Return to current url in asp.net mvc

Question

I have a method:

public ActionResult AddProductToCart(int productId)
    {
        var product = _productService.GetProductById(productId);
        if (product == null)
            return RedirectToAction("Index", "Home");

        int productVariantId = 0;
        if (_shoppingCartService.DirectAddToCartAllowed(productId, out productVariantId))
        {
            var productVariant = _productService.GetProductVariantById(productVariantId);
            var addToCartWarnings = _shoppingCartService.AddToCart(_workContext.CurrentCustomer,
                productVariant, ShoppingCartType.ShoppingCart,
                string.Empty, decimal.Zero, 1, true);
            if (addToCartWarnings.Count == 0)
                //return RedirectToRoute("ShoppingCart");
            else
                return RedirectToRoute("Product", new { productId = product.Id, SeName = product.GetSeName() });
        }
        else
            return RedirectToRoute("Product", new { productId = product.Id, SeName = product.GetSeName() });
    }

You see the line which is commented out: I want there to not trigger any redirect but just stay on the same page from where this request was made.

If I put return View() it's not fine because it will search for View with this name while this method is a simple action to add to cart..

Can you please give me a solution of how to Redirect to current url or to stay on the same page?

Answer 1

Assuming you mean return to where you were before visiting that controller:

return Redirect(Request.UrlReferrer.ToString());

Keep in mind that if you POSTed to get to that [previous] page, you're going to be at a loss since you're not mimicking the same request.

Answer 2

You could pass an additional returnUrl query string parameter to this method indicating the url to get back to once the product has been added to the cart:

public ActionResult AddProductToCart(int productId, string returnUrl)

so that you can redirect back to wherever you were:

if (addToCartWarnings.Count == 0)
{
    // TODO: the usual checks that returnUrl belongs to your domain
    // to avoid hackers spoofing your users with fake domains
    if (!Url.IsLocalUrl(returnUrl))
    {
        // oops, someone tried to pwn your site => take respective actions
    } 
    return Redirect(returnUrl);
}

and when generating the link to this action:

@Html.ActionLink(
    "Add product 254 to the cart", 
    "AddProductToCart", 
    new { productId = 254, returnUrl = Request.RawUrl }
)

or if you are POSTing to this action (which by the way you should probably be because it is modifying state on the server - it adds a product to a cart or something):

@using (Html.BeginForm("AddProductToCart", "Products"))
{
    @Html.Hidden("returnurl", Request.RawUrl)
    @Html.HiddenFor(x => x.ProductId)
    <button type="submit">Add product to cart</button>
}

Another possibility is to use AJAX to invoke this method. This way the user will stay on the page wherever he was before calling it.