Pass complex object between pages in C#

Question

I am using this code to pass values in my Windows 8 app.

The following code passes data to a page when an item is clicked, So it passes sectorId to the Quiz page.

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Answer 1

The Frame.Navigate method takes an object as a parameter, and really doesn't care what type of object it is. You can create any kind of object and pass it as the second parameter.

public struct QuizArgs
{
    public string Question;
    public string[] Answers;
    public int CorrectIndex;
    public DateTime Timestamp;
}




private void quizbtn_Click(object Sender, RoutedEventArgs e)
{
    var args = new QuizArgs
    {
        Question = "What color is the sky?",
        Answers = new string[] { "Red", "Green", "Blue", "Silver" },
        CorrectIndex = 2,
        Timestamp = DateTime.Now
    };

    this.Frame.Navigate(typeof(Quiz), args);
}

And in your Quiz class:

protected override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
{
    if (navigationParameter == null)
        throw new ArgumentNullException("navigatyionParameter");
    QuizArgs args = navigationParameter as QuizArgs;
    if (args == null)
        throw new ArgumentException(string.Format("Incorrect type '{0}'", navigationParameter.GetType().Name), "navigationParameter");

    // Do something with the 'args' data here
}

Answer 2

Passing data between pages is usually done using the query-string (GET) or by using a form (POST). You cannot really pass a complex object between pages, unless you serialize it to a string first and then use the before mentioned methods (GET/POST), but that's not recommended due to length restrictions.

However, you can use the session state and/or the application state to store complex objects (as long as they are serializable) and use them across different requests.