How to convert this one to LINQ?
select d.UserID, d.Content, d.UpdateTime
from DiaryPosts as d
where d.UserID = 1
/* Friends posts */
Union
select d.UserID, d.Co
There is a Union Method in LINQ
Here is a hint. When things get difficult break them down, then simplify. I will help you break down the problem and leave the simplification to you.
var query1 = (from d in db.DiaryPosts
where d.UserID = 1
select new {
UserID = d.UserID
Content = d.Content
UpdateTime = d.UpdateTime
}).ToList();
var query2 = (from d in db.DiaryPosts
join f in db.Friends
on d.UserId = f.FriendId
where f.UserId = 1
select new {
UserID = d.UserID
Content = d.Content
UpdateTime = d.UpdateTime
}).ToList();
var query3 = (from d in db.DiaryPosts
join f in db.Followers
on d.UserId = f.FollowerID
where f.UserId = 1
select new {
UserID = d.UserID
Content = d.Content
UpdateTime = d.UpdateTime
}).ToList();
var myunionQuery = query1.Union(query2).Union(query3).OrderBy(d => d.UpdateTime);