In step 7 of the ASP.MVC 3 Tutorial, it introduces the 'ModelBuilder' type. I'm using ASP.Net 4, MVC 3, and EF 4.1, and I get the red squiggly lines under the 'ModelBuilder' type. It can't find the type. Has that type name changed? What reference should I add to use it?, it introdu
阅读背景：
无法找到'ModelBuilder'的类型或命名空间（您是否缺少using指令或程序集引用？）
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