raising events passing parameters in wpf

Question

I'd like to add tabs to my window when an item in the GridView is double-clicked. But the tab that will be added depends on the clicked item. Which way should I do this on WPF? I thought about RoutedEvents, but I don't know how to pass a parameter with it. Any suggestions?

Answer 1

This codeproject article covers using a new RoutedEvent with a different argument type than just RoutedEventArgs (rather far down, search for "Second using custom RoutedEventArgs"), though I wish WPF included a version of RoutedEventHandler like the CLR's EventHandler<T> where T : EventArgs so you didn't have to declare a new delegate every time.

The summary:

• Create a new type that subtypes RoutedEventArgs and has properties for your data.
• Make sure your RoutedEventArgs subtype implements the non-default constructors of RoutedEventArgs as those are needed for it to work.
• Declare a new delegate that matches this subtype.
• Use as you would any other custom event in your code (also covered in that link).

Answer 2

Use commands rather than routed events:

Set a command for the clicked item and pass the clicked item's reference as the command's parameter using RelativeSource binding in the XAML.