Returning an Object which inherits interface with a web service

[Mike9900]

I would like to return an object which inherits an interface. A web service
instantiate a class that inherits that interface and returns that object. But
I get error when referencing the web service from windows form. the error is:
"System.NotSupp ortedException: Cannot serialize interface
EmployeeCommon. IEmployee."

EmployeeCommon. IEmployee is an interface which is inerited by the
instantiated class. That class is instantiated and returned by the web
service called CompanySystem using a method called CreateEmployeeS ystem()
that returns IEmployee . IEmployee is inherited by the class Employee.

Here are the codes for what I am doing:

/*INTERFACE: this code is done in a common.dll project*/
public interface IEmployee
{
String GetName();
Int32 GetID();
}

/////There Codes are done in a web service project
/*CLASS EMPLOYEE TO INHERIT IEMPLOYEE*/
//I have removed System.Web.Serv ices.WebService
public class Employee :IEmployee
{
public Employee()
{}
.....implements all the interface methods
}
public class CompanySystem : System.Web.Serv ices.WebService
{
public CompanySystem()
{}
[WebMethod] //return I employee
public IEmployee CreateEmployeeS ystem()
{
return new Employee();//Employee is of type IEmployee
}
}

It compiless fine. But when referencing it in a Windows Form I get Error:
"Cannot serialize interface EmployeeCommon. IEmployee.".

The reason I do this is that I want a web service to return objects that
inherits an interface, so I can cast that object to an interface and use it
in the windows. I do this because I want it to be in synch with the Windows
implementation that is using IEmployee as well. So when I cast it, both of
the objects are of type IEmployee.

Is there a way to do this, please?
--
Regards,

Mike

[Chris Roden]

Does anyone have an answer for this? I am having the same problem.

"Mike9900" wrote:

I would like to return an object which inherits an interface. A web service
instantiate a class that inherits that interface and returns that object. But
I get error when referencing the web service from windows form. the error is:
"System.NotSupp ortedException: Cannot serialize interface
EmployeeCommon. IEmployee."

EmployeeCommon. IEmployee is an interface which is inerited by the
instantiated class. That class is instantiated and returned by the web
service called CompanySystem using a method called CreateEmployeeS ystem()
that returns IEmployee . IEmployee is inherited by the class Employee.

Here are the codes for what I am doing:

/*INTERFACE: this code is done in a common.dll project*/
public interface IEmployee
{
String GetName();
Int32 GetID();
}

/////There Codes are done in a web service project
/*CLASS EMPLOYEE TO INHERIT IEMPLOYEE*/
//I have removed System.Web.Serv ices.WebService
public class Employee :IEmployee
{
public Employee()
{}
....implements all the interface methods
}
public class CompanySystem : System.Web.Serv ices.WebService
{
public CompanySystem()
{}
[WebMethod] //return I employee
public IEmployee CreateEmployeeS ystem()
{
return new Employee();//Employee is of type IEmployee
}
}

It compiless fine. But when referencing it in a Windows Form I get Error:
"Cannot serialize interface EmployeeCommon. IEmployee.".

The reason I do this is that I want a web service to return objects that
inherits an interface, so I can cast that object to an interface and use it
in the windows. I do this because I want it to be in synch with the Windows
implementation that is using IEmployee as well. So when I cast it, both of
the objects are of type IEmployee.

Is there a way to do this, please?
--
Regards,

Mike