WPF命令好状态刷新机制
https://blog.csdn.net/WPwalter/article/details/90344470
this.DispatcherInvoke(() =>
{
System.Windows.Input.CommandManager.InvalidateRequerySuggested();
});
https://blog.csdn.net/WPwalter/article/details/90344470
this.DispatcherInvoke(() =>
{
System.Windows.Input.CommandManager.InvalidateRequerySuggested();
});