通过最后一个查询

Question

选择多个结果与LINQ多个字段我需要查询的LINQ一个表，并结合行从LINQ查询返回一个对象

WebChatDBDataContext dataContext = new WebChatDBDataContext(); 
var executiveSession= dataContext.ExecutiveSessions.FirstOrDefault(s => s.SessionId == httpcontext.Session.SessionID); 
var talkerId = (from cRoom in dataContext.ChatRooms 
       where cRoom.ExecutiveId == executiveSession.ExecutiveSessionId 
       select cRoom.TalkerId 
       ); 
var msglst = from msgPool in dataContext.MessagePools 
      // I want to use talkerId from the previous query 
      where msgPool.TalkerId == ??? 
      select msglst; 

感谢名单

Answer 1

这听起来像你想要加入。如果你不需要talkerId为别的，这将是最简单的做到这一点在单个查询：

var executiveSessionId = dataContext.ExecutiveSessions 
     .FirstOrDefault(s => s.SessionId == httpcontext.Session.SessionID) 
     .ExecutiveSessionId; 

var pools = from room in dataContext.Rooms 
      where room.ExecutiveId == executiveSessionId 
      join pool in dataContext.MessagePools 
       on room.TalkerId equals pool.TalkerId 
      select pool;