DialogFactoryTest.razor

<TestComponent Id="123"></TestComponent>

TestComponent.razor

<TelerikButton OnClick="@ShowAlert">Show Alert</TelerikButton>
<TelerikButton OnClick="@ShowAlertWithTitle">Show Alert with Custom Title</TelerikButton>

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

    protected override async Task OnParametersSetAsync()
    {
        Console.WriteLine(Id);
    }

    [CascadingParameter]
    public DialogFactory Dialogs { get; set; }

    public async Task ShowAlert()
    {
        await Dialogs.AlertAsync("Something went wrong!");

        Console.WriteLine("The user dismissed the alert box.");
    }

    async Task ShowAlertWithTitle()
    {
        await Dialogs.AlertAsync("Something went wrong!", "Read this!");

        Console.WriteLine("The user dismissed the alert box with the custom title.");
    }
}