Delegating with EventCallback

In this recipe, we explore event delegation with the help of EventCallback. EventCallback in Blazor is a mechanism that enables components to listen for and react to user-generated events or interactions, tying closely with the framework’s architectural design. This Blazor-native feature empowers developers to write cleaner, more efficient code by seamlessly integrating with the component lifecycle and the overall application state. The primary benefit of event callbacks is their ability to automatically manage UI updates through the StateHasChanged() method, ensuring that the user interface remains in sync with the application’s state. EventCallback is also a null-safe object – when it’s not assigned but invoked, it safely skips rather than throwing NullReferenceException. You will see EventCallback in all the recipes in this chapter, as it’s a building block of most interactivity in Blazor.

Let’s implement...