Question

I have a Pivot on MainPage.xaml; how can I call this from another class?

MainPage.mypivot.Items.Add(p);


Error 2 An object reference is required for the non-static field, method, 
or property '...MainPage.mypivot'   H:\Users\Lacroix\documents\...

Answer 1

You can’t do that exactly because of the reason the compiler tells you. MainPage is not a static class, when you view the page an instance of the class is being displayed, so you need to manipulate that instance. What you can do is pass a reference to the MainPage class to the other class. Then have MainPage contain an instance of the other class.

In MainPage.xaml.cs

public partial class MainPage : PhoneApplicationPage
{
  private MyClass _myClass;

  MainPage()
  {
    _myClass = new MyClass( this );

  }
}

Now, MyClass will have access to the Pivot (and all other elements of MainPage).

If whatever logic the other class uses to add items to the Pivot is not available when displaying MainPage, i.e. you need to add items when displaying some other page, you’ll need to create a static list (say PivotItemsList) in the App class. Have the other class add items to this list instead of directly to the Pivot. You can then access this within the MainPage constructor as App.PivotItemsList and add the items to the Pivot.