asp.net mvc order items based on parameters in controller - asp.net-mvc

Question

I'd like to order some products based on prices. What are the parameters I pass to my action and how do I use it in sorting from an IQueryable<Product>?
For eg. this is what I currently have:
public ActionResult Index(int page =0, int cat = 0, int subCat =0)
{
var products = productService.GetAllProducts();
ProductListViewModel model = new ProductListViewModel();
if (cat > 0)
{
products = products.Where(p => p.SubCategory.CategoryId == cat);
}
if (subCat > 0)
{
products = products.Where(p => p.SubCategory.SubCategoryId == subCat);
}
products = products.OrderBy(p => p.CreatedDate);
model.PagedProducts = products.ToPagedList(page, 15);
return View(model);
}

Answer 1

You may checkout the following article.

Answer 2

You may pass any variable you want. An int should be enough but you may also use a string.
public ActionResult Index(int page =0, int cat = 0, int subCat =0, int order = 0)
{
var products = productService.GetAllProducts();
ProductListViewModel model = new ProductListViewModel();
if (cat > 0)
{
products = products.Where(p => p.SubCategory.CategoryId == cat);
}
if (subCat > 0)
{
products = products.Where(p => p.SubCategory.SubCategoryId == subCat);
}
switch(order)
{
case 0:
products = products.OrderBy(p => p.CreatedDate);
break;
case 1:
products = products.OrderBy(p => p.Price);
break;
}
model.PagedProducts = products.ToPagedList(page, 15);
return View(model);
}

Answer 3

Replace
products = products.OrderBy(p => p.CreatedDate);
with
products = products.OrderBy(p => p.Price);

Answer 4

If you have a bool flag that you pass in then you can use it to toggle the sort:
public ActionResult Index(int page, int cat, int subCat, int order, bool isAscending)
{
var products = productService.GetAllProducts();
if (isAscending)
products = products.OrderBy(prod => prod.Price);
else
products = products.OrderByDescending(prod => prod.Price);
// Other code...
}