Service which provides interface-impelementation instead of data - web-services

Question

Since a while now I'm implementing services whenever possible with ServiceStack (or WebAPI) instead of WCF.
What I want to do now is sending an interface (-name) to the server and get a class-implementation back. Maybe that's confusing, so I'll give you an example:
My service-client has multiple operations - like "check form":
The logic for checking this form is not implemented. What it has is an interface called IFormChecker with methods like NameIsValid(string firstName, string middleName, string lastName).
Instead of sending the whole form-data to the server for validation, the client will request the implementation of IFormChecker from the server.
I know that's possible with WCF, but I have no idea how to do that with ServiceStack.
If that's possible, what's the way to go? I checked the documentation, but I'm not really wiser.

Answer 1

It seams like there's no "magic trick" or anything.
I have to serialize/deserialize the class "old-fashion way".
If you're interested, here's the solution:
I created a "Root"-Interface, in this example it is IModule.
This IModule contains only 1 property, called Name.
It is a string and only there for convenience:
The IFormChecker from the example would be derived from this interface:
My client knows the value of this Name-property and of course the interface itself.
It will now fire the Name-value to the server, which will return the serialized class.
All I have to do is:
var module = ModuleImplementations.FirstOrDefault(x => x.Name == name);
if(module == null) throw new SomeException();
return module.Serialize();
client-wise I can deserialize it and cast it to the interface. That's it.
Here's my ModuleSerialization-Class:
public static class ModuleSerialization
{
public static string Serialize(this IModule m)
{
using (var ms = new MemoryStream())
{
var bf = new BinaryFormatter();
bf.Serialize(ms, m);
return Convert.ToBase64String(ms.ToArray());
}
}
public static T Deserialize<T>(string serialized) where T : class, IModule
{
var ba = Convert.FromBase64String(serialized);
using (var s = new MemoryStream(ba))
{
var bf = new BinaryFormatter();
return bf.Deserialize(s) as T;
}
}
}
Cheers!