没有配置的自托管 WCF - 很难理解设置端点

Question

我已经研究了一天，在这里向各位专家寻求建议。

我有 REST 服务，它是主要的 IIS 托管服务。

此服务需要与 32 位非托管 .dll 接口。为了做到这一点，我采用了一种常见的方法，即创建一个自托管服务并对其进行调用。

在这样的背景下，我有一段时间让自托管的主机正常工作。

这是有效的代码：

static void Main(string[] args)
        {
            Uri baseAddress = new Uri("http://localhost:8080/theSvc");
            Uri mexUri = new Uri("http://localhost:8080/theSvc/mex");

            // Create the ServiceHost.
            using (ServiceHost host = new ServiceHost(typeof(ImgService), baseAddress))
            {
//                var wsHttpBinding = new WSHttpBinding();
  //              wsHttpBinding.MaxReceivedMessageSize = int.MaxValue;
    //            host.AddServiceEndpoint(typeof(IImgService), wsHttpBinding, baseAddress);

                // Enable metadata publishing.
                ServiceMetadataBehavior smb = new ServiceMetadataBehavior();
                smb.HttpGetUrl = mexUri;
                smb.HttpGetEnabled = true;
                smb.MetadataExporter.PolicyVersion = PolicyVersion.Policy15;
                host.Description.Behaviors.Add(smb);



                // Open the ServiceHost to start listening for messages. Since
                // no endpoints are explicitly configured, the runtime will create
                // one endpoint per base address for each service contract implemented
                // by the service.
                host.Open();

                Console.WriteLine("The service is ready at {0}", baseAddress);
                Console.WriteLine("Press <Enter> to stop the service.");
                Console.ReadLine();

                // Close the ServiceHost.
                host.Close();
            }
        }
    }

现在...如果我取消注释这些行以增加 maxreceivedMessageSize 并从 using 语句中删除 baseAddress，我将无法再添加对服务的引用：

所以改变这个：

        using (ServiceHost host = new ServiceHost(typeof(ImgService), baseAddress))

到这里：

        using (ServiceHost host = new ServiceHost(typeof(ImgService)))

并取消注释：

//                var wsHttpBinding = new WSHttpBinding();
  //              wsHttpBinding.MaxReceivedMessageSize = int.MaxValue;
    //            host.AddServiceEndpoint(typeof(IImgService), wsHttpBinding, baseAddress);

我收到的错误是：

... -> 本地主机

There was an error downloading 'http://...:8080/theSvc/_vti_bin/ListData.svc/$metadata'.
The request failed with HTTP status 400: Bad Request.
Metadata contains a reference that cannot be resolved: 'http://...:8080/theSvc'.
Metadata contains a reference that cannot be resolved: 'http://...:8080/theSvc'.
If the service is defined in the current solution, try building the solution and adding the service reference again.

就像其他在这里发帖的人一样……我陷入了困境。非常感谢任何帮助。

Answer 1

您似乎没有添加服务端点。

这是我用来启动 http 主机的功能，但是我将它托管在 Windows 服务中。这与您的控制台应用程序相同。但 IIS 的想法可能会有所不同。

static Uri scannerSvcBaseAddress;
static BasicHttpBinding scannerBinding;
static ServiceHost scannerHost;

public void startScannerWcfService(long eventID)
{
    try
    {
        db.writeServiceLog(eventID, "STARTUP", "=== Scanner WCF Service Starting ===");

        string addressToHostAt = ConfigurationManager.AppSettings["ScannerHostBaseAddress"];

        if (addressToHostAt != null && addressToHostAt.Trim() != string.Empty)
        {

            scannerSvcBaseAddress = new Uri(addressToHostAt);
            scannerHost = new ServiceHost(typeof(BarCodeService.ScannerService), scannerSvcBaseAddress);

            //Allows publishing of METADATA to developers when self hosted on a remote system                 
            ServiceMetadataBehavior smb = scannerHost.Description.Behaviors.Find<ServiceMetadataBehavior>();
            if (smb == null)
            {
                smb = new ServiceMetadataBehavior();
            }
            smb.HttpGetEnabled = true;
            smb.MetadataExporter.PolicyVersion = PolicyVersion.Policy15;
            scannerHost.Description.Behaviors.Add(smb);

            scannerHost.AddServiceEndpoint(ServiceMetadataBehavior.MexContractName, MetadataExchangeBindings.CreateMexHttpBinding(), "mex");

            scannerBinding = new BasicHttpBinding();
            scannerBinding.MaxReceivedMessageSize = 2147483647;
            scannerBinding.Security.Mode = BasicHttpSecurityMode.None;
            scannerBinding.OpenTimeout = new TimeSpan(0, 0, 10);
            scannerBinding.CloseTimeout = new TimeSpan(0, 0, 10);
            scannerBinding.SendTimeout = new TimeSpan(0, 5, 0);
            scannerBinding.ReceiveTimeout = new TimeSpan(0, Global.scanUserIdleLogout * 2, 0);

            //scannerBinding.ReliableSession.InactivityTimeout = new TimeSpan(2, 0, 0, 0);

            scannerHost.AddServiceEndpoint(typeof(BarCodeService.IScannerService), scannerBinding, "");

            var behavior = scannerHost.Description.Behaviors.Find<ServiceDebugBehavior>();
            behavior.IncludeExceptionDetailInFaults = true;


            scannerHost.Open();

            db.writeServiceLog(eventID, "STARTUP", "=== Scanner WCF Service Started ===");
        }
        else
            throw new Exception("Host Base Address not provided");
    }
    catch (Exception ex)
    {
        db.writeServiceLog(eventID, "STARTUP", string.Format("Error in ServiceManager.startScannerWcfService: {0} {1}", ex.Message, ex.StackTrace));
        throw;
    }

}

如上所述，如果您只需要公开一个字符串 WCF 可能是矫枉过正。我在 Windows 服务中使用 WCF 连接到仓库环境中的手持扫描仪，我对它的性能非常满意。虽然最初让它工作是一个巨大的痛苦。

但是由于这个问题是在 WCF 的上下文中提出的，我想我会用一个已知的工作函数来回答，它基本上可以做你想做的事情。