c# event handler is called multiple times when event is raised once

Question

Below is my code, first is where I raise the event and second section is where I consume it in another class. It seems pretty straight forward, but the logs are showing that

Answer 1

I had the same problem, register your event in a synchronous method ( I put it in form_loaded)

    private async void Window_Loaded(object sender, RoutedEventArgs e)
    {
        RefreshHierarchy.COIDConflict += RefreshHierarchy_COIDConflict;
    }