how to get the list of id of goods on the page of the view of the OrderSummary file

Go to Nop.Web==>Models==>ShoppingCart.cs and list of int named ProductIds. At constructor of the ShoppingCart Class add a new instance of the list of int like bellow.

  public ShoppingCartModel()
        {
            Items = new List<ShoppingCartItemModel>();
            Warnings = new List<string>();
            EstimateShipping = new EstimateShippingModel();
            DiscountBox = new DiscountBoxModel();
            GiftCardBox = new GiftCardBoxModel();
            CheckoutAttributes = new List<CheckoutAttributeModel>();
            OrderReviewData = new OrderReviewDataModel();

            ButtonPaymentMethodActionNames = new List<string>();
            ButtonPaymentMethodControllerNames = new List<string>();
            ButtonPaymentMethodRouteValues = new List<RouteValueDictionary>();

            ProductIds = new List<int>();
        }

      
public List<int> ProductIds { get; set; }

Now go to the Nop.Web==>Controllers==>ShoppingCartController.cs and add the bellow code at OrderSummary method.

 
foreach (var item in model.Items)
{
    model.ProductIds.Add(item.ProductId);
}

Now at view, you can get a list of products ids that are added to the shopping cart. To get the ProductsId at view use the below code.

@Model.ProductIds

Go to Nop.Web==>Models==>ShoppingCart.cs and list of int named ProductIds. At constructor of the ShoppingCart Class add a new instance of the list of int like bellow.

  public ShoppingCartModel()
        {
            Items = new List<ShoppingCartItemModel>();
            Warnings = new List<string>();
            EstimateShipping = new EstimateShippingModel();
            DiscountBox = new DiscountBoxModel();
            GiftCardBox = new GiftCardBoxModel();
            CheckoutAttributes = new List<CheckoutAttributeModel>();
            OrderReviewData = new OrderReviewDataModel();

            ButtonPaymentMethodActionNames = new List<string>();
            ButtonPaymentMethodControllerNames = new List<string>();
            ButtonPaymentMethodRouteValues = new List<RouteValueDictionary>();

            ProductIds = new List<int>();
        }

      
public List<int> ProductIds { get; set; }

Now go to the Nop.Web==>Controllers==>ShoppingCartController.cs and add the bellow code at OrderSummary method.

 
foreach (var item in model.Items)
{
    model.ProductIds.Add(item.ProductId);
}

Now at view, you can get a list of products ids that are added to the shopping cart. To get the ProductsId at view use the below code.

@Model.ProductIds

Can not get list in view without using source code?

Go to Nop.Web==>Models==>ShoppingCart.cs and list of int named ProductIds. At constructor of the ShoppingCart Class add a new instance of the list of int like bellow.

  public ShoppingCartModel()
        {
            Items = new List<ShoppingCartItemModel>();
            Warnings = new List<string>();
            EstimateShipping = new EstimateShippingModel();
            DiscountBox = new DiscountBoxModel();
            GiftCardBox = new GiftCardBoxModel();
            CheckoutAttributes = new List<CheckoutAttributeModel>();
            OrderReviewData = new OrderReviewDataModel();

            ButtonPaymentMethodActionNames = new List<string>();
            ButtonPaymentMethodControllerNames = new List<string>();
            ButtonPaymentMethodRouteValues = new List<RouteValueDictionary>();

            ProductIds = new List<int>();
        }

      
public List<int> ProductIds { get; set; }

Now go to the Nop.Web==>Controllers==>ShoppingCartController.cs and add the bellow code at OrderSummary method.

 
foreach (var item in model.Items)
{
    model.ProductIds.Add(item.ProductId);
}

Now at view, you can get a list of products ids that are added to the shopping cart. To get the ProductsId at view use the below code.

@Model.ProductIds

Can not get list in view without using source code?

Yes, Try like ==>

@{
    var productIds = Model.Items.Select(p=>p.ProductId).ToList();
}

//Sohel