XamlParseException在添加MenuItems時未處理

Question

在執行this question的答案時，我遇到了XamlParseException運行時錯誤。

我會解釋什麼時候發生錯誤，因爲它對我沒有任何意義。首先，我使用上一個問題的解決方案構建兩個Context Menus，當用戶右鍵單擊TreeViewitems時，該解決方案就會停止。

編輯：爲了更好地理解，我將發佈代碼，確切地說我有它。將代碼切換到此狀態後，我仍然收到錯誤消息。

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); 
} 

我添加兩個MenuItems就像這兩個TreeViewItems。如果我編譯和運行的第一套實施，程序運行良好，但在添加新的MenuItems到其他TreeViewItem後，我得到那XamlParseException was unhandled錯誤。什麼可能導致這個？

感謝您的幫助。

XAML按照要求

<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> 

我TreeView在XAML：

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

Answer 1

你的問題是在這條線：

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

這個變化是：

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

是否有可能重用這樣的代碼？

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：您將同時使用兩個ContextMenu。使用它並嘗試檢查哪個項目是發送活動的項目以刪除適當的項目;）