EntityType 'BookInfo' has no key defined. Define the key for this EntityType

EntityType 'BookInfo' has no key defined. Define the key for this EntityType

建的模型需要有PK主关键字,默认为’Id’或者‘实体名Id'，如果PK不是这两个，要先添加[Key]到PK上方。

具体查看本博客文章：http://www.cnblogs.com/llk8/category/545808.html