Question

我是linq的新手并且很难用两个表实现搜索，我有一个正常工作的sql server存储过程，但是我想用linq做它并且它们看起来很不一样不能实现用户数和包含正确，任何人都可以帮助我这是我试图在linq中实现的我的SQL

 @pTeamName Varchar (25) = 'ALL',
 @pUserFirstName Varchar (25) = 'ALL'
    select 
        t.TeamId,TeamName,[Description],
        COUNT(u.UserId)as UserCount from Team t
  left outer join  [User] u on u.TeamId=t.TeamId
  WHERE
    (t.TeamName Like '%'+@pTeamName+'%' OR @pTeamName Like 'ALL')
  AND (u.FirstName = @pUserFirstName OR @pUserFirstName Like 'ALL')
  AND t.Deleted = 0
  group by 
  TeamName,
  [Description],
  t.TeamId

这是我到目前为止的linq

from t in Teams
join u in Users on t.TeamId equals u.TeamId
where t.TeamName.Contains("Tester")
select new {t.TeamName,t.Description,u.UserId}

Answer 1

你可以这样试试，

    var result = from t in Teams
    join u in Users on t.TeamId equals u.TeamId into j1
    where (t.TeamName.Contains("Tester") || t.TeamName.Contains("ALL") ) && (u.FirstName.Contains("username") || u.FirstName.Contains("ALL")) && t.Deleted = 0
    from j2 in j1.DefaultIfEmpty()
    Group j2 by new
     {
       t.TeamName,
       t.Description,
       t.TeamID,
      } into gcs
   select new {TeamName = gcs.key.TeamName,Description = gcs.Key.Description,Count = gcs.Count(x=>x.UserId)}

未经测试可能需要检查语法错误

使用linq搜索

1 个答案: