Rhino Mocks：如何从模拟对象方法返回条件结果

Question

I would like to do something like the following but can't seem to get the syntax for the Do method quite right.

var sqr = new _mocks.CreateRenderer<ShapeRenderer>();
Expect.Call(sqr.CanRender(null)).IgnoreArguments().Do(x =>x.GetType() == typeof(Square)).Repeat.Any();

So basically, I would like to set up the sqr.CanRender() method to return true if the input is of type Square and false otherwise.

Answer 1

Are you looking for this?

Expect.Call(sqr.CanRender(null)).IgnoreArguments()
    .Do((Func<Shape, bool>) delegate(Agent x){return x.GetType() == typeof(Square);})
    .Repeat.Any();

EDIT: The answer was correct in spirit bu the original syntax did not quite work.

Answer 2

If you aren't able to use .Net Framework 3.5 (required by Cristian's answer ) and therefore don't have access to the System.Func delegates then you'll need to define your own delegate.

Add to the class member:

private delegate bool CanRenderDelegate(Shape shape)

The expectation becomes:

Expect.Call(sqr.CanRender(null))
    .IgnoreArguments()
    .Do((CanRenderDelegate) delegate(Agent x){return x.GetType() == typeof(Square);})
    .Repeat.Any();

Answer 3

As of Rhino Mocks 3.5 you can now do the following:

Expect.Call( sqr.CanRender( Arg<Shape>.Is.TypeOf<Square>() ).Repeat.Any();

Look at this wiki article for more information.