问题描述
我正在使用Entity Framework 4和数据库优先绑定，而EF不会为我的几个表生成实体。我没有得到任何错误，无论从设计表面上的从数据库更新模型弹出菜单中选择要生成的表，我们仍然缺少相同的表。
I'm using Entity Framework 4 and with a Database First binding, and EF is not generating the entities for a few of my tables. I'm not getting any errors, and no matter how many times I select the tables to generate from the "Update Model from Database" popup menu on the design surface, the same tables are still missing from the model.
在向导中没有错误。他们只是不生成。任何线索？
I get no errors in the wizard. They just don't get generated. Any clues?
推荐答案
EF需要表上的主键。 EF不会映射找不到或派生主键的表。如果所有列都为空，则不能使用主键。如果一个或多个列不可为空，则EF将明显地导出该表的主键。
EF requires a primary key on the table. EF will not map tables for which it can't find or derive a primary key. If all columns are nullable, it can't assume a primary key. If one or more columns are not nullable, EF will evidently derive a primary key for the table.
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