asp.net MVC 3 url设置问题

Question

请教一个问题哈，我的url是类似于http://localhost/{username}/{controler}/{action}，username是个参数，如何做到每次ActionLink("action","controller")自动等于http://localhost/{username(它等于=httpcontext.user.identify.name)}/controller/action呢？大虾请赐教！