TreeViewItem.HeaderTemplate和在树上移动

Question

那里

这是我后面的代码，可能看起来有点奇怪

class DataContext
    {
        ObservableCollection<TreeViewItem> itemsSource;
        public ObservableCollection<TreeViewItem> ItemsSource
        {
            get { return this.itemsSource; }
            set { this.itemsSource = value; }
        }
    }

        ObservableCollection<TreeViewItem> items = new ObservableCollection<TreeViewItem>();

        items.Add(new TreeViewItem());
        DataContext dcs = new DataContext();
        dcs.ItemsSource = new ObservableCollection<TreeViewItem>();

        dcs.ItemsSource.Add(new TreeViewItem());
        dcs.ItemsSource[dcs.ItemsSource.Count - 1] = null;
        dcs.ItemsSource.Add(new TreeViewItem());
        dcs.ItemsSource[dcs.ItemsSource.Count - 1] = null;
        dcs.ItemsSource.Add(new TreeViewItem());
        dcs.ItemsSource[dcs.ItemsSource.Count - 1] = null;
        dcs.ItemsSource.Add(new TreeViewItem());
        dcs.ItemsSource[dcs.ItemsSource.Count - 1] = null;
        dcs.ItemsSource.Add(new TreeViewItem());
        dcs.ItemsSource[dcs.ItemsSource.Count - 1] = null;
        dcs.ItemsSource.Add(new TreeViewItem());
        dcs.ItemsSource[dcs.ItemsSource.Count - 1] = null;


        items[items.Count - 1].DataContext = dcs;

        items.Add(new TreeViewItem());
        items[items.Count - 1].DataContext = null;
        items.Add(new TreeViewItem());
        items[items.Count - 1].DataContext = null;
        items.Add(new TreeViewItem());
        items[items.Count - 1].DataContext = null;
        items.Add(new TreeViewItem());
        items[items.Count - 1].DataContext = null;
        items.Add(new TreeViewItem());
        items[items.Count - 1].DataContext = null;
        items.Add(new TreeViewItem());
        items[items.Count - 1].DataContext = null;
        items.Add(new TreeViewItem());
        items[items.Count - 1].DataContext = null;
        items.Add(new TreeViewItem());
        items[items.Count - 1].DataContext = null;



        DataContext dc = new DataContext();
        dc.ItemsSource = items;

        MyTreeView.DataContext = dc;

我的xaml中有以下代码

<TreeView x:Name="MyTreeView" Margin="0" ItemsSource="{Binding ItemsSource}">
        <TreeView.Resources>
            <Style TargetType="TreeViewItem">
                <Setter Property="HeaderTemplate">
                    <Setter.Value>
                        <DataTemplate>
                            <StackPanel Orientation="Horizontal">
                                <CheckBox IsChecked="True" Focusable="False"/>
                                <TextBlock Text="Text"/>
                            </StackPanel>
                        </DataTemplate>
                    </Setter.Value>
                </Setter>
                <Setter Property="ItemsSource" Value="{Binding ItemsSource}"/>
                <Setter Property="IsExpanded" Value="True"/>
            </Style>
        </TreeView.Resources>
    </TreeView>

TreeViewItem子节点有问题，我不能使用向上和向下箭头在它们之间移动。请告诉我我该怎么做。提前谢谢。

Answer 1

为了解决您的问题，代码中的TreeViewItems应该直接添加到Items属性中。大概是这样的：

TreeViewItem treeViewItem = new TreeViewItem();
treeViewItem.Items.Add(new TreeViewItem());
treeViewItem.Items.Add(new TreeViewItem());
treeViewItem.Items.Add(new TreeViewItem());

MyTreeView.Items.Add(new TreeViewItem());
MyTreeView.Items.Add(treeViewItem);
MyTreeView.Items.Add(new TreeViewItem());

无论如何，我建议你深入了解WPF是如何工作的，并彻底修改你的代码。您可以从here和here开始。