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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.

Pre-process MVC Razor File For Multi-Lingual Language Strings?

In my application we have multi-lingual language strings which are stored in custom tables, as the user can edit, delete, import new languages etc... via a UI
Currently, what I'm doing is at the beginning of each request is. I'm going off and getting all the language strings (From our database) for the currently selected language and sticking them in a dictionary.
I then have a Html Helper extension method which I use in the razor views (See below), which fishes in the dictionary I got at the beginning of the request to pull out the correct language based on the key supplied in the helper.
Html.LanguageString("MyLanguage.KeyHere")
Now this works fine. However, as the application is getting bigger. We are getting more and more language strings. It's not an issue right now, as its still very fast as there are only around 200 strings to get.
But this also means I'm getting all of them, even if a page has say one on it. I'd ideally like a way of processing the LanguageString("")'s before hand and doing a query to just get those that are needed at the beginning of the request? Or maybe my own linq based language that can be processed and product a more efficient call.
I'm looking for some advice on how to do this. As I'd like the application to be as efficient as possible. Any advice, help, tips are greatly received. Thanks.

I'd suggest caching language strings on the application basis rather than fetching them for every request. For example, this can be done by maintaining a static dictionary and invalidating the cache only when the user makes changes to these strings. This will make your application more responsive as well as save you from implementing (imho) rather more complex and not necessarily efficient technique of loading this data on-demand.
As a side note I'd add the following: it's usually a good practice to address these kinds of problems when they arise (rather than fixing something that is not broken) and focus on more important things. I totally agree that performance implications of a given solution must always be taken into consideration, I'm just saying that premature optimizations are not always a good idea.

ASP.NET MVC 3 Razor View Restrictions

I apologize in advance for the generic nature of my question, but I was unable to find any helpful advice from people trying to do the same thing as me on the web. Let me describe my scenario:
I am providing end users/designers of a website the ability to customize their views by storing the views (using Razor) in the database. I have all of this working, but my question is the following; From a security standpoint, how can I ensure and enforce that unwanted code doesn't get executed in the user-defined view? There are two basic approaches that I think will work conceptually, but am not sure which one is more possible or feasible.
Option 1: Create a validation method in the administration tool that allows the user to input the view code. This would need to either take a whitelist or blacklist approach to what is allowable or not.
Option 2: Prevent unwanted code from being able to execute when rendering of the view occurs.
As a quick example of something that would need to be blocked, we wouldn't want to allow access to read or write files, access any data access functions, or even access configuration settings, etc. in the web.config. There will likely be a decently-sized list of things that probably shouldn't be allowable, but I'll need to sit down and try to think of as many security-related concerns as possible.
My question then is, which method would be the best bet? Also, can any direction be provided on how to go about either? I thought I might be able to make trust-level based change which would be Option 2, but couldn't find any way to make that work in a per-view based manor (the administration code is allowed to execute whatever it wants). I'm thinking Option 1 will end up being the best bet and I'll have to check for the input of certain framework functions that shouldn't be allowed. Does anyone have any experience doing anything like what I'm trying to do? ANY feedback is much appreciated!

This would be extremely difficult.
You could run the the template through the Razor preprocessor, then use Roslyn (still in early beta) to parse the generated file and look through all method calls (or constructors) and return an error if it calls something you don't like.
I strongly recommend that you use a whitelist for that, since the .Net framework is big enough that you are bound to overlook something in a blacklist.
However, I would instead recommend that you not use Razor at all and instead use a templating engine that does not allow real C# code.

Is good or bad to write everything in c# rather than using web controls?

I'm confused with choosing between several ways of getting result in ASP.NET.
For example, Web form control SqlDataSource, you retrieve data from database and show results in other controls such as DataGridView, BulletedList etc. However all those things can be written in C#, creating a string which will hold your HTML codes with the retrived data, then you insert your Html code into div using innerHTML. What's the difference?
Example:
[ <div id='block1' runnat='server'></div]
and in CodeBehind
[ block1.innerHTML = myString;]
After writing C# code SqlConnect, Loops, Datatable, you put value of your HTML string into myString.
Why not to implement everything with C#?

Think about what's easiest. For simple cases, using markup, templates and databinding is usually easiest and most simple, because most of what's written is static markup - so we can stay in markup's "native land". But if the markup could radically change based on programmatic logic, then trying to express that in ASP.NET markup can be tedious at best.
Also think about deployment and reuse - templates might also be easier to maintain for a single application, but harder to package and reuse in different applications.
You want to minimize effort and complexity. Achieving these flow directly into less bugs and more stability, plus shorter delivery time. So think about how effort and complexity are affected by:
How hard will it be for you to write?
How hard will it be for you (or others) to change? - if this is a throwaway application, or unlikely to change much, this is less of a concern.
How hard will it be to deploy?
How hard will it be to reuse? - if there is no reuse, this is not a concern.

Writing it all in pure C# is possible but not very convenient when you are trying to achieve a specific html layout - it is painful to maintain, and very hard to work alongside a developer if you want to take their html and just tweak it to add the data.
Personally I'd look at MVC here; for example, I've been playing with razor recently which allows very elegant integration between C# and html in the same file:
<div id="#obj.Id">
<ul>
#foreach(var item in obj.Items) {
<li>#item.Name</li>
}
</ul>
</div>
There I can:
clearly see at a glance how the code maps to the source I can see at the client
make changes with confidence, both from visual inspection and the IDE telling me if I do something obviously wrong
compare to the designer's draft easily

Mostly for maintenance reasons.
Can you imaging how much difficult it can get to make changes to it or debug it? And since it is not a traditional approach, any programmer after you that has to work on that code will of course not be happy with it.
Always remember,
HTML is for markup (for example, Building)
UI customization/styles go to CSS and Themes are for Server Control customization (for example, Paint)
C# (or code-behind to be specific) is for logic (for example, Amenities or wiring up).