在 SQL 中创建一个调用 WCF 服务器的 DLL 错误：找不到引用合同的默认端点元素

Question

I'm searching for a solution from 2 hours, so I give up and post here.

I have a C# 3.5 DLL created. It's goal it soooooo easy :

public static string CallWsMethodClient(string sXMLSettings, string sXMLIn)
    {
        try
        {
            WS_Generic.ServiceClient serv = new WS_Generic.ServiceClient();
            return serv.CallWsMethod(sXMLSettings, sXMLIn);
        }
        catch (Exception e)
        {
            XElement xRootNode = new XElement("ALL_XML_OUT");
            xRootNode.Add(new XElement("DLL_ERROR_MESS", e.GetType().Name + " - " + e.Message));
            xRootNode.Add(new XElement("DLL_ERROR_STACKTRACE", e.StackTrace));
            xRootNode.Add(new XElement("DLL_ERROR_INNER", e.InnerException));
            return xRootNode.ToString();
        }
    }

I have a service reference to a webservice (WS_Generic.ServiceClient).

My objective is to import this dll as assembly in SQL Server 2008R2, and call the method from SQL in order to call the web sevice.

I import the DLL with this command :

create assembly [blabla]

from 'xxxx\\blabla.dll' with permission_set = unsafe

I create the stored procedure with :

create function CallWsMethodClient(@sXMLSettings nvarchar(max), @sXMLIn nvarchar(max))
      returns nvarchar(max) external name blabla.[WCF_SQL.WcfClient].CallWsMethodClient

And when I execute my stored procedure... TADA !

<ALL_XML_OUT>
  <DLL_ERROR_MESS>InvalidOperationException - Could not find default endpoint element that references contract 'WS_Generic.IService' in the ServiceModel client configuration section. This might be because no configuration file was found for your application, or because no endpoint element matching this contract could be found in the client element.</DLL_ERROR_MESS>
  <DLL_ERROR_STACKTRACE>   at System.ServiceModel.Description.ConfigLoader.LoadChannelBehaviors(ServiceEndpoint serviceEndpoint, String configurationName)
   at System.ServiceModel.ChannelFactory.InitializeEndpoint(String configurationName, EndpointAddress address)
   at System.ServiceModel.ChannelFactory`1..ctor(String endpointConfigurationName, EndpointAddress remoteAddress)
   at System.ServiceModel.ChannelFactory`1..ctor(String endpointConfigurationName)
   at System.ServiceModel.EndpointTrait`1.CreateSimplexFactory()
   at System.ServiceModel.EndpointTrait`1.CreateChannelFactory()
   at System.ServiceModel.ClientBase`1.CreateChannelFactoryRef(EndpointTrait`1 endpointTrait)
   at System.ServiceModel.ClientBase`1.InitializeChannelFactoryRef()
   at System.ServiceModel.ClientBase`1..ctor()
   at WCF_SQL.WS_Generic.ServiceClient..ctor()
   at WCF_SQL.WcfClient.CallWsMethodClient(String sXMLSettings, String sXMLIn)</DLL_ERROR_STACKTRACE>
  <DLL_ERROR_INNER />
</ALL_XML_OUT>

I just want to die... Anybody have an idea ?

Of course, the config file of my dll is name_of_dll.dll.config.

May the dll is in memory, so I have to code in the dll my endpoint ? Bu the problem is I have to recompile it each time the url of web service change.

Thanks in advance

Answer 1

You are writing code that lives in a dB.

Why not pass in the endpoint URL as a parameter which is stored in the dB.

Answer 2

Ok so for the solution, I followed the way of Ben Robinson.

The target of this DLL will never change, or only few times.

So I put bindings in code :

        [...]    

        serv = new WS_Generic.ServiceClient(ConfigureBinding(), ConfigureEndPointAddress());

        [...]


        private static EndpointAddress ConfigureEndPointAddress()
        {
            EndpointAddress endpointAddress = new EndpointAddress("xxx");

            return endpointAddress;
        }

        private static BasicHttpBinding ConfigureBinding()
        {
            BasicHttpBinding binding = new BasicHttpBinding();

            binding.AllowCookies = false;
            binding.BypassProxyOnLocal = false;
            binding.CloseTimeout = TimeSpan.Parse("00:01:00");
            binding.HostNameComparisonMode = HostNameComparisonMode.StrongWildcard;
            binding.MaxBufferPoolSize = 524288;
            binding.MaxBufferSize = 5242880;
            binding.MaxReceivedMessageSize = 5242880;
            binding.MessageEncoding = WSMessageEncoding.Text;
            binding.Name = "BasicHttpBinding_IService";
            binding.OpenTimeout = TimeSpan.Parse("00:01:00");
            binding.ReceiveTimeout = TimeSpan.Parse("00:10:00");
            binding.SendTimeout = TimeSpan.Parse("00:01:00"); ;
            binding.TextEncoding = Encoding.UTF8;
            binding.TransferMode = TransferMode.Buffered;
            binding.UseDefaultWebProxy = true;

            return binding;
        }

And it works now ! Only one problem remains : I have to recompile the dll when I want to change the target !

Thanks for all your advice :)