MVC 4 _Layout.cshtml viewmodel

Question

I want to display a count of selected items on every page in my MVC site. I have a ViewModel that defines the properties I want there

public class CartViewModel
{
    public List<CartItem> CartItems { get; set; }
    public decimal CartTotal { get; set; }
}

a controller that gets the Cart, maps it to the view model and passes that on

public ActionResult GetCartSummary()
{
    var cart = Cart.Instance;
    var viewModel = AutoMapper.Mapper.Map<Cart, CartViewModel>(cart);
    return View(viewModel);
}

and a view for that

@model TheWorkshop.Web.Models.Edit.ShoppingCartViewModel

<h2>Cart Summary</h2>
<span>@Model.CartTotal</span>

and finally in my _Layout.cshtml file

@Html.Action("GetCartSummary", "Cart")

But this gives me

System.StackOverflowException was unhandled

Justin Helgerson · Accepted Answer · 2013-04-10 21:30:10Z

6

Try adding the following to your cart view:

@{Layout = null;}

answered Apr 10, 2013 at 21:30

Justin Helgerson

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1 Comment

Simon Martin Over a year ago

This works nicely; would never have guessed it was the recursing views

AaronLS · Accepted Answer · 2013-04-10 21:31:40Z

3

Try returning a PartialView instead of View:

public ActionResult GetCartSummary()
{
    var cart = Cart.Instance;
    var viewModel = AutoMapper.Mapper.Map<Cart, CartViewModel>(cart);
    return PartialView(viewModel);
}

answered Apr 10, 2013 at 21:31

AaronLS

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4 Comments

Travis J Over a year ago

This will work as well because PartialView implicitly sets Layout = null.

Simon Martin Over a year ago

Someone told me only use a partial view if you need to use it elsewhere. Is this a recommended approach?

AaronLS Over a year ago

You use a PartialView anytime you are nesting a view in another view, because otherwise, you will get all of your layout stuff surrounding where the view is nested. I.e. your header Menus/LOGO will be duplicated and it will look terrible.

AaronLS Over a year ago

Maybe they were thinking of shared views. I keep my View and PartialViews for a controller in the same folder. Except when the PartialView is going to be used elsewhere, then in that case I put them in the Shared Views folder.

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