绑定节点

Question

我写了一个WPF活动库。在其中一个活动中，我使用TreeView在其中显示一些信息，如下所示:

...
<TreeView x:Name= "myTreeView" Grid.Row="0" FontFamily="Tahoma" FontSize="10">
                <TreeViewItem Header="Item 1">
                    <TreeViewItem Header="Item 11" >
                        <TreeViewItem Header="Item 111"/>
                        <TreeViewItem Header="Item 112" />
                    </TreeViewItem>
                    <TreeViewItem Header="Item 12" >
                        <TreeViewItem Header="Item 121" />
                        <TreeViewItem Header="Item 122" />
                        <TreeViewItem Header="Item 123" />
                    </TreeViewItem>
                    <TreeViewItem Header="Item 13" >
                        <TreeViewItem Header="Item 131" />
                        <TreeViewItem Header="Item 132" />
                    </TreeViewItem>
                </TreeViewItem>
            </TreeView>
...

我在Code-Activity中的属性是这样的:

public InArgument<TreeViewItem> Branch { 
        get{return _branch;} 
        set
        {
            if (this._branch != value)
            {
                this._branch = value;
                OnPropertyChanged("Branch");
            }
        } 
    }
    public event PropertyChangedEventHandler PropertyChanged;
    private void OnPropertyChanged(string propertyName)
    {
        if (this.PropertyChanged != null)
        {
            this.PropertyChanged(this, 
                            new PropertyChangedEventArgs(propertyName));
        }
    }

我需要当用户点击其中一个TreeView项目，我发送该项目到我的属性(我想把它绑定到分支属性)。我该怎么做呢?

Answer 1

不幸的是，你想要实现的目标并没有开箱操作。这里有一些不同的解决方法:WPF树视图中与SelectedItem的数据绑定

最简单的方法是设置一些CodeBehind:

XAML:

<TreeView SelectedItemChanged="myTreeView_SelectedItemChanged" 

代码:

private void myTreeView_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
{
  var treeViewItem = e.NewValue as TreeViewItem;
  (myTreeView.DataContext as MyViewModel).Branch = treeViewItem;
}