CODEWITHSUNDEEP
wcf
Elz
Elz

Reputation: 907

Passing callback objects to WCF service methods

Is it possible to pass callback objects (with callback methods) to a wcf service method?

Let's presume i have the following class:

class Callback
{
     public Callback(){}
     public int GetSomeData(int param)
     {
       return param;
     }
}

Is it possible somehow to make a call like :

WCFServiceProxy proxy = new WCFServiceProxy();
Callback myCallback = new Callback();
proxy.SomeMethod(myCallback);

and have the service call GetSomeData() implemented on the client side? Or what would be a working solution for this?

Upvotes: 1

Views: 1712

Answers (2)

Matt Davis
Matt Davis

Reputation: 46052

Yes, you can do that. You have to define a secondary interface that serves as the callback contract.

[ServiceContract]
public interface ICallback
{
    [OperationContract(IsOneWay=true)]
    void InvokeCallback();
}

[ServiceContract(CallbackContract=typeof(ICallback)]
public interface IContract
{
    [OperationContract]
    void DoSomething();
}
[ServiceBehavior]
public class MyService : IContract
{
    void DoSomething() { }
}

That's the basic approach. I would strongly suggestion looking at Juval Lowy's website, IDesign.net. His downloads section has several examples of how to do this.

Upvotes: 0

Arsen Mkrtchyan
Arsen Mkrtchyan

Reputation: 50752

see Duplex Services

Upvotes: 1

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