EventHandlerBehavior vs EventToCommandBehavior

Issue

In Xamarin Forms what is the difference between the EventHandlerBehavior and EventToCommandBehavior? I have been using the former successfully, but the latter was suggested to me to use instead. EventToCommandBehavior is less verbose which is a good thing.

Solution

About difference between EventHandlerBehavior and EventToCommandBehavior, I have some point, you can take a look:

For EventHandlerBehavior, you need to install Behaviors.Forms in your project firstly, behaviors let you add functionality to controls without having to subclass them. Instead, the functionality is implemented in a behavior class and attached to the control as if it was part of the control itself. Behaviors enable you to implement code that you would normally have to write as code-behind, because it directly interacts with the API of the control in such a way that it can be concisely attached to the control and packaged for reuse across more than one app.

For EventToCommandBehavior,the EventToCommandBehavior is a custom class, there are need you create EventToCommandBehavior class derives from the BehaviorBase class firstly, then implementing Bindable Properties, for detailed info, you can take a look: https://docs.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/behaviors/reusable/event-to-command-behavior

So I suggest you can use EventHandlerBehavior, because you don't need to create many code behind.

2021 Edit

EventHandlerBehavior from community-toolkit is now equivalent to EventHandlerBehavior.

Documentation: https://docs.microsoft.com/en-us/xamarin/community-toolkit/behaviors/eventtocommandbehavior

Answered By - Cherry Bu - MSFT