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When the page is loaded, the product ID is retrieved from the query string. Next, an instance of the purchasing cart class is created and used to call the AddToCart method that you simply added earlier on this tutorial. The AddToCart technique, contained within the file, includes the logic so as to add the selected product to the shopping cart or increment the product amount of the chosen product. If the product hasn’t been added to the shopping cart, the product is added to the CartItem table of the database. If the product has already been added to the purchasing cart and the person provides a further merchandise of the identical product, the product amount is incremented in the CartItem table. Finally, the page redirects back to the page that you will add within the next step, where the person sees an updated record of items within the cart.
Earlier in this tutorial series, you added pages and code to view product data from a database. In this tutorial, you’ll create a purchasing cart to manage the merchandise that users are thinking about shopping for. Users will have the ability to browse and add items to the procuring cart even if they don’t seem to be registered or logged in. To manage buying cart access, you’ll assign users a unique ID using a globally unique identifier (GUID) when the person accesses the shopping cart for the primary time. You’ll store this ID utilizing the Session state.
The CartItem class accommodates the schema that can define each product a person adds to the shopping cart. This class is similar to the opposite schema lessons you created earlier on this tutorial series. By conference, Entity Framework Code First expects that the primary key for the CartItem table shall be both CartItemId or ID. However, the code overrides the default behavior through the use of the data annotation Key attribute. The Key attribute of the ItemId property specifies that the ItemID property is the first key.
The web page features a GridView management named CartList. This control makes use of mannequin binding to bind the shopping cart knowledge from the database to the GridView management. When you set the ItemType property of the GridView control, the data-binding expression Item is out there within the markup of the control and the control turns into strongly typed. As talked about earlier on this tutorial series, you may select particulars of the Item object using IntelliSense. To configure an information control to make use of model binding to pick out information, you set the SelectMethod property of the management. In the markup above, you set the SelectMethod to make use of the GetShoppingCartItems method which returns an inventory of CartItem objects. The GridView information management calls the strategy at the acceptable time within the web page life cycle and routinely binds the returned information. The GetShoppingCartItems method should still be added.