Can I get the parameters used in an expectation in Rhino Mocks?

Question

I am setting up an expectation for a call to a method that builds and executes a query. I would like to interrogate the properties of the parameter used. Is this possible

using (mocks.Record())
{
    Expect.Call(connection.Retrieve(SOMETHING_HERE)).Return(returnedDatay);
}

The bit I am after is the "SOMETHING HERE" bit.

(This is my first time using Rhino mocks)

Answer 1

You can set up constraints on your parameters and on the properties of the parameters. The following code sets up a constraint on a property named MyProperty on your connection object. The mock expects the MyProperty to be 42. Notice, that null is passed as the parameter since it is ignored.

Expect
    .Call(connection.Retrieve(null))
    .IgnoreArguments()
    .Constraints(Property.Value("MyProperty", 42))
    .Return(returnedData);

I am writing this from memory so it may not be absolutely correct.

---

UPDATE:

Rhino Mocks version 3.5 introduces a new extension method GetArgumentsForCallsMadeOn that lets you inspect the parameters passed to the mocked objects:

http://kashfarooq.wordpress.com/2009/01/10/rhino-mocks-and-getargumentsforcallsmadeon/