实体框架查询嵌套查询

Question

I am new to the entity framework and am trying to convert the following query into the correct function calls.

Select Distinct a.nodeId FROM 
    (SELECT *
    FROM reportContents
    Where fitId = '29' and reportId = 
       (select max(reportId) 
       from reportContents
       where fitId = '29')
     ) a Where (a.nodeId IS NOT NULL)

I know this query does what i want, however i'm not sure how to translate that into the entitiy framework!

Here was my attempt.

var prevSelectedNodes = db.reportContents.Where(
f => f.fitId == id).Select(
f => f.nodeId).Distinct().ToList();

I need to somehow put a .Select() in the where call. However that kind of thing dosen't seem possible

Thank you in advance!

Answer 1

As you can't make two LINQ nested lambda expression. You can do it with two requests :

var maxReportId = db.reportContents.Where(r => r.fitId = "29").Max(r => r.RepordId);
var result = db.reportContents.Where(r => r.fitId == "29" && r.reportId == maxReportId && r.nodeId != null).Select(a => a.nodeId).Distinct().ToList() ;