将 ContextMenu 项动态绑定到静态定义的 MenuItems [英] Dynamically binding ContextMenu items to statically defined MenuItems

问题描述

我的应用程序包含一个 TreeView，它支持一组命令，但命令可能会在菜单之间移动，只出现在某些菜单上而不出现在其他菜单上，在多个菜单之间共享等.

我知道我在编译时支持的所有命令的集合，所以理论上我可以定义一个带有 x:Key 属性的 资源它们都在我的 部分.但是，对于单击的任何给定节点，出现的菜单项只能在运行时确定.我可以将 ContextMenu.ItemsSource 绑定到我的应用程序中返回 MenuItem[] 的东西，但是为了构建这个数组，我需要访问在 XAML 文件中静态定义.

我做错了吗?或者有没有办法做我想做的事?

解决方案

绑定你的 ContextMenu.ItemsSource 不是 MenuItem[] 而是 ObservableCollection

你的菜单类 >.YourMenuClass 应该包含您想要绑定到的标题和其他参数，可能是一个命令.然后使用模板生成您的菜单项.

 <ContextMenu.ItemTemplate><数据模板><MenuItem Header="{Binding Path=Name}" Command="{Binding MyCommand}"/></数据模板></ContextMenu.ItemTemplate></ContextMenu>

My application contains a TreeView which supports a set of commands, but the commands might move around between menus, only appear on some menus and not others, be shared across multiple menus, etc.

I know the set of all commands that I support at compile time, so in theory I can define a <MenuItem> resource with an x:Key attribute for each of them in my <TreeView.Resources> section. However, for any given node that is clicked, which menu items that appear can only be determined at runtime. I can bind ContextMenu.ItemsSource to something in my application that returns a MenuItem[], but in order to build this array, I would then need to access the MenuItems that were defined statically back in the XAML file.

Am I doing this all wrong? Or is there a way to do what I want?

解决方案

Bind your ContextMenu.ItemsSource not to a MenuItem[] but a ObservableCollection < YourMenuClass >. YourMenuClass should contain the header and other parameters you want to bind to, maybe a command. Then use a template to generate your menuitems.

   <ContextMenu ItemsSource="{Binding MenuItemList}">
            <ContextMenu.ItemTemplate>
                <DataTemplate>
                    <MenuItem Header="{Binding Path=Name}" Command="{Binding MyCommand}" />
                </DataTemplate>
            </ContextMenu.ItemTemplate>
    </ContextMenu>

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