Question

在实施this question的答案时，我遇到了XamlParseException运行时错误。

我会解释错误发生的时间，因为它对我没有任何意义。首先，我使用上一个问题中的解决方案来构建两个Context Menus，当用户右键单击TreeViewitems时，该public static TreeViewItem item1 = new TreeViewItem(); public static TreeViewItem item2 = new TreeViewItem(); ContextMenu item1_CM = new ContextMenu() { Background = Brushes.White, BorderBrush = Brushes.Black, BorderThickness = new Thickness(1) }; MenuItem add1 = new MenuItem() { Header = "Add..." }; //Add & Delete MenuItems MenuItem delete1 = new MenuItem() { Header = "Delete..." }; ContextMenu item2_CM = new ContextMenu() { Background = Brushes.White, BorderBrush = Brushes.Black, BorderThickness = new Thickness(1) }; MenuItem add2 = new MenuItem() { Header = "Add..." }; //Add & Delete MenuItems MenuItem delete2 = new MenuItem() { Header = "Delete..." }; public constructor() { Tree = new ObservableCollection<TreeViewItem>(); Tree.Add(item1); Tree.Add(item2); //Add MenuItems to TreeView ContextMenus item1_CM.Items.Add(add1); item1_CM.Items.Add(delete1); item1.Items.Add(item1_CM); item2_CM.Items.Add(add2); item2_CM.Items.Add(delete2); item2.Items.Add(item2_CM); }会出现。{/ p>

编辑：为了更好地理解，我将准确地发布代码。将代码切换为此后，我仍然收到错误。

MenuItems

我为两个TreeViewItems添加了两个MenuItems。如果我编译并运行第一组实现，程序运行正常，但在将新TreeViewItem添加到另一个XamlParseException was unhandled后，我得到<Window x:Class="CircularButtonPrototype.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:sys="clr-namespace:System;assembly=mscorlib" xmlns:cmp="clr-namespace:System.ComponentModel;assembly=WindowsBase" Title="Window1" MinHeight="685" MaxHeight="685" Height="685" MinWidth="1044" MaxWidth="1044" Width="1044" AllowsTransparency="False" WindowStartupLocation="CenterScreen" WindowStyle="None" Visibility="Visible"> </Window>错误。可能导致这种情况的原因是什么？

感谢您的帮助。

XAML根据要求

TreeView

XAML中的<TreeView Name="Tree_One" ItemsSource="{Binding Tree}" HorizontalAlignment="Left" Background="White" SelectedItemChanged="Tree_One_SelectedItemChanged" />：

{{1}}

Answer 1

你的问题就在这一行：

 item1.Items.Add(item1_CM);
 ...
 item2.Items.Add(item2_CM);

由此改变：

item1.ContextMenu = item1_CM;
...
item2.ContextMenu = item2_CM;

是否可以重复使用这样的代码？

    public ObservableCollection<TreeViewItem> Tree { get; set; }

    public static TreeViewItem Item = new TreeViewItem {Header = "MainTreeViewItem"};
    public static TreeViewItem Item2 = new TreeViewItem {Header = "MainTreeViewItem"};

    ContextMenu contextMenu = new ContextMenu { Background = Brushes.White, BorderBrush = Brushes.Black, BorderThickness = new Thickness(1) };
    MenuItem addItem = new MenuItem() { Header = "Add..." }; //Add & Delete MenuItems
    MenuItem deleteItem = new MenuItem() { Header = "Delete..." };

    public MainWindow()
    {
        Tree = new ObservableCollection<TreeViewItem>();
        //Add MenuItems to TreeView ContextMenus
        contextMenu.Items.Add(addItem);
        contextMenu.Items.Add(deleteItem);

        Item.ContextMenu = contextMenu;
        Item2.ContextMenu = contextMenu;

        Tree.Add(Item);
        Tree.Add(Item2);
    }

注意：两者都使用相同的ContextMenu。使用它并尝试检查哪个项目是发送事件的项目以删除适当的项目;）

添加MenuItems时，XamlParseException未处理

1 个答案: