无法从listview WPF中的选定项目获取值

<ListView x:Name="myListView" SelectionMode="Single" SelectedItems="{Binding SelectedItems}">
    <!-- ListView的其他设置 -->
</ListView>

private object _selectedItems;
public object SelectedItems
{
    get { return _selectedItems; }
    set
    {
        _selectedItems = value;
        OnPropertyChanged(nameof(SelectedItems));
    }
}

public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
    PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}

private void Button_Click(object sender, RoutedEventArgs e)
{
    var selectedItem = myListView.SelectedItems;
    // 使用选定项目的值进行后续操作
}