Question

我正在使用数据透视视图为用户预览数据的Windows手机应用程序，数据来自网络服务，然后我把它放在列表中然后我将项目添加到数据透视图但是当我调用Web服务时，视图不会等到我从服务器获取数据添加到视图中并且视图没有添加任何内容，这是我的代码

   public class downloads : List<Downloaded>
{
    List<string> downoladedList = new List<string>();
    public downloads()
    {
        BuildCollection();
    }

    //private const string IMG_PATH = "../Images/";

    public ObservableCollection<Downloaded> DataCollection { get; set; }

    public ObservableCollection<Downloaded> BuildCollection()
    {
        // int  x=0;
        Downloaded downObject = new Downloaded();
        ServiceReference1.Service1Client service = new ServiceReference1.Service1Client();
        service.GetDownloadsCompleted += new EventHandler<ServiceReference1.GetDownloadsCompletedEventArgs>(GetDownLoads);
        System.Threading.Thread.Sleep(100000);
        service.GetDownloadsAsync(20019);



        DataCollection = new ObservableCollection<Downloaded>();
        foreach (var elem in downoladedList)
        {
            string[] elemProp = new string[8];
            elemProp = elem.Split('=');
            if (elemProp[3] == "1")
                elemProp[3] = "downloaded";
            else
                elemProp[3] = "in progress";

            DataCollection.Add(new Downloaded(elemProp[1], elemProp[3], "test.png"));
        }



        return DataCollection;
    }

    public void GetDownLoads(object sender, ServiceReference1.GetDownloadsCompletedEventArgs e)
    {
        try
        {
            downoladedList = e.Result.ToList<string>();


        }
        catch (Exception ee)
        {

        }
    }
}

Answer 1

您无法拨打thread.sleep。这将阻止整个UI线程。声明DataCollection = new ObservableCollection（）; 外部范围。您应该完成所有代码的完成，如下所示：

 public void GetDownLoads(object sender, ServiceReference1.GetDownloadsCompletedEventArgs e)
{
    try
    {
        downoladedList = e.Result.ToList<string>();

        foreach (var elem in downoladedList)
        {
        string[] elemProp = new string[8];
        elemProp = elem.Split('=');
        if (elemProp[3] == "1")
            elemProp[3] = "downloaded";
        else
            elemProp[3] = "in progress";

        DataCollection.Add(new Downloaded(elemProp[1], elemProp[3], "test.png"));
        }
    }
    catch (Exception ee)
    {

    }
}

带动态数据的数据透视图

1 个答案: