C# A question about the lambda expression as a method parameter

At the page code.google.com/p/fakeiteasy/ I've noticed the line:

A.CallTo(() => shop.GetTopSellingCandy()).Returns(lollipop开发者_StackOverflow);

so the question is - how to pass a lambda expression as a method parameter ?

---

This function takes a parameter of type Func<T> (A normal delegate with a generic parameter), or, more likely, Expression<Func<T>> (an expression tree).

The function itself probably has a generic parameter which is inferred from the method passed.

By taking an expression tree, the function is able to inspect the code inside the expression and see what it does.

---

The code you've given is doing exactly that - passing a lambda expression as a paramter to a method call.

---

CallTo might have the signature 'CallTo(Action action)'. So lambda is passed as a delegate