Using Interface in a Webservice client

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Mike9900 - 30 Nov 2005 06:06 GMT

I want to use an interface in both the webservice and its client. For
example, the web service implements an interface and then the client cast
that webservice to the inteface. It seems impossible, but I am wondering if
there is a way.

The code below shows how I want it:

/*INTERFACE*/
public interface IEmployee
{
String GetName();
Int32 GetID();

}

/* WEBSERVICE*/
public class Employee : System.Web.Services.WebService,IEmployee
{
public Employee()
{

//Uncomment the following line if using designed components
//InitializeComponent();
}
[WebMethod]
public string GetName()
{
return "Ali";
}
[WebMethod]
public Int32 GetID()
{
return 2333;
}
}

/*Windows Client*/
//but this code is not casting, return null
public IEmployee GetEmployee()
{
//WSEmployee is the webservice reference
return new WSEmployee.Employee() as IEmployee;
}

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Mike

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DC - 30 Nov 2005 21:54 GMT

The cast in the client-side code does not work probably because the
webservice proxy does not actually implement IEmployee.

your code like this:

> public IEmployee GetEmployee()
> {
> //WSEmployee is the webservice reference
> return new WSEmployee.Employee() as IEmployee;
> }

...I am guessing WSEmployee.Employee is the client-side proxy class
generated by wsdl.exe ? Open the .cs file and examine it and you'll see
that you have something like this:

public class Employee : System.Web.Services.Protocols.SoapHttpClientProtocol
{
public String GetName(...) {...}
public Int32 GetId(...) {...}
}

you must modify the generated (client-side) class to specifically state that
it implements your IEmployee interface. like so:

public class Employee :
System.Web.Services.Protocols.SoapHttpClientProtocol, IEmployee {
....
}

Then compile your client and it should work.

-D

>I want to use an interface in both the webservice and its client. For
> example, the web service implements an interface and then the client cast
[quoted text clipped - 40 lines]
> return new WSEmployee.Employee() as IEmployee;
> }

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Using Interface in a Webservice client

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