憾的是，我没有找到有关指定 MessageContracts 的服务的太多信息。我需要进行流文件传输，所以如果我想接受有关流的元数据，我必须在消息合同中指定标头。

我已将此服务添加到我的 MVC 应用程序并添加了 ServiceRoute;浏览器无法按预期获取 WSDL，Visual Studio 无法获取生成客户端代理类所需的服务元数据。两者都收到如下错误：

Operation 'ImportMessageBody' in contract 'IImport' uses a MessageContract that has 
SOAP headers. SOAP headers are not supported by the None MessageVersion.

相关的堆栈跟踪：

[InvalidOperationException: Operation 'ImportMessageBody' in contract 'IImport' uses a MessageContract that has SOAP headers. SOAP headers are not supported by the None MessageVersion.]
   System.ServiceModel.Description.WebHttpBehavior.ValidateNoMessageContractHeaders(MessageDescription md, String opName, String contractName) +704271
   System.ServiceModel.Description.WebHttpBehavior.ValidateContract(ServiceEndpoint endpoint) +134
   System.ServiceModel.Description.WebHttpBehavior.Validate(ServiceEndpoint endpoint) +51
   System.ServiceModel.Description.ServiceEndpoint.Validate(Boolean runOperationValidators, Boolean isForService) +287
   System.ServiceModel.Description.DispatcherBuilder.ValidateDescription(ServiceDescription description, ServiceHostBase serviceHost) +271
   System.ServiceModel.Description.DispatcherBuilder.InitializeServiceHost(ServiceDescription description, ServiceHostBase serviceHost) +109
   System.ServiceModel.ServiceHostBase.InitializeRuntime() +60
   System.ServiceModel.ServiceHostBase.OnBeginOpen() +27
   System.ServiceModel.ServiceHostBase.OnOpen(TimeSpan timeout) +50
   System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout) +318
   System.ServiceModel.Channels.CommunicationObject.Open() +36
   System.ServiceModel.HostingManager.ActivateService(String normalizedVirtualPath) +184
   System.ServiceModel.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath) +615

[ServiceActivationException: The service '/a/import' cannot be activated due to an exception during compilation.  The exception message is: Operation 'ImportMessageBody' in contract 'IImport' uses a MessageContract that has SOAP headers. SOAP headers are not supported by the None MessageVersion..]
   System.Runtime.AsyncResult.End(IAsyncResult result) +679246
   System.ServiceModel.Activation.HostedHttpRequestAsyncResult.End(IAsyncResult result) +190
   System.ServiceModel.Activation.AspNetRouteServiceHttpHandler.EndProcessRequest(IAsyncResult result) +6
   System.Web.CallHandlerExecutionStep.OnAsyncHandlerCompletion(IAsyncResult ar) +96

WcfTestClient 也有同样的问题（如我所料）。

我需要做什么才能启用客户端代理生成？

这是我的 MVC 应用程序的 web.config 文件的 serviceModel 部分：

  <system.serviceModel>
    <behaviors>
      <serviceBehaviors>
        <behavior name="">
          <serviceMetadata httpGetEnabled="true" />
          <serviceDebug includeExceptionDetailInFaults="true" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <serviceHostingEnvironment multipleSiteBindingsEnabled="true" aspNetCompatibilityEnabled="true" />
  </system.serviceModel>

还有我添加的路线：

public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
            routes.IgnoreRoute("{resource}.svc/{*pathInfo}");
            routes.IgnoreRoute("favicon.ico");

            routes.Add(new ServiceRoute("a/import", new WebServiceHostFactory(), typeof(Services.Import.Import)));
            routes.MapRoute(
                "Default", // Route name
                "{controller}/{action}/{id}", // URL with parameters
                new { controller = "Home", action = "Index", id = UrlParameter.Optional } // Parameter defaults
            );
        }

Answer 1

您正在通过 WebServiceHostFactory 托管服务，这意味着您正在创建一个 REST 端点。

MessageContract 的目的是定义 SOAP 消息（标头和正文），因此使用 WebServiceHostFactory 创建的服务不支持它们

您的意思是使用 SOAP 端点而不是 REST 端点吗？