

public class FrameworkApplication : System.Windows.Application, System.Windows.Markup.IQueryAmbient
Public Class FrameworkApplication Inherits System.Windows.Application Implements System.Windows.Markup.IQueryAmbient
The FrameworkApplication object is the central object in the Framework API. Its main purpose is to pull together all of the extensions and add-ins into one application. The FrameworkApplication encapsulates application-specific functionality, including the following::
The FrameworkApplication class follows the singleton pattern to provide easy access to its functionality.
System.Object
   System.Windows.Threading.DispatcherObject
      System.Windows.Application
         ArcGIS.Desktop.Framework.FrameworkApplication
            ArcGIS.Desktop.Core.Licensing.LicensedApplication
Target Platforms: Windows 10, Windows 8.1