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如果我想在列表中显示数据怎么办。它会覆盖我的列表。我想拥有列表格式的所有数据。请帮我解决这个问题。我正在使用代码:

    protected override void OnNavigatedTo(NavigationEventArgs e)
    {

        if (pg_addPet.settings.Contains("iso_mypet_list"))
        {

            System.Diagnostics.Debug.WriteLine("contains settings data already ...");
            pg_addPet.list_listMyPet = (List<SaveMypet>)pg_addPet.settings["iso_mypet_list"];



            if (pg_addPet.list_listMyPet != null)
            {

                listbox_mypet.Dispatcher.BeginInvoke(() =>
                {
                    listbox_mypet.ItemsSource = pg_addPet.list_listMyPet;
                });

                //listbox_mypet.ItemsSource = pg_addPet.list_listMyPet;
            }

        }
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