The underlying connection was closed in WCF with Serializers - wcf

Question

I have a WCF service with a service interface
[ServiceContract]
public interface IMyService
{
[OperationContract]
[ServiceKnownType(typeof(Person))]
[ServiceKnownType(typeof(Employee))]
IPerson GetPerson();
}
and my Implementation of GetPerson is
public IPerson GetPerson()
{
IPerson obj = new Person();
obj.FirstName = "Bhuvan";
obj.LastName = "Ram";
return obj;
}
And in my client as simple I used
KnownType.MyServiceClient obj = new KnownType.MyServiceClient();
Person objp = (Person)obj.GetPerson()'
But when I am trying to access, I am receiving an error
The underlying connection was closed: The connection was closed unexpectedly.
and my stack trace is like this
at System.Net.HttpWebRequest.GetResponse()
at System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
at System.Net.HttpWebRequest.GetResponse()
at System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)..
My Employee Class is
>
[DataContract(Name = "Employee")]
[KnownType(typeof(IEmployee))]
public class Employee:IEmployee
{
[DataMember]
public string EmployeeName
{
get;set;
}
}
>
My Person Class is
[DataContract(Name = "Person")]
[KnownType(typeof(IPerson))]
public class Person: IPerson
{
#region IPerson Members
[DataMember(Name = "FirstName")]
public string FirstName { get; set; }
[DataMember(Name = "LastName")]
public string LastName { get; set; }
#endregion
}
How do I resolve this?

Answer 1

There might be a serialization issue on Concrete class Person.
[ServiceContract]
public interface IMyService
{
[OperationContract]
IPerson GetPerson();
}
public interface IPerson
{
string FirstName { get; set; }
string LastName { get; set; }
}
[DataContract(Name = "Person")]
[KnownType(typeof(IPerson))]
public class Person : IPerson
{
[DataMember(Name = "FirstName")]
public string FirstName { get; set; }
[DataMember(Name = "LastName")]
public string LastName { get; set; }
}
Can use ServiceKnownType attribute on the method signature, rather than using the KnownType attribute on the whole class
[OperationContract]
[ServiceKnownType(typeof(Person))]
IPerson GetPerson();
Source: Check this link for detail
Ref : Using Knowntype
Note:
Use Knowntype everywhere or ServiceKnowntype on ServiceContract only.
Try with unique namespace to DataContract of Person and Employee classes.