CODEWITHSUNDEEP
c#wpfuser-controlsapp.xaml
Ashish-BeJovial
Ashish-BeJovial

Reputation: 1867

Applicaiton object is coming null in ViewModel in wpf, trying to access Application variables

I am working on WPF application which contains two usercontrols, i am trying to set a Application variable and assigning some value at viewModel loads. This viewmodel is bind with my UserControl.

Question is how can i get and set the APplication variables in wpf. Whatever i have tried i am writing below.

App.xaml.cs

public string globalText = "";
public bool isNewUser;
public App()
{
    isNewUser = true;
}


MyViewModel.cs

App currentApp = Application.Current.Windows.OfType<App>().FirstOrDefault();

or

App currentApp = (App)System.Windows.Application.Current;

Above both ways i have tried but in both ways i am getting CurrentApp null.

i tried to add some value as below.

if(currentApp.IsNewUser)
{
   CurrentApp1.globalText = "Hello World";
}

Upvotes: 1

Views: 666

Answers (1)

mm8
mm8

Reputation: 169340

I am getting exception System.InvalidCastException: 'Unable to cast object of type 'SecondProject.App' to type 'FirstProject.App'.' While syntax App thisApp = ((App)Application.Current); is written in FirstProject.

If you have two App classes in scope you could reference the correct one using its fully qualifed type name:

App thisApp = (FirstProject.App)Application.Current;

Upvotes: 1

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