Pass information from one view model to another

I am using the M-V-VM architectural pattern.

I want my program to have two views, View A and View B. I start the program with View A. View B is shown by the program开发者_开发知识库 when I double click an item in View A.

How should I structure my program such that I can achieve this?

Have one ViewModel like :

• ParentViewModel
  • ChildViewModel1
    • IsVisible
    • A Command that toggles ChildViewModel's IsVisible property
  • ChildViewModel2
    • IsVisible

and View like :

• ParentView
  • ViewPart1
    • Visibility bound to ChildViewModel1.IsVisible (use BooleanToVisibilityConverter)
    • A button bound to Command that toggles Visibility
  • ViewPart2
    • Visibility bound to ChildViewModel1.IsVisible (use BooleanToVisibilityConverter)

This should solve your problem.

You might be interested in the BookLibrary sample application of the WPF Application Framework (WAF). It shows a master/detail view with two separate Views and two separate ViewModels. Additionally, it has a modal dialog inclusive an own ViewModel for the "Lend To" operation which is connected to the selected book.