Question

嗨，我是wp8的新手，我正在尝试开发一个应用程序。我有一些问题要从我的字典我不知道这里的错误是我的代码

for (int i = 0; i < SharedInformation.tab.Length; i++)
{
    lsCategorie.Clear();
    for (int j = 0; j < SharedInformation.SharedLscitation.Count; j++)
    {
        if (SharedInformation.tab[i].Equals(SharedInformation.SharedLscitation[j].categorie.ToString()))
        {
            lsCategorie.Add(SharedInformation.SharedLscitation[j]);
        }
    }
    SharedInformation.dic.Add(SharedInformation.tab[i], lsCategorie);
}

和我的电话

lsCitation = new List<Citation>();
lsCitation = (List<Citation>) SharedInformation.dic["amour"];

listbox.DataContext = lsCitation;

我的完整代码

 public partial class MainPage : PhoneApplicationPage
{
    private Popup popup;
    private BackgroundWorker backroungWorker;
    ShareStatusTask quotesh = new ShareStatusTask();
    SmsComposeTask quotesms = new SmsComposeTask();
    List<Citation> lsCitation = new List<Citation>();
    List<Citation> lsCategorie = new List<Citation>();

    // Constructeur
    public MainPage()
    {
        InitializeComponent();
        ShowSplash();

    }

    private void ShowSplash()
    {
        this.popup = new Popup();
        this.popup.Child = new SplashScreen();
        this.popup.IsOpen = true;
        StartLoadingData();
    }

    private void StartLoadingData()
    {
        backroungWorker = new BackgroundWorker();
        backroungWorker.DoWork += new DoWorkEventHandler(backroungWorker_DoWork);
        backroungWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(backroungWorker_RunWorkerCompleted);
        backroungWorker.RunWorkerAsync();
    }

    void backroungWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
        this.Dispatcher.BeginInvoke(() =>
        {
            this.popup.IsOpen = false;

        }
        );
    }

    void backroungWorker_DoWork(object sender, DoWorkEventArgs e)
    {
        //here we can load data
        Thread.Sleep(9000);

        if (IsolatedStorageSettings.ApplicationSettings.Contains("data") == false)
        {
            InitializeComponent();
            WebClient web = new WebClient();
            web.DownloadStringCompleted += web_DownloadStringCompleted;
            string uri = "http://quotesconsommation.azurewebsites.net/json/json.php";
            web.DownloadStringAsync(new Uri(uri));
            IsolatedStorageSettings.ApplicationSettings["data"] = 1;
            IsolatedStorageSettings.ApplicationSettings["citation"] = lsCitation;
            SharedInformation.SharedLscitation = lsCitation;
            MessageBox.Show("" + NetworkInterface.GetIsNetworkAvailable() + "");

        }
        else
        {
            SharedInformation.SharedLscitation = IsolatedStorageSettings.ApplicationSettings["citation"] as List<Citation>;
        }
        for (int i = 0; i < SharedInformation.tab.Length; i++)
        {
            lsCategorie.Clear();
            for (int j = 0; j < SharedInformation.SharedLscitation.Count; j++)
            {

                if (SharedInformation.tab[i].Equals(SharedInformation.SharedLscitation[j].categorie.ToString()))
                {
                    lsCategorie.Add(SharedInformation.SharedLscitation[j]);
                }
            }
            SharedInformation.dic.Add(SharedInformation.tab[i], lsCategorie);
        }
    }
    void web_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
    {
        var rootObject = JsonConvert.DeserializeObject<RootObject>(e.Result);


        foreach (var blog in rootObject.citation)
        {
            lsCitation.Add(blog);
        }

我打电话的地方

 List<Citation> lsCitation;
    public TOUTES()
    {
        InitializeComponent();


        lsCitation = new List<Citation>();
        lsCitation = (List<Citation>) SharedInformation.dic["amour"];

        listbox.DataContext = lsCitation;

    }

mu sharedinformation class

public static class SharedInformation
{

    public static Citation Sharedcitation;
    public static List<Citation> SharedLscitation;
    public static Dictionary<string, List<Citation>> dic = new Dictionary<string, List<Citation>>();
    public static String[] tab = { "amour", "art et spectacle", "arts et creation", "bonheur", "cinema", "cultures", "famille", "fetes", "humour", "insolite", "livres et lettres", "musique", "nature", "philosophie", "pratique", "proverbes", "sagesse", "sciences", "sport et loisirs", "theatre", "travail" };
    public static bool connectionstatus;
}

Answer 1

您无法在Clear()上致电List<T> - 您需要每次都换一个新的：{/ p>

for (int i = 0; i < SharedInformation.tab.Length; i++) 
{ 
    // Make a new list, don't reuse it!
    lsCategorie = new List<object>(); 
    for (int j = 0; j < SharedInformation.SharedLscitation.Count; j++) 
    {

由于List<T>是引用类型（类），因此每次添加时，它都不会添加列表的整个副本 - 它只是将引用添加到同一列表中。下次循环时，清除旧列表并向其添加新项目等。

因此，您将看到的行为是，每个键都会包含 last 标签项目中的项目，因为它们都是完全相同的List<T>实例。

wp8 dictionary <string，list <object>＆gt;解决</串，列表的<object>

1 个答案: