Call NotifyOfPropertyChange in a different thread?

Is it possible to call NotifyOfPropertyChange from a different thread?

I have a ViewModel class with a method called LoadData() which calls NotifyOfPropertyChange for all variables in that class.

I also have a class which uses C#s Timer class to run a background method every 1 minute which fetches new data from DB. This method calls the LoadData method in the ViewModel class. But it does not refresh the UI. Should the LoadData method be called only from the UI thread?

Here are my classes:

public class ShellViewModel : Conductor<object>
{
    public List<MyClass> AllData {get; set;}
    
    public void LoadData()
    {
        NotifyOfPropertyChange(() => AllData);
    }
}

My Timer Class

public class RecurringTasks : PropertyChangedBase
{
    //This method runs in a background thread
    private void UpdateData()
    {
        //Code to connect to DB and get data
        _shellViewModel.AllData = //assign data from DB
        _shellViewModel.LoadData();
}

Whenever the Timer runs the UpdateData() method, I see that the data in the “AllData” field ShellViewModel actually gets updated. But the UI is not changing.

[nigel-sampson]

That would work but could have side effects in other areas of your application.

I’m going to close this issue out as it’s definitely not a framework bug.

[gowthamnatarajan]

Thanks. Making all ViewModels as Singletons worked and there were no other issues in the application. Its because, I always though all ViewModels would be singleton by default and wrote code accordingly.