UWP Cortana - 如何访问 MyClass.xaml.cs 中的方法？

Question

我正在为我的 UWP 应用程序使用 Cortana，它运行良好。 但是当我尝试调用不在 app.xaml.cs 中的方法时，我失败了。

我想做什么：

// Switch the content of my Frame (works so far)
Frame rootFrame = Window.Current.Content as Frame;
MainPage page = rootFrame.Content as MainPage;
// cframe references my XAML Frame in the MainPage
page.cframe.Navigate(typeof(MyClass));
// Now the content of the frame is changed and I want to call a method from
// MyClass.xaml.cs
MyClass p = rootFrame.Content as MyClass;
// Here I get a System.NullReferenceException when I try to call
// the "callWebservice()" method from MyClass.xaml.cs
p.callWebservice();

如何访问？

感谢您的帮助。

Answer 1

自己解决了：

Frame rootFrame = Window.Current.Content as Frame;
MainPage page = rootFrame.Content as MainPage;
page.cframe.Navigate(typeof(MyClass));
//the next line do the trick
MyClass p = page.cframe.Content as MyClass;
p.callWebservice();