CompositeWPF/Prism EventAggregation Exception

|  Posted: March 4, 2010  |  Categories: General Technical

Just a small reminded for myself. When you are using Publish/Subscribe EventAggregation mechanism provided by PRISM along with Unity to resolve types. It’s important to specify the Action method on subscribe to be public.

Example:

TextChangedEvent evt = eventAggregator.GetEvent<TextChangedEvent>();
evt.Subscribe(OnSubscibeForNewText);

///

///

public void OnSubscibeForNewText(string payload)

If it’s not public, Unity will have issues resolving the type and you’ll see an exception as shown below

Attempt by method ‘Microsoft.Practices.Composite.Events.DelegateReference.TryGetDelegate()’ to access method ‘ModuleA.ViewModel.ModuleAView2VM.OnSubscibeForNewText(System.String)’ failed.

Author: Saravana Kumar

Saravana Kumar is the Founder and CTO of BizTalk360, an enterprise software that acts as an all-in-one solution for better administration, operation, support and monitoring of Microsoft BizTalk Server environments.

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