Question

I have decided that all my WPF pages need to register a routed event. Rather than include

public static readonly RoutedEvent MyEvent= EventManager.RegisterRoutedEvent('MyEvent', RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(BasePage)); 

on every page, I decided to create a base page (named BasePage). I put the above line of code in my base page and then changed a few of my other pages to derive from BasePage. I can’t get past this error:

Error 12 ‘CTS.iDocV7.BasePage’ cannot be the root of a XAML file because it was defined using XAML. Line 1 Position 22. C:\Work\iDoc7\CTS.iDocV7\UI\Quality\QualityControlQueuePage.xaml 1 22 CTS.iDocV7

Does anyone know how to best create a base page when I can put events, properties, methods, etc that I want to be able to use from any wpf page?

Answer 1

Here’s how I’ve done this in my current project.

First I’ve defined a class (as @Daren Thomas said – just a plain old C# class, no associated XAML file), like this (and yes, this is a real class – best not to ask):

public class PigFinderPage : Page {     /* add custom events and properties here */ } 

Then I create a new Page and change its XAML declaration to this:

<my:PigFinderPage x:Class='Qaf.PigFM.WindowsClient.PenSearchPage'     xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'     xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'     xmlns:my='clr-namespace:Qaf.PigFM.WindowsClient'     /> 

So I declare it as a PigFinderPage in the ‘my’ namespace. Any page-wide resources you need have to be declared using a similar syntax:

<my:PigFinderPage.Resources>     <!-- your resources go here --> </my:PigFinderPage.Resources> 

Lastly, switch to the code-behind for this new page, and change its class declaration so that it derives from your custom class rather than directly from Page, like this:

public partial class EarmarkSearchPage : PigFinderPage 

Remember to keep it as a partial class.

That’s working a treat for me – I can define a bunch of custom properties and events back in ‘PigFinderPage’ and use them in all the descendants.