在您的 web.config(在 appSettings 部分)中添加:

Add this in your web.config (in the appSettings section):

<add key="enableSimpleMembership" value="false"/>
<add key="autoFormsAuthentication" value="false"/>

对于问为什么的人，这是 mvc 3 release 中描述的已知问题笔记更多详情这里

For the ones who ask why, it is a known issue described in the mvc 3 release notes More details here