怎么样，是我的WinForm的应用程序的主窗口中我可以告诉大家，如果有属于主窗体的任何模态窗口/对话框打开？

 如果（THIS.VISIBLE＆安培;＆安培;！this.CanFocus）
{
    //模式子窗口打开
}
 

How, being inside the main form of my WinForm app can I tell if there are any modal windows/dialogs open that belong to the main form?

if (this.Visible && !this.CanFocus)
{
    // modal child windows are open
}