Question

I have created a property in app.xaml ( Public Static List id {get set} )
Can i add Data (Eg: App.id.Add(user.id)) to it.

So that i can take the added data from the page and use it any navigated page (Eg: App.id[3]).

Initializing is the problem when page refreshed the data goes back to App.id[0]

Answer 1

Alternativ you could use the Singleton pattern here, this will ensure that the list is created and only one instance exsist.

In your App.cs file write the following:

    private static List<string> _id;

    public static List<string> id
    {
        get
        {
            if (_id == null)
                _id = new List<string>();

            return _id;
        }

        set
        {
            _id = value;
        }
    }