How to use Func with IQueryable that returns IOrderedQueryable

Question

I'm doing some research about EF and came across a function that accepts

Func<IQueryable<Student>, IOrderedQueryable<Student>> 

and just wondering how to call that function that accepts that kind of parameter?

Answer 1

imagine function is something like that, and you've got a property Id in Student class.

public static class Helper {
    public static void Test(Func<IQueryable<Student>, IOrderedQueryable<Student>> param)
        {
            var test = 0;
        }
}

then you could use it this way

var student = new List<Student>().AsQueryable();//non sense, just for example
Helper.Test(m => student.OrderBy(x => x.Id));

m => student.OrderBy(x => x.Id) is a

Func<IQueryable<Student>, IOrderedQueryable<Student>>

(IQueryable<student> as parameter, returning a IOrderedQueryable<Student>)

or just

Helper.Test(m => m.OrderBy(x => x.Id));

In fact this doesn't make much sense without a "real" function...