Can't use System.Windows.Application

Question

I was trying to add System.Windows.Application to my c# project and will gives me an error. please help me to figure it out.

 using System;
 using System.ComponentModel.Composition;
 using System.Threading;
 using System.Windows.Forms;
 **using Application = System.Windows.Application;**

 namespace DIPS.DocumentPublish.Admin.Helpers{
    public class DocumentPublishClientAdminNotificationService{
       public void Invoke(Action action)
       {
           if (action == null)
           {
               return;
           }

           if (IsInvokeRequired())
           {
               if (Application.Current?.Dispatcher != null)
               {
                   Application.Current?.Dispatcher?.Invoke(action);
                   return;
               }
           }
           action();
       }
    }
 }

error is The type or namespace name 'Application does not exist in the namespace 'System.Windows'(Are you missing an assembly reference?) cannot resolve 'Application'

Answer 1

You need to add a PresentationFramework reference in the project:

Feel free to let me know if the problem persists.

Answer 2

You can't use Application as the alias name, because it conflicts with the static class in the System namespace. Either use a different name ( App , etc) or remove the using statement for System.