如何在WPF的类文件中访问App.xaml中声明的Window对象？

Question

I have Window object in App.xaml.cs file which is public. Now, i want to access this window object in class file. Is it possible?

In App.xaml.cs file:

public partial class App : Application
    {
         public MyWindow mainWindowObj;

        void App_Startup(object sender, StartupEventArgs e)
        {
            mainWindowObj = new MyWindow();
            mainWindowObj.Show();
        }
    }

In Some Classfile.cs i want to access the 'mainWindowobj'. I have tried following in Classfile.cs but error:

((App)Application.Current).mainWindowObj.Title="Hello";

this above line is sample i want to access the variables,objects inside this forms.

Help Appreciated!

Answer 1

Converting my comment to an answer.

Namespace being used for Application appears to be System.Windows.Forms.Application rather than System.Windows.Application

fix : (be explicit if needed or get rid of the using System.Windows.Forms; which you probably have somewhere in that scope)

var currentApp = System.Windows.Application.Current as App;
if (currentApp != null)
  currentApp.mainWindowObj.Title = "Hello";