LINQ排序匿名类型？

在linq to sql中生成匿名类型时如何进行排序？

例如:

from e in linq0
order by User descending /* ??? */
select new
{
   Id = e.Id,
   CommentText = e.CommentText,
   UserId = e.UserId,
   User = (e.User.FirstName + " " + e.User.LastName).Trim()),
   Date = string.Format("{0:d}", e.Date)
}

Jon Skeet.. 20

如果你正在使用LINQ to Objects,我会这样做:

var query = from e in linq0
            select new
            {
                Id = e.Id,
                CommentText = e.CommentText,
                UserId = e.UserId,
                User = (e.User.FirstName + " " + e.User.LastName).Trim()),
                Date = e.Date.ToString("d")
            } into anon
            orderby anon.User descending
            select anon;

这样,字符串连接只需要完成一次.

我不知道在LINQ to SQL中会做什么......

如果你正在使用LINQ to Objects,我会这样做:

var query = from e in linq0
            select new
            {
                Id = e.Id,
                CommentText = e.CommentText,
                UserId = e.UserId,
                User = (e.User.FirstName + " " + e.User.LastName).Trim()),
                Date = e.Date.ToString("d")
            } into anon
            orderby anon.User descending
            select anon;

这样,字符串连接只需要完成一次.

我不知道在LINQ to SQL中会做什么......

如果我已正确理解您的问题,您希望这样做:

from e in linq0
order by (e.User.FirstName + " " + e.User.LastName).Trim()) descending 
select new
{
   Id = e.Id,
   CommentText = e.CommentText,
   UserId = e.UserId,
   User = (e.User.FirstName + " " + e.User.LastName).Trim()),
   Date = string.Format("{0:d}", e.Date)
}