How do I add IOperationInvoker to wcf client

Question

I want to add my own IOperationInvoker to a wcf client but can't get it to work. I have this

class ClientProgram
{
    static void Main()
    {
        CreateClient().SomeMethod();
    }

    private static MyServiceClient CreateClient()
    {
        var client = new MyServiceClient(new NetTcpBinding(), new EndpointAddress"net.tcp://localhost:12345/MyService"));
        // I guess this is where the magic should happen
        return client;
    }
}

public class MyOperationInvoker : IOperationInvoker
{
    private readonly IOperationInvoker _innerOperationInvoker;

    public MyOperationInvoker(IOperationInvoker innerOperationInvoker)
    {
        _innerOperationInvoker = innerOperationInvoker;
    }

    public object Invoke(object instance, object[] inputs, out object[] outputs)
    {
        Console.WriteLine("Intercepting...");
        return _innerOperationInvoker.Invoke(instance, inputs, out outputs);
    }

    // Other methods not important
}

Answer 1

You must have something mixed up here.

The IOperationInvoker is a server-side only extension point. It allows you to inspect an incoming message and invoke a particular operation on the service based on that message (its content, headers - whatever).

On the client side, this doesn't make sense at all - there's no way a client can use a IOperationInvoker implementation.

If you want to know how to add an IOperationInvoker implementation on the server-side, check out this blog post for a complete run-down.

For an excellent general-purpose introduction to WCF extensibility, check out Aaron Skonnards MSDN article here .

Marc

Answer 2

听起来你可能会更好地实现IClientMessageInspector扩展。

Answer 3

You have missed IOperationBehavior

public class MyOperationBehavior : IOperationBehavior
{
    public void ApplyDispatchBehavior(OperationDescription operationDescription, DispatchOperation dispatchOperation)
    {
        dispatchOperation.Invoker = new MyOperationInvoker();
    }
}