[Link] Xamarin MessagingCenter, publish/subscribe 기반으로 coupling 간단한 message 전달 방법

View model과 다른 component간에 message를 사용하여 연동될 수 있도록 하는 방법이고 message에 대해서 subscribe, publish 하여 사용하므로 coupling을 줄일 수 있다.


: https://developer.xamarin.com/guides/xamarin-forms/application-fundamentals/messaging-center/
 

Simple String Message

The simplest message contains just a string in the message parameter. A Subscribe method that listens for a simple string message is shown below - notice the generic type specifying the sender is expected to be of type MainPage. Any classes in the solution can subscribe to the message using this syntax:

MessagingCenter.Subscribe<MainPage> (this, "Hi", (sender) => {
    // do something whenever the "Hi" message is sent
});

In the MainPage class the following code sends the message. The this parameter is an instance of MainPage.

MessagingCenter.Send<MainPage> (this, "Hi");

The string doesn't change - it indicates the message type and is used for determining which subscribers to notify. This sort of message is used to indicate that some event occurred, such as "upload completed", where no further information is required.

하지만 뭐든지 남용하는 건 안될 것 같다.
다음은 MessagingCenter를 사용하지 않아도 될 부분들을 정리해 놓은 내용이다.

Misuses Of MessagingCenter
: https://xamarinhelp.com/common-misuse-messagingcenter/