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  • Presentation
    • AbstractViewModel
    • Conventions
      • Bootstrap Conventions
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    • Commands and DelegateCommand
    • IViewResolver
      • Default view behaviors
      • view life cycle events
        • Callback expectations
        • notify messages
    • Message broker MVVM built-in messages
    • Application boot process
      • Application configuration
      • Application shutdown
      • Singleton applications
    • AbstractMementoViewModel
      • Simple ViewModel graphs
      • Collections and complex ViewModel graphs
    • Validation and Validation Services
    • Resources
      • Services as resources
      • ViewModels as resources
  • UI Composition
    • UI Composition
      • Region content lifecycle
      • TabControl region
      • Create a custom region
  • Concepts
    • Inversion of Control
      • Third party DI containers
    • Entities
      • Property System
    • Messaging and Message Broker
      • POCO messages
      • Standalone message handlers
    • Observers
      • PropertyObserver
      • MementoObserver
      • BrokerObserver
  • Memento
    • Change Tracking Service
      • MementoEntity and MementoEntityCollection
      • Handling change tracking:
        • Simple model
        • Collections
        • Complex objects graph
      • Atomic operations
      • Change Tracking Service API
      • Property Metadata for the ChangeTrackingService
      • Handling collection sync
      • Property State
  • Behaviors
    • DataGrid Behaviors
    • Password
    • Generic routed event handler to command behavior
    • Overlay adorner
      • Busy status manager
    • TextBox behaviors:
      • Command
      • Auto select
      • DisableUndoManager (.Net 3.5 only)
  • Markup Extensions
    • Editor binding
    • Auto Command binding
  • How to
    • Get the view of a given view model
    • Bi-directional communication between different windows/views
    • Handle the busy status during async/long running operations
    • Implement a customer improvement program
    • Manage focus
    • Create a splash screen
    • Access view model after view is closed
    • Intercept ViewModels before they are used
  • Upgrade guides
    • Radical Presentation 1.x to Radical 2.x for .NET Core
    • Radical 2.0.0 to Radical 2.1.0
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  1. How to

Get the view of a given view model

There are cases where given a running ViewModel we need to retrieve an instance of the currently associated View, the runtime conventions object exposes a convention to achieve that:

class MyViewModel : AbstractViewModel
{
    public MyViewModel(  IConventionsHandler conventions )
    {
        var view = conventions.GetViewOfViewModel( this );
    }
}

Since the conventions are handled by the underlying Inversion of Control subsystem we can access the conventions using a dependency, as in the above sample.

Notes:

if we take a look at the signature (Func<Object, DependencyObject>) of the above convention we notice that the “in” parameter is an Object and is not constrained to be an AbstractViewModel, this is in line with the fact that for the Radical toolkit a ViewModel is not required to be an AbstractViewModel, but if you need to use the above convention or the UI Composition system be aware that if the ViewModel is not an AbstractViewModel you end up with 2 options:

  • implement on your view model the IViewModel interface;

  • or replace the AttachViewToViewModel convention that is responsible to reverse link the View to the ViewModel;

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Last updated 3 years ago