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Keep track of element editings or element edited event in Revit 2018/ 2019

I am working on a project that rebars to host elements in Revit 2018 and Revit 2019. After my code regenerates the rebar reinforcement for the host element, I can not know if the user has manually edited my host or my rebars (generated by my code, of course). I just come up with these 2 ideas:
Store all rebar and host info into the host 's extensible storage (literally every property, ids, ….) at the time the rebars are generated by my code. When I call my code to work on the host again, I am going to compare all the current info with the saved info in the host 's entity to find out what has been changed.
Clearly, this approach is going to cost me a lot and has a huge penalty on performance.
Catch all the change the user might do to my rebars and hosts through an "Element - edited - event". However, I can't seem to find the right event that suits my need. I 've tried Element and Document events and ITransactionFinalizer class without results.
Where can I find the event I want or how to achieve what I wanted? Another and better approach is much welcome. Thank you all in advance.

Congratulations on spotting the link to Tracking Element Modification yourself. I would have pointed to that too. You might also want to check out the GitHub repository for that project, plus a follow-up project idea:
TrackChanges
TrackChangesCloud
Looking forward to hearing about your final solution. If it is generic enough to be of interest to others as well, I would love to share it on the blog for you. Thank you!

The solution I (as well as Mr. Jeremy Tammik) have mentioned Tracking Element Modification
is what I need, but it is a little too generic though.
For a more detailed solution to this specific problem, I filtered for my rebar host (beam, column, wall …) , get all the hosted rebars then take a snapshot of their parameters.
Some small notes for newbies like me though:
Some of the parameters will change depends on other ones. If user modification is what you are after, filter out the ReadOnly parameter that has been changed will narrow the list down quite a bit.
If you delete all rebar from host, or add rebar to an empty host, some parameters will be removed or added accordingly.

Tracking how resources are used at runtime to find missing translations

We maintain an ASP web app, which has a publicly visible interface that has to be localised into a large number of languages, and a private interface that still needs localisation, but only into a subset of the languages.
As much as possible, when we localise we put them into different resource files according to whether the string could appear on the public interface, or only the private one. However, inevitably mistakes are made, and I'd like to find ways to find resources that have been classified incorrectly. There's a lot of code shared between them, so the assembly that some code is in is not sufficient to determine this.
One way of doing this would be to record the resource name & location of every resource that gets accessed via the public interface, which allows us to (a) detect any that have been misclassified as private, and (b) investigate any that have been categorised as public but don't appear in this list. It looks like this might be possible by providing custom resource providers that wrap the default ones but record resource keys.
An alternative, but potentially more useful, option would be to record when a resource couldn't be found in a specific culture, and the system has had to fall back to the invariant culture resource. This will help us track down any untranslated messages. However, I'm struggling to find a way to do this.
Are there any good solutions here to avoid me writing my own? How do others manage similar scenarios? We'd rather avoid the cost of unnecessarily translating strings that can only be seen in the private interface into languages that it's not supported for.

In the interest of full disclosure, I'm the (sole) author of a commercial localization program for Visual Studio. I therefore stand to profit if you decide to research and purchase it. I'm not here to sell you a copy of it though (I don't work that way). I'm trying to legitimately help you and my program may be able to (though it's still unclear to me at this stage). You'ld also have to be open to a paid solution of course, assuming you can't find a better way. If I knew of a way for free I'd post it here. In fact, if my app didn't take so long to originally develop I would have given it away for free. I suggest you download the evaluation copy at http://hexadigm.com/FreeDownLoads.aspx (developer's version) to get an idea of what it can do (and ideally read about it on the site first). The evaluation version can only translate 10% of your strings however so it may be unwieldy to properly test what you're after. The program may have potential ways to deal with your situation though, if I understand it correctly, but it remains to be seen (for instance, you could bundle your public and private strings into separate ".trn" files, which you'll learn about if you research the app, but you obviously need to identify these strings first of course - how my app can help in that regard is still unclear). The upshot is you'll need to get a basic understanding of the program first though. It may be better to contact me offline at support#hexadigm.com. I don't believe any further discussion here will benefit other users but if the moderators feel otherwise then they can weigh in (I'd be happy to discuss it here if they wish, since the app does address various localization deficiencies in Visual Studio, but I don't want to violate the site's rules - I'm not here to promote the app so I won't discuss any specifics without their approval).

C# Resources: display resource string names instead of localized values

Having rather large project using Resources for internationalization (following this guide: ASP.NET MVC 2 Localization complete guide, using things like data attributes, and so on) we run into the need of translating the resource files. In the beggining of project I selected approach to have lot of small resource files - for each view, viewmodel, controller, ... So I ended up having hundreds of resources. During the translations (which is done by our partners using ResXManager tool we run into trouble identifying the context of the string (where is it displayed, to find out the correct form of translation to make sense when displayed).
So I was asked to make the mutation of application which do not display the localized values, but the keys (or string names). E.g. having string in resources TBL_NAME used somewhere in the view like #ResX.TBL_NAME and translated into english as "Name", I would like to show it in this special mutation as "TBL_NAME", so the translator may see the context - where exactly this string is used.
The best would be, if this is not special build of application, but rather the another "language" of the application available for translators, so he can switch between english and this "unlocalized" languages.
I'm looking some easy ideas of doing this. So far I was thinking of these approaches:
Override ResourceManager.GetString - cannot use, because we use generated Designer classes to access strings massively and so far I haven't find a way to change created ResourceManager (see this answer). Did I miss something?
Create resources for some unused language, which will contain pairs string name/translated value as TBL_NAME/TBL_NAME - viable, but very exhausting since we have hundreds of resources. Also the addition of new resource will require us to remeber that we need to add also this unused language resource will exact same strings name. You also have to do twice much work when adding single string to application.
At the moment, it seems for me, that using resources and current approach it is impossible to solve this task, so I decided to ask this as question (and I'm aware it is rather discussion than question) here, hoping, someone will give me some hint about other approach to solve this problem.

My preferred option would be to give the translators an environment where they can see what they are translating. Rigi requires a bit of setup (basically you need to add an additional UI language), but once you have done that translators can work within the live website - or in a test instance, which is what we did.
They can also work in screenshots, which is convenient when translators would have to access admin or other role specific pages but you do not want to bother giving them all kinds of user rights. These screenshots can be generated as part of automated UI tests or during manual UI testing.
I am afraid I can't say anything about the cost of the solution, but our translators are really happy with it. I am not sure if this is what you are looking for since you asked for an easy solution, but it definitely solves the issue of giving translators the context they need to do their job - better than displaying resource IDs.

Stand-alone Error Page with translated text?

I'm working on a website that will deployed internationally. Very big site, but for the sake of simplicity, all we're concerned about is my Error.aspx with c# code behind. I'd like to make this custom error page as dynamic as possible. There's at least a handful of languages we need to read this page in right now, and more to come. This page needs to work independently and without a database to reference.
I'd like to have some text, and have the appropriate translation appear based on the language appropriate for that domain... e.g. ".com" = English, ".ca/fr" = French, ".mx" = Spanish... you get the idea.
What's the best way to do this?
I've looked into API's, but the decent ones have a cost threshold, and while it might look really helpful, this is just pretty standard error message text, that's unlikely to change, so that seems like overkill to have a dynamic translator. It might help with scalability, but it's extra money indefinitely, when it will only save vs hard-coding on the handful of occasions where we add another language/country/domain.
The other idea I had was to simply hardcode it in the c#. parse out Request.URL and get the domain, and make a ever-growing switch statement which would assign the appropriate text. (As an aside, I'm also trying to find a better way to do this, but is the country code something that would be an available piece of information from either the request object or server?) This way would be independent, precise, and the only drawback on a concrete level would be the cost of adding new languages, or changing every string (probably not that many, at least at first) if the content of the error message needed to be adjusted. But this feels like bad practice.
I've been researching this for a day now, but I haven't found any alternatives to these 2 options. What are the best practices for handling small amounts of text for translation, without the use of a CMS?

There is an easy built-in way to handle localization in ASP.NET Web Forms. It uses the Language Preference settings in the client's browser to select the language. Posting the steps of setting it up would be redundant since there's lots of information on this subject available online. Here is a good tutorial.
EDIT:
It might be a good idea to read up on HTML resource files. That is the HTML standard for handling different languages (referred to as localization). And it is what ASP.NET uses in the background when creating a local resource for a server control.

How can I make a "greenscreen" web app?

In informal conversations with our customer service department, they have expressed dissatisfaction with our web-based CSA (customer service application). In a callcenter, calls per hour are critical, and lots of time is wasted mousing around, clicking buttons, selecting values in dropdown lists, etc. What the dirrector of customer service has wistfully asked for is a return to the good old days of keyboard-driven applications with very little visual detail, just what's necessary to present data to the CSR and process the call.
I can't help but be reminded of the greenscreen apps we all used to use (and the more seasoned among us used to make). Not only would such an application be more productive, but healthier for the reps to use, as they must be risking injury doing data entry through a web app all day.
I'd like to keep the convenience of browser-based deployment and preserve our existing investment in the Microsoft stack, but how can I deliver this keyboard-driven ultra-simple greenscreen concept to the web?
Good answers will link to libraries, other web applications with a similar style, best practices for organizing and prioritizing keyboard shortcut data (not how to add them, but how to store and maintain the shortcuts and automatically resolve conflicts, etc.
EDIT: accepted answers will not be mini-lectures on how to do UI on the web. I do not want any links, buttons or anything to click on whatsoever.
EDIT2: this application has 500 users, spread out in call centers around North America. I cannot retrain them all to use the TAB key

I make web based CSR apps. What your manager is forgetting is now the application is MUCH more complex. We are asking more from our reps than we did 15 years ago. We collect more information and record more data than before.
Instead of a "greenscreen" application, you should focus on making the web application behave better. For example,dont have a dropdown for year when it can be a input field. Make sure the taborder is correct and sane, you can even put little numbers next to each field grouping to indicate tab order. Assign different screens/tabs to F keys and denote them on the screen.
You should be able to use your web app without a mouse at all with no loss of productivity if done correctly.
Leverage the use of AJAX so a round trip to the server doesn't change the focus of their cursor.
On a CSR app, you often have several defaults. you should assign each default a button and allow the csr to push 1 button to get the default they want. this will reduce the amount of clicking and mousing around.
Also very important You need to sit with the CSR's and watch them for a while to get a feel for how they use the app. if you haven't done this, you are probably overlooking simple changes that will greatly enhance their productivity.

body { background: #000; color: #0F0; }
More seriously, it's entirely possible to bind keyboard shortcuts to actions in a web app.
You might consider teaching your users to just use the Tab key - that's how I fill out most web forms. Tab to a select list and type out the first few letters of the option I'm attempting to select. If the page doesn't do goofy things with structure and tabindexes, I can usually fill out most web forms with just the keyboard.

As I had to use some of those apps over time, will give my feedback as a user, FWIW, and maybe it helps you to help your users :-) Sorry it's a bit long but the topic is rather close to my heart - as I had myself to prototype the "improved" interface for such a system (which, according to our calculations, saves very nontrivial amounts of money and avoids the user dissatisfaction) and then lead the team that implemented it.
There is one common issue that I noticed with quite a few of CRMs: there is 20+ fields on the screen, of which typically one uses 4-5 for performing of 90% of operations. But one needs to click through the unnecessary fields anyway.
I might be wrong with this assumption, of course (as in my case there was a wide variety of users with different functions using the system). But do try to sit down with the users and see how they are using the application and see if you can optimize something UI-wise - or, if really it's a matter of not knowing how to use "TAB" (and they really need to use each and every of those 20 fields each time) - you will be able to coach a few of them and check whether this is something sufficient for them - and then roll out the training for the entire organization. Ensure you have the intuitive hotkey support, and that if a list contains 2000 items, the users do not have to scroll it manually to find the right one, but rather can use FF's feature to select the item by typing the start of its text.
You might learn a lot by looking at the usage patterns of the application and then optimizing the UI accordingly. If you have multiple organizational functions that use the system - then the "ideal UI" for each of them might be different, so the question of which to implement, and if, becomes a business decision.
There are also some other little details that matter for the users - sometimes what you'd thought would be the main input field for them in reality is not - and they have an empty textarea eating up half of the screen, while they have to enter the really important data into a small text field somewhere in the corner. Or that in their screen resolution they need the horizontal scrolling (or, scrolling at all).
Again, sitting down with the users and observing should reveal this.
One more issue: "Too fast developer hardware" phenomenon: A lot of the web developers tend to use large displays with high resolution, showing the output of a very powerful PCs. When the result is shown on the CSR's laptop screen at 1024x768 of a year-old laptop, the layout looks quite different from what was anticipated, as well as the rendering performance. Tune, tune, tune.
And, finally - if your organization is geographically disperse, always test with the longest-latency/smallest bandwidth link equivalent. These issues are not seen when doing the testing locally, but add a lot of annoyance when using the system over the WAN. In short - try to use the worst-case scenario when doing any testing/development of your application - then this will become annoying to you and you will optimize its use - so then the users that are in better situation will jump in joy over the apps performance.
If you are in for the "green screen app" - then maybe for the power users provide a single long text input field where they could type all the information in the CLI-type fashion and just hit "submit" or the ENTER key (though this design decision is not something to be taken lightly as it is a lot of work). But everyone needs to realize that "green-screen" applications have a rather steep learning curve - this is another factor to consider from the business point of view, along with the attrition rate, etc. Ask the boss how long does the typical agent stay at the same place and how would the productivity be affected if they needed a 3-month term to come to full speed. :) There's a balance that is not decided by the programmers alone, nor by the management alone, but requires a joint effort.
And finally a side note in case you have "power users": you might want to take a look at conkeror as a browser - though fairly slow in itself, it looks quite flexible in what it can offer from the keyboard-only control perspective.

I can't agree with the others more when they say the first priority of the redesign should be going and talking to / observing your users and see where they have problems. I think you would see far more ROI if you find out the most common tasks and the most common errors your users make and streamline those within the bounds of your existing UI. I realize this isn't an easy thing to do, but if you can pull it off you'll have much happier users (since you've solved their workflow issues) and much happier bosses (since you saved the company money by not having to re-train all the users on a completely new UI).
After reading everyone else's answers and comments, I wanted to address a few other things:
EDIT: accepted answers will not be mini-lectures on how to do UI on the web. I do not want any links, buttons or anything to click on whatsoever.
I don't mean to be argumentative, but this sounds like you've already made up your mind without having thought of the implications on the users. I can immediately see a couple pitfalls with this approach:
A greenscreen-esque UI may not be
more productive for your users. For
example, what's the average age of
your users? Most people 25 and
younger have had little to no
exposure to these types of UIs.
Suddenly imposing this sort of
interface on them could cause a
major backlash from your users. As an example, look at what happened
when Facebook decided to change its
UI to the "stream" concept - huge
outrage from the users!
The web wasn't really designed with this sort of interface in mind. What I mean is that people are not used to having command-line-like interfaces when they visit a website. They expect visual medium (images, buttons, links, etc.) in addition to text. Changing too drastically from this could confuse your users.
Programming this type of interface will be tough. As in my last point, the web doesn't play well with command-line-like or text-only interfaces. Things like function keys, keyboard shortcuts (like ctrl- and alt-) are all poorly and inconsistently supported which means you'll have to come up with your own ways of accessing standard things like help (since F1 will map to the web browser's help, not your app's).
EDIT2: this application has 500 users, spread out in call centers around North America. I cannot retrain them all to use the TAB key
I think this argument is really just a strawman. If you are introducing a wholly new UI, you're going to have to train your users on it. Really, it should be assumed that any change to your UI will require training in one form or another. Something simple like adding tab-navigation to the UI is actually comparatively small in the training department. If you did this it would be very easy to send out a "handy new feature in the UI" email, or even better, have some sort of "tip of the day" (that users can toggle off, of course) which tells them about cool timesaving features like tab navigation.
I can't speak for the other posters here, but I did want to say that I hope you don't think we're being too argumentative here as that's not our (well OK, my) intent. Rather the reaction comes from us hearing the idea for your UI and not being convinced that it is necessarily the best thing for your users. You are fully welcome to say I'm wrong and that this is what your users will benefit most from; but before you do, just remember that at the end of the day it's your users who matter most and if they don't buy in to your new UI, no one will.

It's really more of a keyboard-centric mentality when developing. I use the keyboard for as much as possible and the apps I build tend to show that (so I can quickly go through my use cases).
Something as simple as getting the tab order correct could be all your app needs (I guess I'm not sure if you can set this in ASP.NET...). A lot of controls will auto-complete for the rest.