对于WCF的几个问题

acqy 2008-10-30 10:24:12

我想请问几个WCF的问题：
1、如果Service部分没有暴露metadata endpoints，Client部分是否可以使用WsdlImporter以及ChannelFactory动态调用Service？比如，如果Client使用下面的代码去动态调用一个File Download Service，那么在Service部分是否需要暴露metadata endpoint？



        static void Main(string[] args)

        {

            EndpointAddress mexAddress = new EndpointAddress("http://localhost:8889/FileTransfer/mex");

            MetadataExchangeClient mexClient = new MetadataExchangeClient(mexAddress);

            MetadataSet metadataSet = mexClient.GetMetadata();

            WsdlImporter importer = new WsdlImporter(metadataSet);

            ServiceEndpointCollection endpoints = importer.ImportAllEndpoints();

            ChannelFactory<IFileDownloader> factory = new ChannelFactory<IFileDownloader>(

                   endpoints[0].Binding, endpoints[0].Address);

            IFileDownloader downloader = factory.CreateChannel();

            DownloadRequest request = new DownloadRequest("C:\\VIRTPART.DAT");

            DownloadResponse response = downloader.Download(request);

            Console.WriteLine(response.FileName);

            Console.WriteLine(response.Size);

        }

2、如果上面的回答是“必须暴露”，那么，如果我希望我的Service始终能够被动态调用，那暴露这个metadata endpoint是否会有安全威胁？如何解决这个矛盾？

3、Binding的设置问题。
比如，我的服务端是采用代码动态配置Service的，代码如下：



        static void Main(string[] args)

        {

            ContractDescription cd = ContractDescription.GetContract(typeof(IFileDownloader));

            BasicHttpBinding basicHttpBinding = new BasicHttpBinding();

            basicHttpBinding.MaxReceivedMessageSize = 10067108864;

            basicHttpBinding.TransferMode = TransferMode.Streamed;

            basicHttpBinding.MessageEncoding = WSMessageEncoding.Mtom;

            //WSHttpBinding basicHttpBinding = new WSHttpBinding();

            ServiceEndpoint endpoint = new ServiceEndpoint(

                cd,

                basicHttpBinding,

                new EndpointAddress("http://localhost:8889/FileTransfer/"));



            ContractDescription mexCd = ContractDescription.GetContract(typeof(IMetadataExchange));

            ServiceEndpoint mexEndpoint = new ServiceEndpoint(

                mexCd,

                MetadataExchangeBindings.CreateMexHttpBinding(),

                new EndpointAddress("http://localhost:8889/FileTransfer/mex"));





            System.ServiceModel.ServiceHost host = new System.ServiceModel.ServiceHost(typeof(FileTransferImpl));

            host.Opened += (a, b) => Console.WriteLine("Service Opened.");



            ServiceMetadataBehavior smb = new ServiceMetadataBehavior();

            smb.HttpGetEnabled = true;

            smb.HttpGetUrl = new Uri("http://localhost:8889/FileTransfer/mex");

            host.Description.Behaviors.Add(smb);

            host.AddServiceEndpoint(endpoint.Contract.ContractType, endpoint.Binding, endpoint.Address.ToString());

            host.AddServiceEndpoint(mexEndpoint.Contract.ContractType, mexEndpoint.Binding, mexEndpoint.Address.ToString());

            host.Open();

            foreach (ServiceEndpoint ep in host.Description.Endpoints)

            {

                Console.WriteLine(ep.Address.ToString());

            }

            Console.ReadLine();

        }

而客户端是用的第一个问题中的代码。其实事实上Service部分暴露了一个BasicHttpBinding的endpoint，并且设置了这个binding的MaxReceivedMessageSize以及TransferMode，但是我在Client端调试的时候，发现importer.ImportAllEndpoints调用所获得的binding虽然也是BasicHttpBinding，但是上述属性的设置值都遗失了（变成了默认值），这是什么原因呢？有没有办法解决？

希望高人出手相救！

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