Xamarin -如何知道在收藏视图中点击了什么？

<CollectionView ItemsSource="{Binding MyItems}" SelectedItem="{Binding SelectedItem}" 
                SelectionMode="Single" SelectionChangedCommand="{Binding ItemSelectedCommand}">
    <CollectionView.ItemTemplate>
        <DataTemplate>
            <!-- 设置项目的样式 -->
        </DataTemplate>
    </CollectionView.ItemTemplate>
</CollectionView>

private Command<object> _itemSelectedCommand;
public Command<object> ItemSelectedCommand
{
    get
    {
        if (_itemSelectedCommand == null)
        {
            _itemSelectedCommand = new Command<object>(OnItemSelected);
        }
        return _itemSelectedCommand;
    }
}

private void OnItemSelected(object selectedItem)
{
    // 处理选中项目的逻辑
}