Sort a Linq query
Experts, I am trying to figure out how to order this query Descending. Please help...
Dim query = From company In dt.AsEnumerable
Select company.Field(Of String)("Company")
DistinctASKER CERTIFIED SOLUTION
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Hi Basicfarmer;
The Distinct method call returns an unordered collection and so if you attempted to do it before the Distinct call it would not work. You need to do the ordering after the call to Distinct as shown below.
The Distinct method call returns an unordered collection and so if you attempted to do it before the Distinct call it would not work. You need to do the ordering after the call to Distinct as shown below.
Dim query = (From company In dt.AsEnumerable
Select company.Field(Of String)("Company")
Distinct).OrderByDescending(Function(c) c) ASKER
Fernando, thanks for the comment.
Hi Basicfarmer;
Not a problem. My statement about ordering came from Microsoft documentation [here] and full statement below.
Not a problem. My statement about ordering came from Microsoft documentation [here] and full statement below.
The Distinct(Of TSource)(IEnumerable(Of TSource)) method returns an unordered sequence that contains no duplicate values. It uses the default equality comparer, Default, to compare values.
@Fernando
That's for Distinct itself, though. If you're already dealing with an ordered collection, I doubt that Distinct is going to re-order the distinct result differently than the ordered source. I'd have to test it, though. If anything, what I am suggesting would be an implementation detail, and the most guaranteed way to ensure an ordered result would be to order after the Distinct, as you mentioned.
That's for Distinct itself, though. If you're already dealing with an ordered collection, I doubt that Distinct is going to re-order the distinct result differently than the ordered source. I'd have to test it, though. If anything, what I am suggesting would be an implementation detail, and the most guaranteed way to ensure an ordered result would be to order after the Distinct, as you mentioned.
ASKER