WPF - How to access method declared in App.xaml.cs?

Question

How can I access, using C#, a public instance method declared in App.xaml.cs?

score 75 · Accepted Answer · answered Oct 22 '09 at 18:35

75

((App)Application.Current).YourMethod ....

answered Oct 22 '09 at 18:35

Akash Kava

It works, but I don't understand. If Application.Current == App, and they are the same type, how is this type-cast working? Thanks – Gus Cavalcanti Oct 22 '09 at 18:58
2

Application is System.Windows.Application where else App is inside your project derived from Application, Application.Current is of type Application, not App. – Akash Kava Oct 22 '09 at 19:08
1

Thanks. Is it possible to do this right from a xaml-view ? (Like _Click="App.YourMethod"_) – mYnDstrEAm Oct 10 '14 at 12:26

score 4 · Answer 2 · answered Oct 22 '09 at 18:39

4

Have you considered to create a separate class to hold your application wide methods (eg. AppState.cs)?

answered Oct 22 '09 at 18:39

thomasmartinsen

This is a better approach, but I wanted to know how to see the stuff declared in App.xaml.cs. Thanks. – Gus Cavalcanti Oct 22 '09 at 18:56
7

I'm curious what you had in mind with this suggestion. You still need a place to store it. Where better to store an application-wide method than in your application class? How else would you be able to access it from any window? – Jonathan Wood Jun 22 '16 at 17:00

score 0 · Answer 3 · answered Oct 22 '21 at 14:02

You can also add a static property in your App class with new modifier like so:

public static new App Current => Application.Current as App;

This way you can access your method like so:

App.Current.YourMethod()

Check this answer about new modifier on SO.

3 Answers3