TreeView ItemsSource MVVM 绑定

Question

我有一个带有默认 treeviewitem 的 TreeView，另一个带有动态值。但是我没有 TreeViewItem 的名称，而是： https://gyazo.com/00563993faf7f5d59bb8ab6870fd428d

整行是："MyWindowsMediaPlayer.Model.PlaylistDB"

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");
            }
        }

并且在初始化时：

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。

像这样重写 PlaylistDB 的 ToString() 方法：

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

您也可以像这里描述的那样编辑您的 TreeView 资源： http://www.wpf-tutorial.com/treeview-control/treeview-data-binding-multiple-templates/

Answer 2

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

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

TreeView ItemsSource MVVM 绑定

TreeView ItemsSource MVVM Binding

c#

wpf

treeview

xaml

mvvm