C# 如何使用 EF 4.3 中的复杂键使用 AddOrUpdate 播种数据
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How to seed data with AddOrUpdate with a complex key in EF 4.3
提问by Keith Sirmons
I am trying to seed a development database with some test data.
我正在尝试使用一些测试数据为开发数据库提供种子。
I have used context.People.AddOrUpdate(p => p.Id, people));with much success.
我已经使用context.People.AddOrUpdate(p => p.Id, people));了很多成功。
I have another table that I need to seed, in which I would not know the primary key.
我有另一个需要播种的表，我不知道其中的主键。
For example, I would want to AddOrUpdate based on the First and Last names matching.
例如，我想根据名字和姓氏匹配来添加或更新。
I am unsure how to write the Expression correctly.
我不确定如何正确编写表达式。
context.People.AddOrUpdate(p => p.FirstName && p.LastName, people);
is obviously incorrect, but I hope it conveys the solution I am looking for.
显然不正确，但我希望它传达了我正在寻找的解决方案。
采纳答案by Ladislav Mrnka
Try this:
尝试这个：
context.People.AddOrUpdate(p => new { p.FirstName, p.LastName }, people);
回答by lukyer
If you got Only primitive types or enumeration types are supported in this context.because of using navigation property - consider adding foreign key property directly to the entity (maybe only with getter) and use it as Ladislav Mrnkaproposed.
如果您Only primitive types or enumeration types are supported in this context.因为使用导航属性而获得 - 考虑将外键属性直接添加到实体（可能仅使用 getter）并按照Ladislav Mrnka 的建议使用它。
