Passing parameters to a WPF Page via its Uri

Question

In the context of a navigation-style WPF application (NavigationWindow, not XBAP):

Is it possible for a Hyperlink's NavigateUri to contain extra parameters, like path data or a querystring? E.g., is there some way I could set my NavigateUri to /Product.xaml/123 or /Product.xaml?id=123, and have my Product.xaml page be able to see that it was called with a parameter of 123?

Answer 1

You should read up on WPF commanding... http://msdn.microsoft.com/en-us/library/ms752308.aspx

Answer 2

You can do this. See http://www.paulstovell.com/wpf-navigation:

Although it's not obvious, you can pass query string data to a page, and extract it from the path. For example, your hyperlink could pass a value in the URI:

<TextBlock>
    <Hyperlink NavigateUri="Page2.xaml?Message=Hello">Go to page 2</Hyperlink>
</TextBlock>

When the page is loaded, it can extract the parameters via NavigationService.CurrentSource, which returns a Uri object. It can then examine the Uri to pull apart the values. However, I strongly recommend against this approach except in the most dire of circumstances.

A much better approach involves using the overload for NavigationService.Navigate that takes an object for the parameter. You can initialize the object yourself, for example:

Customer selectedCustomer = (Customer)listBox.SelectedItem;
this.NavigationService.Navigate(new CustomerDetailsPage(selectedCustomer));

This assumes the page constructor receives a Customer object as a parameter. This allows you to pass much richer information between pages, and without having to parse strings.

Answer 3

Hi, I'm a newbie to this so could anyone share some light how to retrieve(in this case) the selectedCustomer parameter from the target page?

Answer 4

Customer selectedCustomer = (Customer)listBox.SelectedItem; this.NavigationService.Navigate(new CustomerDetailsPage(selectedCustomer));

Paul stovel I think that use your suggestion will make your pages not garbage collected. Because the whole instance will remain on Journal.