c# - WPF 绑定(bind) ObservableCollection<string> 到 ItemsControl 不起作用

Question

我有一些字符串属性，需要解析内容并将其显示在单独的控件中。假设有由空格分隔的电子邮件和网址。显示电子邮件工作正常，但网址不行。代码如下:

XAML 文件:

<ScrollViewer Grid.Row="0" Grid.Column="5" >
        <StackPanel Orientation="Vertical">
            <TextBox Name="EmailTextBox"
                     Text="{Binding ElementName=candidatePersonalDataViewControl, Mode=OneWay, Path=Candidate.Email, Converter={StaticResource emailConverter}}"/>

            <ItemsControl ItemsSource="{Binding ElementName=candidatePersonalDataViewControl, Mode=OneWay, Path=UrlsProperty}">
                <ItemsControl.ItemTemplate>
                    <DataTemplate>
                        <TextBlock
                            Margin="0,0,0,0"
                            Padding="5,2,5,2"
                            HorizontalAlignment="Left"
                            VerticalAlignment="Top">
                            <Hyperlink NavigateUri="{Binding Path=/}" 
                                       Click="EmailAsWWW_Click">
                                <Run Text="{Binding Path=/}" />
                            </Hyperlink>
                        </TextBlock>
                    </DataTemplate>
                </ItemsControl.ItemTemplate>
                <ItemsControl.ItemsPanel>
                    <ItemsPanelTemplate>
                        <VirtualizingStackPanel Orientation="Vertical" />
                    </ItemsPanelTemplate>
                </ItemsControl.ItemsPanel>
            </ItemsControl>
        </StackPanel>
    </ScrollViewer>

C# 文件:

    private static readonly DependencyProperty CandidateProperty = DependencyProperty.Register("Candidate", typeof(Candidate), typeof(CandidatePersonalDataViewControl));
    public Candidate Candidate
    {
        get { return (Candidate)GetValue(CandidateProperty); }
        set { SetValue(CandidateProperty, value); }
    }

    public CandidatePersonalDataViewControl()
    {
        InitializeComponent();
        this.DataContext = this;
        UrlsProperty = new ObservableCollection<string>();
    }

    public ObservableCollection<string> UrlsProperty
    {
        get;
        private set;
    }

    private void Grid_LayoutUpdated(object sender, EventArgs e)
    {
        if (Candidate == null)
            return;
        if (Candidate.Email == null)
            return;


        EmailPropertyToEmailsConverter emailConverter = new EmailPropertyToEmailsConverter();
        bool emails = (emailConverter.Convert(Candidate.Email, typeof(string), null, null) as string) != null;
        this.EmailTextBox.Visibility = emails ? Visibility.Visible : Visibility.Collapsed;

        EmailPropertyToUrlListConverter urlConverter = new EmailPropertyToUrlListConverter();
        IList<string> urls = urlConverter.Convert(Candidate.Email, typeof(string), null, null) as IList<string>;
        UrlsProperty.Clear();
        if (urls != null)
            foreach (string url in urls)
                UrlsProperty.Add(url);
    }

我已经调试了 Grid_LayoutUpdated 并且它工作正常。它会在需要时被触发，并且 UrlsCollection 包含所需的数据。正如我所说，EmailTextBox 显示数据，但 ItemsControl 始终为空。更有趣的是，从超链接绑定(bind)中删除“Path=/”会引发 XAML 解析异常。我已经没有想法了... 我读过一些主题，但没有一个有帮助

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Answer 1

Path=/ 绑定(bind)到集合的当前项目，而不是正在模板化的当前项目 ，通常表示当前项目是选定的项目(参见 IsSynchronizedWithCurrentItem )。您的 DataContext 是字符串而不是集合，因此尝试通过 / 绑定(bind)到当前项目将会失败(请参阅 binding errors )。

要绑定(bind)到正在模板化的当前项目，您需要直接绑定(bind)到DataContext，这可以通过{Binding}来完成或 {Binding .}/{Binding Path=.} (如果属性需要 Binding.Path，请选择后者之一)。