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对象的银色绑定

silverlight-4.0 data-binding

1

profanis · 技术社区 · 16 年前

在这个对象中存在另一个名为{User}的对象,我正在尝试将属性{Username}绑定到一个textBlock上。

<TextBlock x:Name="usernamtTBL" Text="{Binding 'User.Username'}"/>

这是listbox的完整XAML代码

<ListBox Height="275" x:Name="NewsFeedLB" Canvas.Left="8" Canvas.Top="8" Width="427" Background="White">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <Canvas Height="57" Width="265" d:DesignWidth="265" d:DesignHeight="155">
                <Border BorderBrush="Black" BorderThickness="1" Height="35" Canvas.Left="8" Canvas.Top="8" Width="48">
                    <Image x:Name="thumbIMG" Margin="7"/>
                </Border>
                <TextBlock x:Name="usernamtTBL" Text="{Binding 'User.Username'}" Height="12" Canvas.Left="71" TextWrapping="Wrap" Canvas.Top="8" Width="180"/>
                <TextBlock x:Name="statusTBL" Text="{Binding 'Text'}" Height="12" Canvas.Left="71" TextWrapping="Wrap" Canvas.Top="24" Width="180"/>
            </Canvas>                       
        </DataTemplate>         
    </ListBox.ItemTemplate> 
</ListBox>

private void MainPage_Loaded(object sender, System.Windows.RoutedEventArgs e) {
    var newsFeedWcfClient = new NewsFeedWCFClient();
    newsFeedWcfClient.GetNewsFeedItemsCompleted += new EventHandler<GetNewsFeedItemsCompletedEventArgs>(newsFeedWcfClient_GetNewsFeedItemsCompleted);
    newsFeedWcfClient.GetNewsFeedItemsAsync();
}

void newsFeedWcfClient_GetNewsFeedItemsCompleted(object sender, GetNewsFeedItemsCompletedEventArgs e) {
    var source = (IList<NewsFeed>)e.Result;
    NewsFeedLB.ItemsSource = source;
}

谢谢

1 回复 | 直到 16 年前

1

0

JSprang 16 年前

您的NewsFeed对象上是否有公共“get”,以便可以将该值绑定到?我复制了您的代码,如下所示(除了我简单地将源代码设置为ObservableCollection,并且没有调用服务),它工作了。

public partial class MainPage : UserControl
{
    public MainPage()
    {
        InitializeComponent();

        ObservableCollection<NewsFeed> source = new ObservableCollection<NewsFeed>() { new NewsFeed() { Text = "This is a test", User = new User(){Username="Test Name"} } };
        NewsFeedLB.ItemsSource = source;
    }
}

public class NewsFeed
{
    public string Text { get; set; }
    public User User { get; set; }
}

public class User
{
    public string Username { get; set; }
}