在DataTemplate中绑定ListView的SelectedItem

<ListView ItemsSource="{Binding Items}">
    <ListView.ItemTemplate>
        <DataTemplate>
            <!-- 定义列表项的显示方式 -->
        </DataTemplate>
    </ListView.ItemTemplate>
</ListView>

<ListView ItemsSource="{Binding Items}"
          SelectedItem="{Binding SelectedItem}">
    <!-- 省略ItemTemplate的定义 -->
</ListView>

private object _selectedItem;
public object SelectedItem
{
    get { return _selectedItem; }
    set
    {
        if (_selectedItem != value)
        {
            _selectedItem = value;
            OnPropertyChanged(nameof(SelectedItem));
        }
    }
}

private void OnSelectedItemChanged()
{
    // 处理选中项变化的逻辑
}