LINQ LEFT JOIN where子句不起作用

我需要返回所有事件的列表以及用户可能拥有的任何事件的rsvps。 但是，无论我传递的用户名是什么，它都会返回每个rsvp。 我的linq查询 – >

return (from events in this._context.Context.Events join rsvps in (this._context.Context.RSVPs .Where(o=> o.UserName == userName)) on events equals rsvps.Event into re from rsvps in re.DefaultIfEmpty() select events); 

关系是
Events.EventID = RSVPs.EventID

Answer 1

 from e in _context.Context.Events join r in _context.Context.RSVPs.Where(o => o.UserName == userName) on e.EventID equals r.EventID into g select new { Event = e, Rsvps = g }; 

Answer 2

这样做：

 return (from events in this._context.Context.Events join rsvps in this._context.Context.RSVPs on events.EventIDequals equals rsvps.EventID into re from c in re.DefaultIfEmpty() where c.UserName == userName select new {events,rsvps}); 

Answer 3

如果你只想过滤你的事件的RSVPs属性，那么我猜你可能会使用类似的东西

 var events = _context.Context.Events; foreach(var event in events) { // Assuming the property is named RSVPs event.RSVPs = event.RSVPs.Where(o => o.UserName.Equals(userName)); } return events; 

我不会认为这很整洁。