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The only place I encounter that is the annoying XAML tendency to want rebuilds when items are added or namespaces changed.
Of course I'm running Resharper, so that might be a factor.
"There are three kinds of lies: lies, damned lies and statistics."
- Benjamin Disraeli
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I never code without ReSharper, so I doubt that's the differentiator.
"'Do what thou wilt...' is to bid Stars to shine, Vines to bear grapes, Water to seek its level; man is the only being in Nature that has striven to set himself at odds with himself."
—Aleister Crowley
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Brady Kelly wrote: Or is this situation unique to my Visual Studio only
Yes, it's you. VS uses the web.config file in the Views folder to determine what assemblies to load to verify your razor code. If you are getting squiggles in the editor it is likely that your Views\web.config file is not correct.
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MVC Core doesn't have any of the two older web.configs, and I get this problem as soon as I create a new MVC web app project, without adding or changing anything.
"'Do what thou wilt...' is to bid Stars to shine, Vines to bear grapes, Water to seek its level; man is the only being in Nature that has striven to set himself at odds with himself."
—Aleister Crowley
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Sounds like, broken by design. 
Common sense is admitting there is cause and effect and that you can exert some control over what you understand.
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Why ever would MS do that? Do they want me to purchase a competing IDE?
"'Do what thou wilt...' is to bid Stars to shine, Vines to bear grapes, Water to seek its level; man is the only being in Nature that has striven to set himself at odds with himself."
—Aleister Crowley
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I've never had that problem.
Brady Kelly wrote: yet the bloody text editor thinks there are 20 errors in one screen of a Razor view .cshtml file.
Ah, yes, there I've noticed that. It's weird, if I let VS mull it over for a few minutes (literally, on this POC machine I have at work) the squiggles go away. I also read somewhere that deleting the PDB files or something, don't remember what, refreshes "stuff" so the editor works again, at least for a while.
But then again, the whole idea of mixing server-side code inside an HTML file that is already polluted with Javascript that gets turned into "print" statements with embedded code that is then compiled and executed to generate the HTML, well, I know that was like the coolest thing since sliced bread when people started doing it, and certainly all those script-kiddie languages glommed onto the idea right away, but in actual practice, I find it a horrendous approach. I could elaborate, but I don't think it's necessary.
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I don't mix real "server code" into my Razor pages, only that code that issues the "print statements" you mention.
"'Do what thou wilt...' is to bid Stars to shine, Vines to bear grapes, Water to seek its level; man is the only being in Nature that has striven to set himself at odds with himself."
—Aleister Crowley
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I still use VS2015 and I never could wrap my head around MVC. To me it was just Classic ASP wrapped in a shiny new veneer.
I'll stick with Standard ASP.NET if I ever have to write a web application again...
Steve Naidamast
Sr. Software Engineer
Black Falcon Software, Inc.
blackfalconsoftware@outlook.com
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I use VS 2017 every day and I cannot complain. Heck, Microsoft gave me this excellent IDE for free (At least the Community Edition.) Let's give MS some credit for that! 
Get me coffee and no one gets hurt!
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"Free" crap is still crap.
".45 ACP - because shooting twice is just silly" - JSOP, 2010
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You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
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When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013
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FWIW, I see this every once in a while in purely C# code (WinForms project), so it's not unique to Razor. I might have legitimate errors, fix them, but the red squigglies don't go away. Sometimes restarting VS makes them go away, but at other times, they persist.
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If you were getting this behavior on code, then I'd say your intellisense database is corrupt. Its been a problem in VS ever since they introduced it. I dunno.. maybe intellisense also builds a database for cshtml files too. You might try deleting the old database to force it to regenerate and see if that fixes the problem.
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Yes, this looks to be a likely cause, because my Intellisense is really sick, whatever I am working on.
Could you please tell me how to delete that database?
"'Do what thou wilt...' is to bid Stars to shine, Vines to bear grapes, Water to seek its level; man is the only being in Nature that has striven to set himself at odds with himself."
—Aleister Crowley
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I can tell you the incantation(s) I use. I'm sure I have a lot of unneeded steps in them all, but I've never been able to trim it down to less because whenever I leave a step out, it seems that incantation doesn't work.
The shotgun incantation that seems to work when all others fail is this:
(this is on VS2015) close all tabs of all files, clean the solution (release and debug builds), exit VS, watch the disk activity and wait until the activity from VS ends, find and remove the .suo file, reopen VS, wait until it's disk activity ends, open the project, wait until its disk activity ends (sometimes this takes a while), rebuild the solution. Open a file of the project, wait until VS's disk activity ends.
Sometimes, I can get away with just closing all the tabs, cleaning the generated files, exiting and then restarting VS.
On older versions of VS (e.g. 2005), there were ways to bind intellisense controls to menu entries, but I either quit looking for them because they stopped helping, or they took them away.
Hope that helps.
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Thanks, but as someone said above, for them it was ReSharper, and I strongly suspect for me as well. I've told R# to ignore Razor files when analyzing. Any rare false errors when editing plane C# vanish after a few seconds. Razor is the only place I these errors take hours to go away, or don't, but my app still works fine.
Intellisense is another troubled tool for me, even in plain C# files. As has been suggested, I will try clearing the Intellisence db as soon as I know where to find this database.
"'Do what thou wilt...' is to bid Stars to shine, Vines to bear grapes, Water to seek its level; man is the only being in Nature that has striven to set himself at odds with himself."
—Aleister Crowley
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I can't recall exactly where that database is kept these days, but I know for certain it isn't in the view with the project files. I suspect that's part of intellisense's problem since I've had major intellisense issues if I ever open two instances of VS -- the database is in a file that all instances of visual studio access, so they clobber each other's database. I don't run multiple instances of VS for anything these days if I can help it.
Perhaps Resharper made a similar design decision and suffers from a similar pitfall.
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I've had that with WinForm recently, but only when changing branch in Git. It doesn't always happen, but sometimes everything would compile and run, but I would see errors in the error window. Stopping VS, removing the .suo file(s) and starting VS again would fix the issue.
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I get no errors in the error window, just underlines and squigglies.
"'Do what thou wilt...' is to bid Stars to shine, Vines to bear grapes, Water to seek its level; man is the only being in Nature that has striven to set himself at odds with himself."
—Aleister Crowley
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I've used most C# projects of VS2017 since release and I only encountered this once; when my IntelliSense database failed to synchronize with one of our automated backup solutions.
So.. I'm guessing it's either a bug in the newer ASP projects or it depends on an external factor.
Have you considered eliminating plugins, extensions and non-typical project settings?
Have you properly debugged your own Visual Studio environment?
A bug is a bug. Just fix it like the rest of 'em.
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Touché. I have done only superficial debugging of VS and extensions. But I now have a small gig to do, and this debugging will have to wait until I finish that. At least I can just ignore the visually apparent syntax errors; everything still builds and works fine.
"'Do what thou wilt...' is to bid Stars to shine, Vines to bear grapes, Water to seek its level; man is the only being in Nature that has striven to set himself at odds with himself."
—Aleister Crowley
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This happened to me about a year ago specifically for razor files. It turned out in my case that it was resharpers syntax highlighting that didn't support razor in mvc core projects yet. I disabled resharper for razor files (somewhere in resharper settings you can tell it to ignore .cshtml files) and all the crazy squiggles went away.
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when it happens to me, I change a character in the model for the razor file, usually in the first line of the file, hit enter and save the file, this triggers some background recompilation and checks and after a few moments the squiggles go away
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Have not seen this, but I don't do web/razor view stuff so maybe I'm avoiding it.
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Oh yes, you are avoiding it big time.
"'Do what thou wilt...' is to bid Stars to shine, Vines to bear grapes, Water to seek its level; man is the only being in Nature that has striven to set himself at odds with himself."
—Aleister Crowley
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