assets/samples/Samples/Events/AutoStamp/CS/Application.cs

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// (C) Copyright 2003-2023 by Autodesk, Inc.
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// Permission to use, copy, modify, and distribute this software in
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using System;

using Autodesk.Revit.UI;

namespace Revit.SDK.Samples.AutoStamp.CS
{
    /// <summary>
    /// This class implements the methods of interface IExternalApplication and register View Print related events.
    /// OnStartUp method will register ViewPrinting and ViewPrinted events and unregister them in OnShutDown method.
    /// The registered events will help implement the sample functionalities. 
    /// </summary>
    [Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Manual)]
    [Autodesk.Revit.Attributes.Regeneration(Autodesk.Revit.Attributes.RegenerationOption.Manual)]
    [Autodesk.Revit.Attributes.Journaling(Autodesk.Revit.Attributes.JournalingMode.NoCommandData)]
    public class Application : IExternalApplication
    {
        #region Class Member Variable
        /// <summary>
        /// Events reactor for ViewPrint related events
        /// </summary>
        EventsReactor m_eventsReactor;
        #endregion


        #region IExternalApplication Members
        /// <summary>
        /// Implements the OnStartup method to register events when Revit starts.
        /// </summary>
        /// <param name="application">Controlled application of to be loaded to Revit process.</param>
        /// <returns>Return the status of the external application.</returns>
        public Autodesk.Revit.UI.Result OnStartup(UIControlledApplication application)
        {
            // Register related events
            m_eventsReactor = new EventsReactor();
            application.ControlledApplication.ViewPrinting += new EventHandler<Autodesk.Revit.DB.Events.ViewPrintingEventArgs>(m_eventsReactor.AppViewPrinting);
            application.ControlledApplication.ViewPrinted += new EventHandler<Autodesk.Revit.DB.Events.ViewPrintedEventArgs>(m_eventsReactor.AppViewPrinted);
            return Autodesk.Revit.UI.Result.Succeeded;
        }

        /// <summary>
        /// Implements this method to unregister the subscribed events when Revit exits.
        /// </summary>
        /// <param name="application">Controlled application to be shutdown.</param>
        /// <returns>Return the status of the external application.</returns>
        public Autodesk.Revit.UI.Result OnShutdown(UIControlledApplication application)
        {
            // just close log file
            m_eventsReactor.CloseLogFiles();
            //
            // unregister events
            application.ControlledApplication.ViewPrinting -= new EventHandler<Autodesk.Revit.DB.Events.ViewPrintingEventArgs>(m_eventsReactor.AppViewPrinting);
            application.ControlledApplication.ViewPrinted -= new EventHandler<Autodesk.Revit.DB.Events.ViewPrintedEventArgs>(m_eventsReactor.AppViewPrinted);
            return Autodesk.Revit.UI.Result.Succeeded;
        }
        #endregion
    }
}