How can I save global application variables in WPF?

Question

In WPF, where can I save a value when in one UserControl, then later in another UserControl access that value again, something like session

Answer 1

Something like this should work.

public static class ApplicationState 
{ 
    private static Dictionary<string, object> _values =
               new Dictionary<string, object>();

    public static void SetValue(string key, object value) 
    {
        _values.Add(key, value);
    }

    public static T GetValue<T>(string key) 
    {
        return (T)_values[key];
    }
}

Answer 2

Could just store it yourself in a static class or repository that you can inject to the classes that need the data.

Answer 3

You can expose a public static variable in App.xaml.cs file and then access it anywhere using App class..

Answer 4

The Application class already has this functionality built in.

// Set an application-scope resource
Application.Current.Resources["ApplicationScopeResource"] = Brushes.White;
...
// Get an application-scope resource
Brush whiteBrush = (Brush)Application.Current.Resources["ApplicationScopeResource"];