LINQ multiple order by

Question

I have created a function that has the follwing parameter:

List>> orderBy = null

T

Answer 1

        foreach (Expression<Func<CatalogProduct, bool>> func in orderBy)
        {
            catalogProducts = catalogProducts.OrderBy(func);
        }

This will be OK.

Answer 2

try this

   IOrderedQueryable temp = null; 
   foreach (Expression<Func<CatalogProduct, bool>> func in orderBy) 
    { 
      if (temp == null) 
        { 
          temp = catalogProducts.OrderBy(func);
        } 
        else
        { 
          temp = temp.OrderBy(func); 
        } 
     }

Answer 3

Two problems; firstly, ThanBy should be ThenBy; secondly, ThenBy is only available on the generic type, IOrderedQueryable<T>.

So change to:

        IOrderedQueryable<CatalogProduct> temp = null;
        foreach (Expression<Func<CatalogProduct, bool>> func in orderBy) {
            if (temp == null) {
                temp = catalogProducts.OrderBy(func);
            } else {
                temp = temp.ThenBy(func);
            }
        }

and you should be sorted.