Revit IExternal Application Error- doesn't seems to run at all

Question

Should we have something with the External application to properly register the event?

I also tried putting two breakpoints one inside the start module and other inside the Export module. the first responded and waited for me to continue and the next didn't respond(hope did not run the line)

Also,I had manually tried coping the addin file to the addin location to avoid any post build event error but still doesnt seem to work.

could you tell me what I am I doing wrong here.

Here is the code :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using Autodesk.Revit.ApplicationServices;
using Autodesk.Revit.Attributes;
using Autodesk.Revit.UI.Events;
using Autodesk.Revit.DB.Events;
using System.IO;

namespace UserDataSheet
{
    [Transaction(TransactionMode.Manual)]

    [Regeneration(RegenerationOption.Manual)]

    public class UserDataSheetclass : IExternalApplication
    {
        public Result OnShutdown(UIControlledApplication application)
        {
            return Result.Succeeded;
        }

        public Result OnStartup(UIControlledApplication application)
        {
            try
            {
                // Register event. 
                application.ControlledApplication.DocumentOpened += new EventHandler<Autodesk.Revit.DB.Events.DocumentOpenedEventArgs>(ExportLog);
                return Result.Succeeded;
            }
            catch (Exception)
            {
                return Result.Failed;
            }
        }
        public void ExportLog(object sender, DocumentOpenedEventArgs args)
        {
            var doc = sender as Document;
            var isFamilyDoc = doc.IsFamilyDocument;

            // variables to use 
            string RevitUserName = "";
            DateTime OpenTime = new DateTime();
            string localUserName = "";
            string filename = "";
            string filepath = "";
            string content = "";

            if (isFamilyDoc == false)
            {

                var IsloggedIn = Autodesk.Revit.ApplicationServices.Application.IsLoggedIn;
                if (IsloggedIn == true )//&& doc.IsModelInCloud == true)
                {
                    // use variables
                    filepath = doc.PathName;
                    filename = doc.Title;
                    RevitUserName = doc.Application.Username;
                    OpenTime = DateTime.Now;
                    localUserName = System.Environment.MachineName;

                }
                content = string.Format("Date and time : {0} \n Revit UserName : {1} \n Local PC UserName : {2} \n FileName : {3} \n FilePath : {4} "
                    , OpenTime.ToString(), RevitUserName, localUserName, filename, filepath);
                TaskDialog.Show("Model Open Writer info", "user and file details : \n " + content);
            }
            var writefilepath = Path.GetTempPath();
            var Writefile = writefilepath + "//records.txt"; 
            FileStream fs = new FileStream(Writefile, FileMode.Append);
            StreamWriter writer = new StreamWriter(fs);
            writer.Write(content);
            writer.Close();
            File.OpenRead(Writefile);

        }  
    }
}

Answer 1

First of all, you can completely remove the TransactionMode and RegenerationOption. The latter is completely obsolete and does nothing at all anywhere whatsoever. The former is only useful when declaring an external command. It is useless and ignored in the context of an external application.

Secondly, to address your question: you can set a breakpoint in the beginning of OnStartup. If the breakpoint is not hit, your add-in is not being loaded at all. Probably something is wrong with your add-in registration, e.g., in the add-in manifest *.addin file.

Go back to square one, i.e., work through the getting started material and the developer guide instructions on registering and loading a Revit add-in.