1

我正在开发一个 Windows 商店应用程序。

我有

class User
{
    public string Login { get; set; }
    public string Name { get; set; }
    public string Enabled { get; set; }

    public User(string Login)
    {
        this.Login = Login;
        this.Load();
    }

    async public Task Load()
    {
        HttpResponseMessage response = await App.http.GetAsync("https://example.com/user?login=" + Login);
        var xml = XDocument.Parse(await response.Content.ReadAsStringAsync());
        var user = (from entry in xml.Descendants("user")
                        select new
                        {
                            Name       = (string)entry.Element("name"),
                            Enabled    = (string)entry.Element("enabled")
                        }).First();
        this.Name = user.Name;
        this.Enabled = user.Enabled;
    }
}

描述用户并从服务器异步加载所有数据。我也有 MainPage.xaml，后面有以下代码：

public sealed partial class MainPage : Mail.Common.LayoutAwarePage
{        
    ObservableCollection<User> Users = new ObservableCollection<User>();

    public MainPage()
    {
        this.InitializeComponent();            
        itemListView.ItemsSource = Users;
    }

    private async void pageRoot_Loaded(object sender, RoutedEventArgs e)
    {
        HttpResponseMessage response = await App.http.GetAsync("https://example.com/listusers");
        var xml = XDocument.Parse(await response.Content.ReadAsStringAsync());
        foreach (var item in from entry in xml.Descendants("email")
                             select new
                             {
                                 Login = (string)entry.Element("name")
                             })
        {
            Users.Add(new User(item.Login));
        }
    }
}

MainPage有一个ListView显示ObservableCollection<User> Users。（我的 DataTemplate 看起来像：

        <DataTemplate x:Key="UserTemplate">
        <StackPanel Orientation="Horizontal" Width="470" Height="85">
            <Border Height="40" Width="40" Margin="10,10,0,10" VerticalAlignment="Top">
                <Image Source="/SampleImage.png" Stretch="UniformToFill"/>
            </Border>
            <StackPanel Orientation="Vertical" VerticalAlignment="Top" Margin="0,10,0,0">
                <TextBlock Text="{Binding Login}" FontSize="20" FontWeight="Semilight" 
                   Margin="10,0,0,0" Width="320" Height="26" TextTrimming="WordEllipsis" 
                   HorizontalAlignment="Left" VerticalAlignment="Top"/>
                <TextBlock Text="{Binding Name}" 
                   Margin="10,2,0,0" Width="320" TextTrimming="WordEllipsis" TextWrapping="Wrap" 
                   HorizontalAlignment="Left"/>
            </StackPanel>
            <TextBlock Text="{Binding Enabled}" FontSize="16" Margin="20,0,0,0" VerticalAlignment="Center"/>
        </StackPanel>
    </DataTemplate>

）。

不幸的是，我在 list 中只看到初始数据（登录）。name在构造函数（ , ）中异步接收的所有其他数据enabled未显示在listview（我确定，它已正确加载）中。

如何ListView显示集合中对象的实际状态Users？或者我应该执行同步请求（如何？）

4

1 回答 1

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Your User class must implement INotifyPropertyChanged and raise property change notifications properly.

-HighCore

(This question needed an answer to be appropriately marked as "answered".)

于 2014-03-07T18:43:33.277 回答