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WeakReferenceMessenger

As explained in .NET MAUI in Action

WeakReferenceMessenger is a .NET Community Toolkit messaging component that delivers messages to recipients through weak references.

WeakReferenceMessenger is a .NET Community Toolkit messaging component that delivers messages through weak references. In a .NET MAUI app, it can notify a CollectionView when the application theme changes so the view refreshes. section 10.3.2

Refreshing a themed report

Use WeakReferenceMessenger to tell the report page’s CollectionView to refresh after a theme change. This keeps the multiplatform report display synchronized across Android, iOS, and Windows layouts. section 10.3.2

Choose the current messaging component rather than the deprecated alternative:

  • Use WeakReferenceMessenger in new .NET MAUI applications. section 10.3.2
  • Avoid Xamarin.Forms MessagingCenter because it is deprecated and scheduled for removal in .NET 8. section 10.3.2

How .NET MAUI in Action covers it

How deep it goes
Defines the messaging role and practical use, but stops short of showing registration, sending, or receiving API syntax.
Examples
Uses a multiplatform report page whose CollectionView must refresh when the application theme changes.
What it assumes
Assumes a .NET MAUI page with a CollectionView and theme handling, while introducing the messaging choice for refresh notifications.
What you can do after
Apply it via the MVVM Community Toolkit to notify a .NET MAUI view about theme changes.
How it connects
Connects weak-reference messaging with .NET MAUI, MVVM Community Toolkit, CollectionView, theme changes, and MessagingCenter.
Cover of .NET MAUI in Action
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This explainer was generated by Manning's knowledge graph from the text of .NET MAUI in Action. The section links point to the parts of the book it draws on.