/// <summary>
/// 窗口关闭事件的回调函数
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Window_Closed(object sender, System.EventArgs e)
{
//如果各子窗口实例存在，关掉这些子窗口
if (null != borrowWindow)
{
borrowWindow.Close();
}
if (null != returnWindow)
{
returnWindow.Close();
}
if (null != addStuffWindow)
{
addStuffWindow.Close();
}
if (null != removeStuffWindow)
{
removeStuffWindow.Close();
}
}