如何获取上下文菜单项的父名称？

发布于 2024-10-18 16:55:13 字数 211 浏览 3 评论 0原文

我正在尝试获取上下文菜单项的父名称。

所以我在 menuItem_click 上尝试了类似的操作：

Button clikance = (Button)sender;
string ladyGaga = Convert.ToString(clikance.Content);

但它不起作用（无效的强制转换异常）。感谢您的帮助

原文

I'm trying to get the parent name of a context menu item.

So I tried something like this on menuItem_click :

Button clikance = (Button)sender;
string ladyGaga = Convert.ToString(clikance.Content);

But it didn't work (invalid cast exception). thx for any help

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我不在是我 2024-10-25 16:55:13

我使用了不同的方法来获取上下文菜单的发件人按钮。我在“hold_click”上做了一个事件

，我在公共字符串中取回了按钮的内容

private void GestureListener_DoubleTap(object sender, GestureEventArgs e)
{
    Button clikance = (Button)sender;
    ButtonEnvoyeur = Convert.ToString(clikance.Content);
}

i have use a different approach for getting the sender button of my context menu. i have made an event on the "hold_click"

where i have get back the content of the button in a public string

private void GestureListener_DoubleTap(object sender, GestureEventArgs e)
{
    Button clikance = (Button)sender;
    ButtonEnvoyeur = Convert.ToString(clikance.Content);
}

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还在原地等你 2024-10-25 16:55:13

如果您在引发异常的调试器中查看，您将看到 sender 不是 Button，因此尝试显式转换为 < code>Button 显然会抛出 InvalidCastException。

您可以使用 VisualTreeHelper 在树中从实际发件人向上走到 Button 元素：

VisualTreeHelper.GetParent((sender as DependencyObject));

UPDATE: 在您的实例中 sender< /strong> 是 ContextMenu 中的 MenuItem。您可以使用 VisualTreeHelper 从 MenuItem 访问父 ContextMenu，但不幸的是，ContextMenu 不会公开使您能够访问所有者的任何公共成员； Owner 属性是内部的。您可以获取 Toolkit 的源代码并将 Owner 属性公开为 publi，或者使用完全不同的方法。

您是否考虑过使用 MVVM 框架（例如 MVVM Light）将命令连接到这些上下文菜单项？您当前的方法非常脆弱，一旦您更改视觉树就会崩溃。如果您使用命令，则可以通过命令参数传递处理所需的任何附加信息。

If you look in the debugger at the point where the exception is raised, you'll see that sender isn't a Button, so trying to do an explicit cast to Button will obviously throw an InvalidCastException.

You can use the VisualTreeHelper to walk up the tree from your actual sender to the Button element:

VisualTreeHelper.GetParent((sender as DependencyObject));

UPDATE: In your instance sender is the MenuItem in the ContextMenu. You can get to the parent ContextMenu from the MenuItem by using the VisualTreeHelper, but unfortunately, ContextMenu does not expose any public members that enable you to access the owner; the Owner property is internal. You could get the source code for the Toolkit and expose the Owner property as publi instead, or use a completely different approach.

Have you thought of using an MVVM framework (such as MVVM Light) to wire up commands to these context menu items? Your current approach is very fragile and will break as soon as you change the visual tree. If you used commands, you could pass any additional information that you need for processing via the command parameter.

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爱的故事 2024-10-25 16:55:13

使用 MenuItem 的 Tag 属性来检索您的 Button ：

// Object creation
Button myButtonWithContextMenu = new Button();
ContextMenu contextMenu = new ContextMenu();
MenuItem aMenuItem = new MenuItem 
{
    Header = "some action",
    Tag = myButtonWithContextMenu, // tag contains the button
};

// Events handler
aMenuItem.Click += new RoutedEventHandler(itemClick);

private void itemClick(object sender, RoutedEventArgs e)
{
    // Sender is the MenuItem
    MenuItem menuItem = sender as MenuItem;

    // Retrieve button from tag
    Button myButtonWithContextMenu = menuItem.Tag as Button;
    (...)         
}

Alex。

Use the Tag property of the MenuItem to retrieve your Button :

// Object creation
Button myButtonWithContextMenu = new Button();
ContextMenu contextMenu = new ContextMenu();
MenuItem aMenuItem = new MenuItem 
{
    Header = "some action",
    Tag = myButtonWithContextMenu, // tag contains the button
};

// Events handler
aMenuItem.Click += new RoutedEventHandler(itemClick);

private void itemClick(object sender, RoutedEventArgs e)
{
    // Sender is the MenuItem
    MenuItem menuItem = sender as MenuItem;

    // Retrieve button from tag
    Button myButtonWithContextMenu = menuItem.Tag as Button;
    (...)         
}

Alex.

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