instantiate navigationservice class

I was working on a WPF project today that had a main nav window and then 4 pages that were loaded within this main window (using NavigationService.Nagivate...).. Within the XAML this created a lot of duplicate code so I wanted to refactor the menu into a user control that I could then bind to each page. I tried to create a class to handle the navigation and loading of each page but I discovered that NavigationServices is a sealed class and cannot be instantiated.

Would anyone please provide a suggestion/solution on how to create a usercontrol with a menu item that will allow the ability to navigate to new pages within the project. I ha开发者_高级运维ve been able to do this within pages and the direct code behind but I have not had any luck trying to separate the two. If this is too vague please let me know and I will provide more deails with code samples.

Thanks in advance

Create a NavigationService dependency property on your user control. Then, when you instantiate your control, bind this property to the NavigationService of the container where the navigation should occur. For example, a page might display the user control like this:

<local:NavBox NavigationService="{Binding NavigationService, RelativeSource={RelativeSource AncestorType={x:Type NavigationWindow}}}" />

Now when your UserControl calls Navigate on its NavigationService, that will effectively call Navigate on the containing NavigationWindow's NavigationService. (This can be modified in the obvious way to support Frame or Page instead of NavigationWindow.)