的LINQ的列（SELECT ...）聲明

Question

怎麼寫纔會這樣子選擇在MS SQL相當於一個LINQ聲明：

... 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

嗯，這可能是簡單的單獨編寫內部查詢（記住，你不是執行查詢）：

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) 
      ...;