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Building Real-Life Applications with Blazor WebAssembly

Creating the ICartService Interface and CartService Class

Explore how to define the ICartService interface and implement the CartService class to manage application state in a Blazor WebAssembly shopping cart. Understand how to register CartService in the dependency injection container and use it within your Store page to add and remove products while maintaining cart persistence across pages.

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Creating the ICartService interface

We need to create an ICartService interface. We do this as follows:

  1. Return to Visual Studio.
  2. Right-click the ShoppingCart project and select the “Add, New Folder” option from the menu.
  3. Name the new folder Services.
  4. Right-click the Services folder and select the “Add, New Item” option from the menu.
  5. Enter “interface” in the “Search” box.
  6. Select “Interface.”
  7. Name the file ICartService.
  8. Click the “Add” button.
  9. Enter the following code:
C++
IList<Product> Cart{ get; }
int Total { get; set; }
event Action OnChange;
void AddProduct(Product product);
void DeleteProduct(Product product);
  1. Add the following using statement:
C++
using ShoppingCart.Models;

We have created the ICartService interface. Now we need to create a class that inherits from it.

Creating the CartService

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