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Privacy policy. The IMessenger interface is a contract for types that can be used to exchange messages between different objects. This can be useful to decouple different modules of an application without having to keep strong references to types being referenced. It is also possible to send messages to specific channels, uniquely identified by a token, and to have different messengers in different sections of an application.
The MVVM Toolkit provides two implementations out of the box: WeakReferenceMessenger and StrongReferenceMessenger : the former uses weak references internally, offering automatic memory management for recipients, while the latter uses strong references and requires developers to manually unsubscribe their recipients when they're no longer needed more details about how to unregister message handlers can be found below , but in exchange for that offers better performance and far less memory usage.
Types implementing IMessenger are responsible for maintaining links between recipients receivers of messages and their registered message types, with relative message handlers.
Any object can be registered as a recipient for a given message type using a message handler, which will be invoked whenever the IMessenger instance is used to send a message of that type. It is also possible to send messages through specific communication channels each identified by a unique token , so that multiple modules can exchange messages of the same type without causing conflicts.
Messages sent without a token use the default shared channel. The first lets you register all the handlers with a single call to the RegisterAll extension, which automatically registers the recipients of all the declared message handlers, while the latter is useful when you need more flexibility or when you want to use a simple lambda expression as a message handler. Both WeakReferenceMessenger and StrongReferenceMessenger also expose a Default property that offers a thread-safe implementation built-in into the package.
It is also possible to create multiple messenger instances if needed, for instance if a different one is injected with a DI service provider into a different module of the app for instance, multiple windows running in the same process. The StrongReferenceType can still be used, by passing an instance to the constructor of that class. Let's imagine this message type being used in a simple messaging application, which displays a header with the user name and profile image of the currently logged user, a panel with a list of conversations, and another panel with messages from the current conversation, if one is selected.
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