如何使用左连接，聚合和where子句创建Linq to Sql

Question

有谁知道如何将此查询转换为LINQ to SQL？

SELECT posts.*, count(COMMENTS.*) AS comment_count FROM POSTS 
LEFT JOIN COMMENTS on POSTS.id = COMMENTS.post_id 
WHERE comments.date IS NULL OR comments.date >= [NOW] 
GROUP BY posts.id 
ORDER BY comment_count DESC 

它在SQL中很简单，但是我在将linq转换为sql时遇到了困难。任何帮助，将不胜感激！

感谢

Answer 1

只是一个建议，你可以随时使用这个伟大的工具

http://www.sqltolinq.com/

，以帮助转换

Answer 2

你想是这样的：

var query = 
    from p in POSTS 
    join c in COMMENTS on p.id equals c.post_id into cs 
    group new 
    { 
     Post = p, 
     Comments = cs 
      .Where(c1 => c1.date >= DateTime.Now) 
      .Count(), 
    } by p.id;