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WPF根据对象属性隐藏ContextMenu上的MenuItem

发布于 2024-07-19 04:18:12 字数 33 浏览 6 评论 0原文

我需要以编程方式显示/隐藏菜单项，最好的方法是什么？

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雨落□心尘 2024-07-26 04:18:12

好吧，要添加一个 MenuItem，您将需要以下内容：（

var menuItem = new MenuItem() { Header = "Menu Name", Name = "Identifier", IsCheckable = true, IsChecked = visible };
menuItem.Click += new RoutedEventHandler(contextMenu_onClick);
int position = contextMenu.Items.Add(menuItem);

但您可能已经有了这个）。

您将需要某种方法将菜单项绑定到属性 - 但如果没有看到您的应用程序，我无法真正建议最好的方法。 Tag 属性存储一个对象；存储字符串的 Uid 属性； Name 属性也存储一个字符串。

While：

menuItem.Visibility = Visibility.Visible;

并且

menuItem.Visibility = Visibility.Collapsed;

应该切换项目的可见性。

编辑：使用折叠将隐藏菜单项，并且不会在菜单中保留空间 - 您实际上并不希望上下文菜单中存在空白。 （感谢 Botz3000）

然后，在更改属性值的代码中，您将使用我上面描述的链接找到您希望显示/隐藏的菜单项。获得该物品后，您可以更改其价值：

menuItem.Visibility = menuItem.Visibility == Visibility.Visible ? Visibility.Collapsed : Visibility.Visible;

Well, to add a MenuItem you'll need something along these lines:

var menuItem = new MenuItem() { Header = "Menu Name", Name = "Identifier", IsCheckable = true, IsChecked = visible };
menuItem.Click += new RoutedEventHandler(contextMenu_onClick);
int position = contextMenu.Items.Add(menuItem);

(but you've probably already got this).

You will need some way of tying the menu item to the property - but without seeing your application I can't really suggest the best way. There's the Tag property which stores an object; the Uid property which stores a string; the Name property which also stores a string.

While:

menuItem.Visibility = Visibility.Visible;

and

menuItem.Visibility = Visibility.Collapsed;

should toggle the visibility of the item.

EDIT: Using Collapsed will hide the menu item and not reserve space in the menu - you don't really want blank spaces in a context menu. (thanks to Botz3000 for this)

Then in your code where the property value is changed you'll to find the menu item you wish to show/hide using the linkage I described above. Once you have the item you can switch it's value:

menuItem.Visibility = menuItem.Visibility == Visibility.Visible ? Visibility.Collapsed : Visibility.Visible;

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玉环 2024-07-26 04:18:12

您确定要隐藏 MenuItem 吗？更常见的是使用 WPF 的命令框架禁用它：

<MenuItem Header="_MenuName" Command="{x:Static local:MyCommands.SomeCommand}" />

...

<!-- In the menu item or any of its ancestors: -->
<SomeControl.CommandBindings>
    <CommandBinding Command="{x:Static local:MyCommands.SomeCommand}" Executed="Save_Executed" CanExecute="Save_CanExecture" />
</SomeControl.CommandBindings>

WPF 将使用 Save_CanExecute 的 bool 结果来确定 MenuItem 的命令是否有效当前可以执行，并相应地启用/禁用 MenuItem。

Are you sure you want to hide the MenuItem? It is more common to disable it, using WPF's commanding framework:

<MenuItem Header="_MenuName" Command="{x:Static local:MyCommands.SomeCommand}" />

...

<!-- In the menu item or any of its ancestors: -->
<SomeControl.CommandBindings>
    <CommandBinding Command="{x:Static local:MyCommands.SomeCommand}" Executed="Save_Executed" CanExecute="Save_CanExecture" />
</SomeControl.CommandBindings>

WPF will use the bool result of Save_CanExecute to determine whether the MenuItem's command can currently execute, and enable/disable the MenuItem accordingly.

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