Managed Extensibility Framework(MEF)

MEF is the creation of extensible applications. It offers discovery and composition capabilities that you can leverage to load application extensions (.dll's).
It provides a standard way for the host application to expose itself and consume external extensions; sets of discovery approaches for your application to locate and load available extensions; and tagging extensions with additonal metadata which facilitates querying and filtering.

Caliburn: An Application Framework for WPF

Today, I've learned how to use caliburn framework in Model-View-View Model(MVVM) designed pattern.
Without using the application framework, you can set your event in your view.xaml by this:



in your view.cs, you need to hard code this:
void MouseEnter(object sender, MouseEventArgs e)
{
//code here
}

using the implementation above, it breaks the rule of MVVM, the view classes have no idea that the model classes exist, while the ViewModel and model are unaware of the view.

but using caliburn, you need to add this to your view.xaml by



in your viewmodel.cs,
public void OnMouseEnter(MouseEventArgs e)
{
//code here
}