为什么e.Source依赖于TreeView的填充方法？ [英] Why e.Source depends on TreeView populating method?

问题描述

我有两棵树：

1. fooTree - 由元素组成，


2. barTree - 由

这两个树都有MouseRightButtonDown事件，但e.Source类型不同：

Both trees have MouseRightButtonDown event, but the e.Source type differs:

1. fooTree - System.Windows.Controls.TreeViewItem


2. barTree - System.Windows.Controls.TreeView

为什么e.Source有所不同？另外，如何获取barTree的点击的项目？

Why e.Source differs? Also, how can I get the clicked item for the barTree?

标记：

    <TreeView Name="fooTree" MouseRightButtonDown="fooTree_MouseDown">
        <TreeViewItem Header="foo"></TreeViewItem>
        <TreeViewItem Header="foo"></TreeViewItem>
    </TreeView>

    <TreeView Name="barTree" MouseRightButtonDown="barTree_MouseDown" ItemsSource="{Binding BarItems}">
        <TreeView.ItemTemplate>
            <HierarchicalDataTemplate>
                <TextBlock Text="{Binding}" />
            </HierarchicalDataTemplate>
        </TreeView.ItemTemplate>
    </TreeView>

代码：

public partial class Window1 : Window
{
    public Window1()
    {
        InitializeComponent();
        this.DataContext = this;
    }

    public string[] BarItems
    {
        get { return new string[] { "bar", "bar" }; }
    }

    private void barTree_MouseDown(object sender, MouseButtonEventArgs e) 
    {
    }

    private void fooTree_MouseDown(object sender, MouseButtonEventArgs e) 
    {
    }
}

推荐答案

不知道为什么会发生这种情况，但至少我找到了一个解决方案：

Don't know why this happens, but at least I have found a solution:

http://social.msdn.microsoft.com/Forums/en-US/ wpf / thread / f0d3af69-6ecc-4ddb-9526-588b72d5196b /

1. 如果您的处理程序在TreeView上，请使用
   事件参数中的OriginalSource属性，并向上走视觉
   父链，直到找到
   TreeViewItem。然后选择它。您可以
   通过使用
   System.Windows.Media.VisualTreeHelper.GetParent来执行视觉父链。

1. If your handler is on the TreeView, use the OriginalSource property in the event arguments and walk up the visual parent chain until you find a TreeViewItem. Then, select it. You can walk the visual parent chain by using System.Windows.Media.VisualTreeHelper.GetParent.

您可以尝试注册一个类型为TreeViewItem的类处理程序和
鼠标下拉事件。然后，您的处理程序
只应在鼠标
事件通过TreeViewItem
元素时调用。

You could try registering a class handler for type TreeViewItem and the mouse down event. Then, your handler should only be called when mouse events pass through TreeViewItem elements.

您可以注册一个类型TreeViewItem的类处理程序和上下文
菜单打开事件。

You could register a class handler for type TreeViewItem and the context menu opening event.

所以我的代码是：

private void OnMouseRightButtonDown(object sender, MouseButtonEventArgs e)
{
    TreeViewItem treeViewItem = VisualUpwardSearch<TreeViewItem>(e.OriginalSource as DependencyObject) as TreeViewItem;
}

static DependencyObject VisualUpwardSearch<T>(DependencyObject source)
{
    while (source != null && source.GetType() != typeof(T))
        source = VisualTreeHelper.GetParent(source);

    return source;
}

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