How to check for the presence of an OrderBy in a ObjectQuery expression tree

Question

I\'m using T4 for generating repositories for LINQ to Entities entities.

The repository contains (amongst other things) a List method suitable for paging. The docum

Answer 1

You can address this in the return type of ProvideDefaultSorting. This code does not build:

    public IOrderedQueryable GetOrderedQueryable()
    {
        IQueryable myInts = new List() { 3, 4, 1, 2 }.AsQueryable();
        return myInts.Where(i => i == 2);
    }

This code builds, but is insidious and the coder gets what they deserve.

    public IOrderedQueryable GetOrderedQueryable()
    {
        IQueryable myInts = new List() { 3, 4, 1, 2 }.AsQueryable();
        return myInts.Where(i => i == 2) as IOrderedQueryable;
    }

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Same story with ref (this does not build):

    public void GetOrderedQueryable(ref IOrderedQueryable query)
    {
        query = query.Where(i => i == 2);
    }