wpf 列表为空时，按键不可用

using Prism.Commands;
using Prism.Mvvm;
using System.Collections.ObjectModel;

public class MyViewModel : BindableBase
{
    private ObservableCollection<string> _items;
    public ObservableCollection<string> Items
    {
        get => _items;
        set => SetProperty(ref _items, value);
    }

    public DelegateCommand MyCommand { get; private set; }

    public MyViewModel()
    {
        Items = new ObservableCollection<string>(); // 初始化列表
        MyCommand = new DelegateCommand(ExecuteMyCommand, CanExecuteMyCommand);

        // 当列表内容变化时，触发CanExecute条件的检查
        Items.CollectionChanged += (s, e) => MyCommand.RaiseCanExecuteChanged();
    }

    private void ExecuteMyCommand()
    {
        // 按钮点击时执行的操作
    }

    private bool CanExecuteMyCommand()
    {
        // 列表为空时，命令不可执行，按钮不可用
        return Items.Count > 0;
    }
}

<Button Content="My Button" Command="{Binding MyCommand}" />