assets/samples/Samples/ExternalResourceServer/ExternalResourceDBServer/CS/Application.cs

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using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.IO;

using Autodesk;
using Autodesk.Revit;
using Autodesk.Revit.DB;
using Autodesk.Revit.DB.ExternalService;
using Autodesk.Revit.ApplicationServices;

namespace Revit.SDK.Samples.ExternalResourceDBServer.CS
{
   /// <summary>
   /// <para>Implements the Revit add-in interface IExternalDBApplication.</para>
   /// <para>An IExternalResourceServer can be registered at any time during a Revit session.
   /// However, the most straightforward approach is to register during start-up, in the
   /// OnStartUp method of a Revit external application.  Since IExternalResourceServers
   /// do not implement any UI directly, they can be registered in a DB-only context,
   /// using an IExternalDBApplication.</para>
   /// </summary>
   public class DBApplication : IExternalDBApplication
   {
      #region IExternalDBApplication Members
      /// <summary>
      /// Registers an instance of a SampleExternalResourceDBServer with the ExternalService
      /// of type ExternalResourceService. 
      /// </summary>
      /// <param name="application">An object that is passed to the external application
      /// which contains the controlled application.</param>
      /// <returns>Return the status of the external application.  A result of Succeeded
      /// means that the external application was able to register the IExternalResourceServer.
      /// </returns>
      public ExternalDBApplicationResult OnStartup(ControlledApplication application)
      {
         // Get Revit's ExternalResourceService.
         ExternalService externalResourceService = ExternalServiceRegistry.GetService(ExternalServices.BuiltInExternalServices.ExternalResourceService);

         if (externalResourceService == null)
            return ExternalDBApplicationResult.Failed;

         // Create an instance of your IExternalResourceServer and register it with the ExternalResourceService.
         IExternalResourceServer sampleServer = new SampleExternalResourceDBServer();
         externalResourceService.AddServer(sampleServer);
         return ExternalDBApplicationResult.Succeeded;
      }


      /// <summary>
      /// <para>Implements the OnShutdown event.</para>
      /// <para>The server implementer may wish to perform clean-up tasks here.  However, in the
      /// simplest case, no server-related code is required, and the server will be
      /// destroyed as Revit shuts down.</para>
      /// </summary>
      /// <param name="application">An object that is passed to the external application
      /// which contains the controlled application.</param>
      /// <returns>Return the status of the external application.</returns>
      public ExternalDBApplicationResult OnShutdown(ControlledApplication application)
      {
         return ExternalDBApplicationResult.Succeeded;
      }

      #endregion IExternalDBApplication Members
   }
}