如何使用LINQ to Entity中的包含功能

Question

I have this query :

int[] listId = {15, 56, 89, 24}
var queryError = from error in db.errors
                 where listId.Contains(error.battery_id)                                    
                 select error;

 List<error> bufferErrorList = new List<error>();
 bufferErrorList = queryError.ToList();

But i get the error message :

LINQ to Entities dont recognise the method « Boolean Contains(System.Object) », so it cannot be translated.

How can I get my results ?

Thanks !

Answer 1

您是否尝试过将对象转换为int类型？

where listId.Contains((int)error.battery_id)  

Answer 2

It has already been asked here

Try something like this:

int[] listId = {15, 56, 89, 24}
var queryError = from error in db.errors
                 where listId.Any(x => x == error.battery_id)                                    
                 select error;

 List<error> bufferErrorList = new List<error>();
 bufferErrorList = queryError.ToList();