Question

我的window phone 7应用程序中有一个名为addFavorites的页面。它显示一个人员列表，其中包含复选框和页面底部的按钮。

在复选框的已选中和未选中的事件上，我只是添加相应的对象并将其删除到列表。

点击添加按钮后，我将填充的列表添加到隔离存储。

以下是我的代码

public partial class AddFavourites : PhoneApplicationPage
{
    public int checkedPlayers;
    public List<MarathonPlayer> selectedPlayers = null;
    public AddFavourites()
    {
        InitializeComponent();
        if (IsolatedStorageSettings.ApplicationSettings.Contains("FavouritePlayers"))
        {
            selectedPlayers = (List<MarathonPlayer>)(IsolatedStorageSettings.ApplicationSettings["FavouritePlayers"]);
        }
        else
        {
            selectedPlayers = new List<MarathonPlayer>();
        }
        listOfPlayers.ItemsSource = ManageFavourites.listSearch;

    }
    private void checkBox_Checked(object sender, RoutedEventArgs e)
    {
        MarathonPlayer mp = (sender as CheckBox).DataContext as MarathonPlayer;

        if (!IsolatedStorageSettings.ApplicationSettings.Contains("FavouritePlayers"))
        {
            selectedPlayers.Add(mp);

        }
        else
        {
            Boolean PlayerIsSelected = false;
            selectedPlayers = null;
            selectedPlayers = (List<MarathonPlayer>)(IsolatedStorageSettings.ApplicationSettings["FavouritePlayers"]);
            for (int j = 0; j < selectedPlayers.Count(); j++)
            {
                PlayerIsSelected = false;
                if (selectedPlayers[j].playerBibNum.Equals(mp.playerBibNum))
                {
                    CheckBox cb = sender as CheckBox;
                    cb.IsChecked = false;
                    PlayerIsSelected = false;
                    MessageBox.Show("The runner is already added to your favourites");
                    break;
                }
                else if (selectedPlayers.Count == 5)
                {
                    CheckBox cb = sender as CheckBox;
                    cb.IsChecked = false;
                    PlayerIsSelected = false;
                    MessageBox.Show("You cannot add more than 5 runners in your favourites");
                    break;
                }
                PlayerIsSelected = true;
            }
            if (PlayerIsSelected)
            {
                selectedPlayers.Add(mp);

            }
        }

    }

    private void checkBox_Unchecked(object sender, RoutedEventArgs e)
    {
        MarathonPlayer mp = (sender as CheckBox).DataContext as MarathonPlayer;
        selectedPlayers.Remove(mp);

    }

    private void addFav_Click_1(object sender, RoutedEventArgs e)
    {
        if (IsolatedStorageSettings.ApplicationSettings.Contains("FavouritePlayers"))
        {
            IsolatedStorageSettings.ApplicationSettings.Remove("FavouritePlayers");
        }
        IsolatedStorageSettings.ApplicationSettings["FavouritePlayers"] = selectedPlayers;
        IsolatedStorageSettings.ApplicationSettings.Save();
        this.NavigationService.Navigate(new Uri("/Race Events/Favourites/ManageFavourites.xaml", UriKind.Relative));
    }

}

问题：

当我加载应用程序时，我选中了一个复选框并按下后退按钮，表现不错。

然后我选择了一个项目并单击了添加按钮，并根据需要将数据添加到隔离存储中。

再次在隔离存储中添加一个项目后，我选中了一个复选框并单击了一个后退按钮，这次所选项目被添加到隔离存储中而不按下后退按钮，这意味着，现在ifind 2项目处于隔离存储中。

每次我只选中一个复选框并按下后退按钮，该项目就会被添加到隔离存储中，而不会按添加Butto。

我试图找出最新情况但无法找到答案。

请帮助其紧急

谢谢和问候

修改我发现更多的是如果勾选复选框并取消选中它没有这样的问题，所以我认为按下后退按钮后，所有内容都被发送到隔离存储。

Answer 1

正如@abhinav所提到的，您正在使用对存储在隔离存储中的列表的引用。因此，对列表所做的任何更改都会反映到隔离存储中。

您可以复制该列表：

selectedPlayers = new List<MarathonPlayer>((List<MarathonPlayer>)(IsolatedStorageSettings.ApplicationSettings["FavouritePlayers"]));

Answer 2

 selectedPlayers = (List<MarathonPlayer>)(IsolatedStorageSettings.ApplicationSettings["FavouritePlayers"]);

selectedPlayers是对IsolatedStorageSettings Dictionary元素的引用。所以所有更改都直接发送到您的IsolatedStorageSettings。

尝试使用

IsolatedStorageSettings mysettings = IsolatedStorageSettings.ApplicationSettings;

希望这有帮助。

孤立存储表现奇怪

2 个答案: