EF 4.0 LINQ到Enity查詢

Question

傢伙嗨，我需要在這個Linq的SQL查詢複製到實體

select * from Subscriber a 
    inner join User b on a.UserId = b.Id 

    where b.Username = 'Name' 

可能有人可能會有幫助。

Answer 1

試試這個：

var query = from s in context.Subscribers.Include("User") 
      where s.User.Username == "Name" 
      select s; 

這個假設Subscriber具有參考用戶實例導航屬性User。

如果婉使用連接（這是不需要的），你可以用這個內部聯接：

var query = from s in context.Subscribers 
      join u in context.Users on s.User.Id equals u.Id 
      where u.Username == "Name" 
      select new 
       { 
        Subscriber = s, 
        User = u 
       }; 

或這個左外連接：

var query = from s in context.Subscribers 
      join u in context.Users on s.User.Id equals u.Id into x 
      where u.Username == "Name" 
      from y in x.DefaultIfEmpty() 
      select new 
       { 
        Subscriber = s 
        User = y, 
       };