在C＃Entity-Framework中过滤对象模型的数据

Question

Assume A as object model that have property ID(int) and Status(Bool) and B as object model also have ID(int) and Status(Bool)

And I want get data from A filtered by it's property. if it an sql query like "select * from A where A.Status=True and A.ID in (Select ID from B Where B.Status=True) , I don't now how to make var C = that query..

var c = A.Where(a=>a.Status==True && a.ID .....) I don't know how to apply " in " here

I'm really new to use C# Entity Framework.

Answer 1

If A and B has some relationship and is represented by a navigation property named AB, then the query can be simple like this:

var c = A.Where(a=>a.Status && a.AB.Status);

If they don't have any relationship, then you can also query directly like this (although the performance won't be as good as the above):

var c = A.Where(a=>a.Status && B.Where(b=>b.Status).Any(b=>b.ID == a.ID))