WPF：更改上下文菜单上菜单项的文本

发布于 2024-08-18 16:34:43 字数 537 浏览 6 评论 0原文

我在 XAML 中有 ContextMenu ，并具有以下 MenuItem：

<MenuItem  Command="local:MyClass.MyCommand" "/>

我想以某种方式更改 MenuItem 的 Header更改 RoatedCommand 的 Text。我想在 CanExecuteRoulatedEventHanlder 中执行此操作。如果我只是更改 RoatedCommand Text，MenuItem 不会更新，我认为这是因为菜单在 时已经创建>CanExecuteRoatedEventHanlder 运行。

基本上我需要一种方法来强制从 Command 更新到 MenuItem。

原文

I have ContextMenu in XAML with the following MenuItem:

<MenuItem  Command="local:MyClass.MyCommand" "/>

I'd like to change the Header of MenuItem by somehow changing the Text of RoutedCommand. And I'd like to do that in CanExecuteRoutedEventHanlder. If I just change the RoutedCommand Text, MenuItems don't get updated, I assume that is because the menu is already created when CanExecuteRoutedEventHanlder is run.

Basically I need a method to force update from Command to MenuItem.

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度的依靠╰つ 2024-08-25 16:34:43

创建您自己的命令：

 public class MyCommandClass : ICommand, INotifyPropertyChanged
{
    public string Text { get; set; }

    public MyCommandClass(string text)
    {
        this.Text = text;
    }

    public bool CanExecute(object parameter)
    {
        this.Text = "changed the text";
        PropertyChanged.Invoke(this, new PropertyChangedEventArgs("Text"));
        return true;
    }

    public event EventHandler CanExecuteChanged;

    public void Execute(object parameter)
    {

    }

    public event PropertyChangedEventHandler PropertyChanged;
}

然后在 xaml 中将 Header 绑定到 MyCommandClass 的 Text 属性。

Make your own command:

 public class MyCommandClass : ICommand, INotifyPropertyChanged
{
    public string Text { get; set; }

    public MyCommandClass(string text)
    {
        this.Text = text;
    }

    public bool CanExecute(object parameter)
    {
        this.Text = "changed the text";
        PropertyChanged.Invoke(this, new PropertyChangedEventArgs("Text"));
        return true;
    }

    public event EventHandler CanExecuteChanged;

    public void Execute(object parameter)
    {

    }

    public event PropertyChangedEventHandler PropertyChanged;
}

Then in xaml bind the Header to the MyCommandClass's Text property.

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