linq-to-sql orderby 和 select null 条目

Question

I have a query that looks like this:

var TheOutput = from u in MyDC.TheTable
                where ....
                orderby u.TheDateTimeUsed
                select new MyModel()
                {
                   ....
                   TheDateCreated = u.TheDateTimeCreated,
                   TheDateUsed = u.TheDateTimeUsed
                   ...

                };

return TheOutput.Take(10).ToList();

u.DateTimeUsed is a nullable date. If the value is null, then I want these records to appear first in the list of 10 that I'm loading.

How can I do this?

Thanks.

Answer 1

Maybe something like this:

var TheOutput = from u in MyDC.TheTable
                where ....
                orderby !u.TheDateTimeUsed.HasValue
                orderby u.TheDateTimeUsed
                select new MyModel()
                {
                   ....
                   TheDateCreated = u.TheDateTimeCreated,
                   TheDateUsed = u.TheDateTimeUsed
                   ...

                };

You can also do it like this:

var TheOutput = from u in MyDC.TheTable
                where ....
                orderby u.TheDateTimeUsed??DateTime.MinValue
                select new MyModel()
                {
                   ....
                   TheDateCreated = u.TheDateTimeCreated,
                   TheDateUsed = u.TheDateTimeUsed
                   ...

                };

Not as nice as the first one.