我正在将旧代码转换为使用 LINQ。旧代码如下所示:
// Get Courses
sqlQuery = @"SELECT Comment.Comment, Status.StatusId, Comment.DiscussionBoardId, DiscussionBoard.CourseId, Comment.CommentID
FROM Status INNER JOIN Comment ON Status.StatusId = Comment.StatusId INNER JOIN
DiscussionBoard ON Comment.DiscussionBoardId = DiscussionBoard.DiscussionBoardId
WHERE (DiscussionBoard.CourseID = 'CourseID')";
var comments = new List<Comment>(dataContext.ExecuteQuery<Comment>(sqlQuery));
我已将上述 SQL 转换为 LINQ:
var db = new CMSDataContext();
var query = from c in db.Comments
join s in db.Status on c.StatusId equals s.StatusId
join d in db.DiscussionBoards on c.DiscussionBoardId equals d.DiscussionBoardId
where d.CourseId == "CourseID"
select new
{
d.ItemType,
c.Comment1,
s.Status1,
c.DiscussionBoardId,
d.CourseId,
c.CommentID
};
不过,我遇到的问题是尝试将查询结果放入列表中。有人可以给我一些指示吗?
谢谢!