Question

我有一个默认的treeviewitem TreeView，另一个有dynaic值。但不是拥有TreeViewItem的名称，我有： https://gyazo.com/00563993faf7f5d59bb8ab6870fd428d

整行是：＆＃34; MyWindowsMediaPlayer.Model.PlaylistDB＆＃34;

XAML：

<TreeView Grid.Row="0" Grid.Column="0" HorizontalAlignment="Left" VerticalAlignment="Top" Width="135">
            <TreeViewItem Header="Bibliotheque" IsExpanded="True">
                <TreeViewItem Header="Mes Musiques" IsSelected="True"></TreeViewItem>
                <TreeViewItem Header="Mes Videos"></TreeViewItem>
                <TreeViewItem Header="Mes Images"></TreeViewItem>
            </TreeViewItem>
            <TreeViewItem Header="Lecteur"></TreeViewItem>
            <TreeViewItem Header="Playlist" ItemsSource="{Binding ItemSourceTree}">
            </TreeViewItem>
        </TreeView>

CS：

private ObservableCollection<PlaylistDB> _itemSourceTree;
public ObservableCollection<PlaylistDB> ItemSourceTree
        {
            get { return this._itemSourceTree; }
            set
            {
                this._itemSourceTree = value;
                this.OnPropertyChanged("ItemSourceTree");
            }
        }

在初始化时：

this.ItemSourceTree.Add(new PlaylistDB() { NamePlaylist = "I'm a test" });
this.ItemSourceTree.Add(new PlaylistDB() { NamePlaylist = "I'm a test 2 " });

Answer 1

您的树视图不知道如何显示PlaylistDB对象。

覆盖PlaylistDB的ToString（）Methode，如下所示：

public override string ToString()
{
  return "NameOfElement";
}

您也可以编辑TreeView资源，如下所述： http://www.wpf-tutorial.com/treeview-control/treeview-data-binding-multiple-templates/

Answer 2

您必须在DataTemplate资源下定义TreeView，以定义UI应如何呈现TreeViewItem绑定ViewModel的模板。

 <DataTemplate DataType="{x:Type local:PlaylistDB}">
          <StackPanel Orientation="Horizontal">
             <TextBlock Text="{Binding NamePlaylist }" />
          </StackPanel>
 </DataTemplate>

TreeView ItemsSource MVVM绑定

2 个答案: