@page "/editcustomer/{customerid}" 
@inject INorthwindService service 
@inject NavigationManager navigation

<h3>Edit Customer</h3>

<CustomerDetail ButtonText="Update"
                Customer="@customer" 
                OnValidSubmit="@Update" />

@code {
  [Parameter]
  public string CustomerId { get; set; } = null!;

  private Customer? customer = new();

  protected async override Task OnParametersSetAsync()
  {
    customer = await service.GetCustomerAsync(CustomerId);
  }

  private async Task Update()
  {
    if (customer is not null)
    {
      await service.UpdateCustomerAsync(customer);
    }

    navigation.NavigateTo("customers");
  }
}