BlazorAppli/BlazorTest1/Modals/DeleteConfirmation.razor.cs

public partial class DeleteConfirmation
{
    [CascadingParameter]
    public BlazoredModalInstance ModalInstance { get; set; }

    [Inject]
    public IDataService DataService { get; set; }

    [Parameter]
    public int Id { get; set; }

    private Item item = new Item();

    protected override async Task OnInitializedAsync()
    {
        // Get the item
        item = await DataService.GetById(Id);
    }

    void ConfirmDelete()
    {
        ModalInstance.CloseAsync(ModalResult.Ok(true));
    }

    void Cancel()
    {
        ModalInstance.CancelAsync();
    }
}