使用 ServiceRoute 时指定 WCF 绑定

Question

我目前正在使用以下代码注册 WCF 服务：

var factory = new DefaultServiceHostFactory();
RouteTable.Routes.Add(new ServiceRoute("XXXEndPoint", factory, IXXXEndPoint)));

这一切都很好，但是我还需要更改阅读器配额设置的 MaxStringContentLength 属性。似乎使用了默认值 8192，不管我是否尝试更改它，我猜这是来自 DefaultServiceModel？

是否有任何合适的钩子来覆盖 DefaultServiceModel 上的此设置，或者我应该派生自己的服务主机/模型类，还是我这样做的方式错误？

任何建议表示赞赏。

编辑：请注意，绑定的配置必须以编程方式执行（而不是通过配置文件）。

谢谢

Answer 1

您可以通过扩展主机工厂来实现。 通过对下面的代码稍加修改，您可以将附加参数传递给 WCFServiceHostFactory 以从 Global.asax 进行设置 我使用下面的类始终将其设置为 Int32.MaxValue

//在 Global.asax 中

routes.Add(new ServiceRoute(routePrefix,
            new WCFServiceHostFactory(),
            serviceType));

//WCFServiceHostFactory.cs

namespace MyServices.MyService
{
    public class WCFServiceHostFactory:WebServiceHostFactory
    {
        protected override ServiceHost CreateServiceHost(Type serviceType, Uri[] baseAddresses)
        {
            WCFServiceHost host = new WCFServiceHost(serviceType, baseAddresses);

            return host;
        }
    }
}

//WCFServiceHost.cs

namespace MyServices.MyService
{
    public class WCFServiceHost:WebServiceHost
    {
        public WCFServiceHost(): base ()
        {
        }

        public WCFServiceHost (object singletonInstance, params Uri [] baseAddresses)
          : base (singletonInstance, baseAddresses)
        {
        }

        public WCFServiceHost(Type serviceType, params Uri[] baseAddresses)
          : base (serviceType, baseAddresses)
        {
        }



        protected override void OnOpening ()
        {
          base.OnOpening ();

          foreach (Uri baseAddress in BaseAddresses) {
            bool found = false;
            foreach (ServiceEndpoint se in Description.Endpoints)
                if (se.Address.Uri == baseAddress)
                {
                    found = true;
                    ((WebHttpBinding)se.Binding).ReaderQuotas.MaxStringContentLength = Int32.MaxValue;//here you set it and also set it below
                }
            if (!found) {
              if (ImplementedContracts.Count > 1)
                throw new InvalidOperationException ("Service '"+ Description.ServiceType.Name + "' implements multiple ServiceContract types, and no endpoints are defined in the configuration file. WebServiceHost can set up default endpoints, but only if the service implements only a single ServiceContract. Either change the service to only implement a single ServiceContract, or else define endpoints for the service explicitly in the configuration file. When more than one contract is implemented, must add base address endpoint manually");
              var  enumerator = ImplementedContracts.Values.GetEnumerator ();
              enumerator.MoveNext ();
              Type contractType = enumerator.Current.ContractType;
              WebHttpBinding binding = new WebHttpBinding();
              binding.ReaderQuotas.MaxStringContentLength = Int32.MaxValue; //here also
          AddServiceEndpoint (contractType, binding, baseAddress);
            }

          }

          foreach (ServiceEndpoint se in Description.Endpoints)
            if (se.Behaviors.Find<WebHttpBehavior> () == null)
              se.Behaviors.Add (new WebHttpBehavior ());

          // disable help page.
          ServiceDebugBehavior serviceDebugBehavior = Description.Behaviors.Find<ServiceDebugBehavior> ();
          if (serviceDebugBehavior != null) {
            serviceDebugBehavior.HttpHelpPageEnabled = false;
            serviceDebugBehavior.HttpsHelpPageEnabled = false;
          }
        }
    }
}