将 TreeViewItem 标记传递给事件处理程序 c#

Question

好的，下面是我目前尝试向自定义文件浏览器添加菜单的代码。现在我正在研究一个新的文件夹按钮，但最终想在菜单中添加更多项目。我的问题是如何将标签从项目传递到 Menu_MouseLeftClick 事件处理程序。在此先感谢您的帮助我是新人在此先感谢。

using System.Windows;
using System.Windows.Controls;
using System.IO;
using System.Collections.Generic;
using System;

namespace TreeViewWithMenu
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
    public MainWindow()
    {
        //Create Objects and Handlers
        InitializeComponent();
        PopTree();
        SetMenu();
        this.treeView.MouseRightButtonDown += TreeView_MouseRightButtonDown;
        this.menu.MouseLeftButtonDown += Menu_MouseLeftButtonDown;

    }

    private void TreeView_MouseRightButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
    { 
        //Make Folder Visable
        this.menu.Visibility = Visibility.Visible;
    }

    private void SetMenu()
    {
        //Set Menu for new Folder
        MenuItem MeItem = new MenuItem();
        MeItem.Header = "New Folder";
        MeItem.Tag = "New Folder";
        menu.Items.Add(MeItem);
        menu.Visibility = Visibility.Hidden;

    }

    private void Menu_MouseLeftButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
    {
        //Create New FOlder
        Directory.CreateDirectory("");
    }



    internal void PopTree()
    {
        //Populate Tree
        List<string> CleanDirs = new List<string>();

        string [] Dirs =  Directory.GetDirectories(Environment.GetFolderPath(Environment.SpecialFolder.Desktop));

        string temp;
        foreach (string dir in Dirs)
        { temp = SplitPath(dir); CleanDirs.Add(temp.ToUpper()); }

        foreach(var ShowIn in CleanDirs)
        {
            TreeViewItem TreeViewDirectory = new TreeViewItem();
            TreeViewDirectory.Tag = ShowIn;
            TreeViewDirectory.Header = ShowIn;
            TreeViewDirectory.Focusable = true;
            this.treeView.Items.Add(TreeViewDirectory);

        }

    }

    private string SplitPath(string path)
    {
        string[] temp = path.Split('\');

        return temp[temp.Length - 1];
    }
}

} `

Answer 1

使用 SelectedItem 属性从 TreeView 访问当前选择的项目，这应该与您右键单击的项目相同。

private void TreeView_MouseRightButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
    if (treeView.SelectedItem == null)
        return;

    var selectedTag = ((TreeViewItem)treeView.SelectedItem).Tag;

    // do something with the tag
}

Answer 2

不要手动添加控件 (TreeViewItem)。使用集合作为视图模型绑定到来自 treeView ItemsSource 属性的集合。使用 DataTemplate 将视图模型上的相关属性绑定到 TreeViewItem 控件上的依赖属性。

所有的羽化应该来自 Xaml 文件

将 TreeViewItem 标记传递给事件处理程序 c#

Pass TreeViewItem Tag to Event Handler c#

c#

wpf

treeview