radzen-blazor/RadzenBlazorDemos/Pages/NotificationClickHandler.razor

@inject NotificationService NotificationService

<div class="rz-p-12 rz-text-align-center">
    <RadzenButton Text="Show notification with custom click handler" 
                  Click="@(args => ShowNotification(new NotificationMessage { Severity = NotificationSeverity.Info, Summary = "Info Click Summary", Detail = "Click Me", Duration = 4000, Click=NotificationClick, CloseOnClick = true, Payload = DateTime.Now }))" />
</div>

<EventConsole @ref=@console />

@code {
    EventConsole console;

    void ShowNotification(NotificationMessage message)
    {
        NotificationService.Notify(message);

        console.Log($"{message.Severity} notification");
    }

    void NotificationClick(NotificationMessage message)
    {
        console.Log($"{message.Summary} clicked, Payload = {message.Payload}");
    }
}