WPF ItemsControl Command 绑定操作

视图模型：

using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Windows.Input;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;

public class MainWindowViewModel : ObservableObject
{
    public ObservableCollection<ItemViewModel> ItemsCollection { get; } = new();

    public MainWindowViewModel()
    {
        ItemsCollection.Add(new ItemViewModel());
        ItemsCollection.Add(new ItemViewModel());
        ItemsCollection.Add(new ItemViewModel());
    }

    public ICommand RemoveCommand => _removeCommand ??= new RelayCommand<ItemViewModel>(item => Remove(item));
    private RelayCommand<ItemViewModel>? _removeCommand;

    private void Remove(ItemViewModel? item)
    {
        if (item is not null)
        {
            Debug.WriteLine($"Checked:{item.Checked}");

            ItemsCollection.Remove(item);
        }
    }
}

窗口的视图。ItemsControl.ItemTemplate的DataTemplate元素与UserControl相同，但绑定已修改

<Window x:Class="WpfApp.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:WpfApp"
        Title="MainWindow"
        Width="600" Height="300">
    <Window.DataContext>
        <local:MainWindowViewModel/>
    </Window.DataContext>

    <ScrollViewer VerticalScrollBarVisibility="Visible">
        <ItemsControl ItemsSource="{Binding ItemsCollection}"
                      HorizontalAlignment="Stretch" VerticalAlignment="Top">
            <ItemsControl.ItemContainerStyle>
                <Style>
                    <Setter Property="FrameworkElement.Margin" Value="5,20,0,0"/>
                </Style>
            </ItemsControl.ItemContainerStyle>
            <ItemsControl.ItemTemplate>
                <DataTemplate>
                    <StackPanel>
                        <CheckBox IsChecked="{Binding Checked, Mode=OneWayToSource}"/>
                        <Button Content="X"
                                Command="{Binding DataContext.RemoveCommand, RelativeSource={RelativeSource FindAncestor, AncestorType=Window}}"
                                CommandParameter="{Binding DataContext, RelativeSource={RelativeSource Self}}"/>
                    </StackPanel>
                </DataTemplate>
            </ItemsControl.ItemTemplate>
        </ItemsControl>
    </ScrollViewer>
</Window>

Command的AncestorType要根据上下文具体而定