Linq在（選擇...）語句中的列

Question

如何編寫與MS SQL中的此subselect等效的linq語句：

... WHERE
tblXref.Organization_Id IN (SELECT Organization_Id
                   FROM AppUser au INNER JOIN [User] u ON au.User_Id = u.Id
                   WHERE u.Username = usernameVariable)

Answer 1

好吧，單獨編寫內部查詢可能更簡單（請記住，您沒有在執行查詢）：

var innerQuery = from au in db.AppUsers
                 join u in db.Users on au.User_Id equals u.Id
                 where u.UserName == userNameVariable
                 select au.Organization_Id;

var query = from tblXref in db.CrossReferences // or whatever
            where innerQuery.Contains(tblXref.Organization_Id)
            ...;