Entity Framework 4.1 - Code First + WCF 서비스 시 EndpointNotFoundException 오류 - 두 번째 이야기

지난번에 이에 대한 해결책으로 "DbContext.Configuration.ProxyCreationEnabled" 속성을 false 값으로 설정하는 것으로 마무리 지었는데요.

Entity Framework 4.1 - Code First + WCF 서비스 시 EndpointNotFoundException 오류
; https://www.sysnet.pe.kr/2/0/1083

C:\Program Files (x86)\Microsoft ADO.NET Entity Framework 4.1\Binaries\EntityFramework.dll

===== MyEntity.cs =====

public class MyEntity
{
    [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
    public int Id { get; set; }
    public string Description { get; set; }

    public virtual ICollection<SubEntity> SubEntities { get; set; }
}

public class SubEntity
{
    [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
    public int Id { get; set; }
    public string Description { get; set; }

    public int MyEntityId { get; set; }
    public virtual MyEntity MyEntity { get; set; }
}

public class DBContext : DbContext
{
    public DBContext() { }

    public DBContext(string connectionString)
        : base(connectionString) { }

    public DbSet MyEntities { get; set; }
    public DbSet SubEntities { get; set; }
}

<connectionStrings>
    <add name="DBContext" providerName="System.Data.SqlClient"
        connectionString="Server=.;Database=EFTestDB;Trusted_Connection=true;"/>
</connectionStrings>

===== Service.svc =====

[ServiceContract()]
public interface IMyService
{
    [OperationContract]
    int CreateMyEntity(string description);

    [OperationContract]
    MyEntity[] GetMyEntities();
}

[ServiceBehavior]
public class MyService : IMyService
{
    public int CreateMyEntity(string description)
    {
        using (DBContext db = new DBContext())
        {
            MyEntity myEntity = new MyEntity();
            myEntity.Description = description;
            
            db.MyEntities.Add(myEntity);

            SubEntity subEntity1 = new SubEntity();
            subEntity1.Description = "SubEntity #1";
            subEntity1.MyEntity = myEntity;

            SubEntity subEntity2 = new SubEntity();
            subEntity2.Description = "SubEntity #2";
            subEntity2.MyEntity = myEntity;

            db.SubEntities.Add(subEntity1);
            db.SubEntities.Add(subEntity2);

            db.SaveChanges();

            return myEntity.Id;
        }
    }

    public MyEntity [] GetMyEntities()
    {
        using (DBContext db = new DBContext())
        {
            var items = from record in db.MyEntities
                        select record;

            return items.ToArray();
        }
    }
}

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

class Program
{
    static void Main(string[] args)
    {
        using (ServiceReference1.MyServiceClient svc = new ServiceReference1.MyServiceClient())
        {
            Console.WriteLine(svc.CreateMyEntity("World!"));

            foreach (var item in svc.GetMyEntities())
            {
                Console.WriteLine(item.Description);
            }
        }
    }
}

Demystifying Entity Framework Strategies, Part 3: Classes, Queries and Contexts
; https://docs.microsoft.com/en-us/archive/msdn-magazine/2011/july/msdn-magazine-data-points-demystifying-entity-framework-strategies-part-3-classes-queries-and-contexts

public class MyEntity
{
    [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
    public int Id { get; set; }
    public string Description { get; set; }

    public /* virtual */ ICollection<SubEntity> SubEntities { get; set; }
}

public class SubEntity
{
    [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
    public int Id { get; set; }
    public string Description { get; set; }

    public int MyEntityId { get; set; }
    public /* virtual */ MyEntity MyEntity { get; set; }
}

Unhandled Exception: System.ServiceModel.FaultException`1[System.ServiceModel.ExceptionDetail]: The provider did not return a ProviderManifestToken string.

Server stack trace:
   at System.ServiceModel.Channels.ServiceChannel.ThrowIfFaultUnderstood(Message reply, MessageFault fault, String action, MessageVersion version, FaultConverter faultConverter)
   at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]:
    ...[생략]...

Unhandled Exception: System.ServiceModel.FaultException`1[System.ServiceModel.ExceptionDetail]: An error occurred while updating the entries. See the inner exception for details.

Server stack trace:
   at System.ServiceModel.Channels.ServiceChannel.ThrowIfFaultUnderstood(Message reply, MessageFault fault, String action, MessageVersion version, FaultConverter faultConverter)
   at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]:
    ...[생략]...