【demo】:
ZZSZYFP : UserControl, INavigateMdiControl
(1)继承自UserControl,并实现了 INavigateMdiControl接口
(2)限制表达式为:where T : UserControl, INavigateMdiControl
【demo】:
ZZSZYFP : UserControl, INavigateMdiControl
(1)继承自UserControl,并实现了 INavigateMdiControl接口
(2)限制表达式为:where T : UserControl, INavigateMdiControl