Question

我已根据以下文章实现了树视图的SelectedItem：Data binding to SelectedItem in a WPF Treeview

SelectedItem非常完美，它真实地反映了所选项目。

现在我想与所选项目互动，但我不确定如何。我可以创建一个BindableSelectedItemBehavior类的实例，但这不是包含我正在寻找的数据的实例。如何访问持有treeview的SelectedItem的类实例？
这是我的代码的一个亮点：

namespace QuickSlide_2._0
{
  public class BindableSelectedItemBehavior : Behavior<TreeView>
  {
  ...
  }

  public partial class Window1 : Window
  {
  .....
    private void New_subject_Click(object sender, RoutedEventArgs e)
    {
    // here the code to read the instance of the class BindableSelectedItemBehavior and interact  
    // with the selectedItem when I click on the button
    }
  }
}

也许我完全看错了方向。非常感谢您的帮助！

Answer 1

您希望使用MVVM，以便绑定行为的依赖项属性，然后您可以访问您所做的SelectedItem的值。

public class BindableSelectedItemBehavior : Behavior<TreeView>
{
     //Dependency property called SelectedTreeViewItem register it
}

public partial class Window1 : Window
{
     public Window1()
     {
       DataContext = new WindowViewModel();
     }

    private void New_subject_Click(object sender, RoutedEventArgs e)
    {
    // here the code to read the instance of the class BindableSelectedItemBehavior and interact  
    // with the selectedItem when I click on the button
       var windowViewModel = DataContext as WindowViewModel;
       var selectedItem = windowViewModel.SelectedItem;
    }
}

public class WindowViewModel()
{
      public object SelectedItem { get; set; } // You want to change object to the type you are expecting
}

和View

<TreeView>
  <TreeView.Behaviors>
       <BindableSelectedItemBehavior SelectedTreeViewItem="{Binding SelectedTreeViewItem,Mode=TwoWay}">
  </...>
</...>

与Treeview的SelectemItem交互

1 个答案: