更改功能区选项卡名称会引发异常

Question

我试图像这样更改标签名称：

foreach (Window window in Application.Current.Windows)
{
  (window as MainWindow).HomeTab.Header = "Teaching Learning Based Optimization";
}

但是我得到的只是一个NullReferenceException。我错过了什么？

Answer 1

P.S。解决了！这样做了：

if (window.GetType() == typeof(MainWindow))
{
  //Code
}

感谢您的建议。

Answer 2

处的空检查

(window as MainWindow)