Question

我正在开发一个嵌套listbox的项目。内部列表框的ItemsSource引用其父列表框的ItemsSource中定义的collection of string。但是当我运行代码时，我无法在嵌套列表框中看到绑定数据。

我搜索了论坛并找到this和this解决方案，但我还无法解决问题。也许代码有问题。所以这是代码的样子：

<ListBox ItemsSource="{Binding Items}" Name="detailList" Margin="5,5,0,0">

    <ListBox.ItemTemplate >
        <DataTemplate>
            <StackPanel Orientation="Vertical" Width="90" Margin="5,0,0,0">
                <TextBlock Text="{Binding Name}" Width="60" Height="30" TextWrapping="Wrap" FontSize="11" TextAlignment="Center"/>
                <Expander Visibility="{Binding Visibility}" DockPanel.Dock="Top">

                    <ListBox ItemsSource="{Binding Path=SubFamiliesNames}">
                        <ListBox.ItemTemplate>
                            <DataTemplate>
                               <StackPanel>
                                  <TextBlock Text="{Binding}"/>
                               </StackPanel>
                            </DataTemplate>
                        </ListBox.ItemTemplate>
                    </ListBox>

                </Expander>
            </StackPanel>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

代码背后

public ObservableCollection<DirectoryItemViewModel> Items { get; set; }
public DefaultControl()
{
    InitializeComponent();
    Items = new ObservableCollection<DirectoryItemViewModel>
    {
        /*Some Initial Data*/
    };
    this.DataContext = Items;
}

DirectoryItemViewModel.cs

public class DirectoryItemViewModel : INotifyPropertyChanged 
{

    public event PropertyChangedEventHandler PropertyChanged;       
    protected void OnPropertyChanged(string propertyName)
    {
        PropertyChangedEventHandler handler = PropertyChanged;
        if (handler != null)
        {
            handler(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    // Constructor
    public DirectoryItemViewModel()
    {            
        //initialize some data          

        _subfamiliesnames = new ObservableCollection<string>();
        _subfamiliesnames.Add("File1");
        _subfamiliesnames.Add("File2");
        _subfamiliesnames.Add("File3");

    }

    #region Public Properties

    public ObservableCollection<string> _subfamiliesnames;        
    public ObservableCollection<string> SubFamiliesNames
    {
        get { return _subfamiliesnames; }
        set
        {
            _subfamiliesnames = value;
            OnPropertyChanged("SubFamiliesNames");
        }
    }

    // Full path of the directory
    public string FullPath { get; set; }

    // Item type (Enum)
    public DirectoryItemType Type { get; set; }  

    public string Visibility
    {
        get
        { 
           return "Visible";               
        }
    }

    //The name of the Directory
    public string Name { get { return this.Type == DirectoryItemType.Drive ? this.FullPath : DirectoryStructure.GetFileFolderName(FullPath); } }

    #endregion

}

请分享您的解决方案，非常感谢您的支持。谢谢。

Answer 1

在后面的代码中，数据上下文被指定为Items。因此，对于detailList的ItemSource，它将尝试在Items集合中查找Items的出现。

尝试在后面的代码中指定 this.DataContext = this; 。然后它会尝试找到＆＃39; Items＆＃39;在DefaultControl类中，将能够成功找到它。

如果仍未在列表视图中显示所需数据，请与我联系。

After modified code, the listbox shows data like following

WPF - 嵌套列表框绑定不起作用

1 个答案: