feat(Sorting): enable pre sorting in resolver

[PascalSenn]

Queryables can now be pre sorted in the resolver

[PascalSenn]

I'll check

[PascalSenn]

@michaelstaib IOrderedQueryable behaves not as one might expect.

IQueryable<Foo> t = new Foo []{}.AsQueryable();
t is IOrderedQueryable<Foo>// true
typeof(IOrderedQueryable<Foo>).IsAssignableFrom(t.GetType()) // true

The Problem

https://stackoverflow.com/questions/5071426/how-can-i-tell-if-an-iqueryable-is-an-iorderedqueryable/22012961

The problem with Entity Framework is that EF DbSet inherits from DbQuery which itself implements IOrderedQueryable! So your statement always returns true if myQueryable is an EF query but not sorted at all.

https://stackoverflow.com/questions/8507746/determine-whether-an-iqueryablet-has-been-ordered-or-not

This doesn't seem to work on a collection like dbSet.AsQueryable() as this will always return true on the is IOrderedQueryable check. – Juri Jan 23 '12 at 13:50

A solution

Yes you can inspect the IQueryable.Expression tree to see if it calls any of the OrderBy/ThenBy methods. Expression trees can be examined by deriving a class from ExpressionVisitor.

There is an internal OrderingMethodFinder in System.Web - which you could adapt. Here's what I came up with:
https://stackoverflow.com/questions/8507746/determine-whether-an-iqueryablet-has-been-ordered-or-not

[PascalSenn]

I changed the reference implementation slightly. This way it stops once a ordermethod is found

[PascalSenn]

I also added nameof instead of magic strings