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I use Visual Studio 2017 (15.6.6). When debugging, I try to evaluate simple expressions like int a = 2; in the immediate window. An error
Internal error in the C# compiler
is thrown.
I tried to enable Use Managed Compatibility Mode as hinted at in this question but it didn't help.
Thanks for any help.
Searching further I found this issue on GitHub where an answer recommends to also check Use the legacy C# and VB expression evaluators. Visual Studio gives me a warning about checking this option, but turning this on I can evaluate expressions in the immediate window again.
It is even possible to turn off the Use Managed Compatibility Mode again.
Update: Notice though that using the legacy expression evaluators prevents me from inspecting local variables at debug time, so I wouldn't call it a solution.
In my case, the problem was occurring in a particular assembly. When we looked at the assembly information, (from the Solution Explorer, right click on project, select Properties, then click on Assemble Information), it was all blank.
So we gave it a Guid, then re-built and it worked.
I had the same issue. Don't know if it's your option but for me it was the next issue: instead of "Debug" version the "Release" was turned on. So as soon as I switched back to debug I got rid of this error.
I've got the same error when deal with own NuGet package.
In my case VS resolve a path to the copy of my assembly in "%userprofile%.nuget" folder instead of build output folder.
Currently, I don't known how to prevent this miss-resolving for new project types, where no hint is specified for references, but there's simple workaround: just remove unpacked copy of package from %userprofile%\.nuget\packages\%yourpackage% before debug.
It is happening in Visual Studio 2022 17.3.2 too and it can be found "Closed, not enough info" on feedback hub. As always, incompetent outsourced india strikes again.
Anyway stopping debugging and rebuilding solution works. It have something to do with completely f****d and useless Hot Reload.
Clearing the directory C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files solved the issue for me. I'll try to build a repo if the issue appears again...
Whenever I go to add a service reference I get the error:
Failed to add Service Reference 'Servicereference1.reference'
Error: Unable to check out the current file. The file may be read-only or locked, or you may need to check the file out manually.
I already had a service reference in the project, but it broke somehow and gave me an error that stated:
Could not find default endpoint element that references contract (servicename)
The endpoints in both the web.config and the service reference config were the same (localhost)
I also could not update that reference as I would get the same 'unable to check out current file' error.
EDIT: The problem isn't native to just this project. I tried to make a new, totally separate project, and add a service reference to that and I got the same error.
I had the same error - what I found, was that there are problems if you have source control plugin "Microsoft Git provider" selected (my WCF solution was not added to source control!) and you try to add service reference.
set source control plugin to None
go to TOOLS > Options > Source Control.
add service reference
set the source control plugin to the original value
I know this has been answered, but before trying everything else in the answers, restart visual studio.
This just happened to me and 4 other people in my WCF class. Seems to be a problem with visual studio 2013 and not 2012.
As you have already cleared there is no source control involved(which seems to be cause of problem to me), you can try these steps:
Make sure if you copy paste from location where there was source control then remove source control specific files.
Make sure folder is not locked & also is not read-only. If it is so, then remove read-only from the folder.
Make sure visual studio is not in debugging mode while adding reference.
If above not works, close visual studio & restart it.
Make sure Visual Studio is started as "Run as Administrator".
Finally if all above doesn't work try restart machine.
Let me know if it works or not.
Maybe it's a bit late, but if someone has the same problem, I solved it running VS2013 as administrator.
Go to Debug menu and click on (Options and Settings)
Select Source Control.
Under Current Source ControlPlug-in drop down select none
Then click ok to save chnages,Now you can add service reference.
Oddly enough I was experiencing this in VS 2019, using git source control. I was able to resolve this by simply cleaning and rebuilding the project containing the service reference...
EDIT: If you already have a service reference that you're attempting to update you might have to delete it and add it again
Looks like some Visual studio file has gone corrupted. Try deleteing the reference completely then generate the reference using svcutil {http://{service}/metadataEndpoint} ( I assume it is WCF) or (use wsdl.exe for webservices), then get the client proxy and put it in the project to use it. See if that works fine.
Shutting down your default source control to add reference is horrible. #ScottG said above, and does work.. just start VS as administrator - that works, and you dont have to mess with your environment. VS 2013 UP-5 still has this issue.
Check if your files are read only, if yes remove the read only attribute and restart the visual studio and try to add service reference.
it worked for me like this.
Make sure, your folder in IIS where your services put (I mean the physical file; .svc) is not open or even selected in file manager. It's work for me, but before I almost went mad to find error.
My issue was related to source control but I found an easy work-around. Open the App.config file and make any change and save it. This unlocked the file and allowed me to add the service reference.
ok, I am last here and spend 1 day to search the solution , nothing was wrong in my code and I tried multiple times restart machine , close reopen visual studio but nothing worked .In my case there were some update in visual studio 2019 and that was causing the issue. After installing the update I was able to update the service reference. Hope this will be helpful for some one .
Why does Rebuild fail with no errors?
Since this morning, this error keeps showing up. I build the entire solution (25 C# managed projects) and a "Rebuild All failed" appears, but without any errors! (I have 13 warnings about COM not supporting Generics, but it's "normal" because one dll is exposed as COM.)
Not an answer per se - but you're better off looking at the output window and seeing what it says there.
Also, to help with that you might want to look at your MSBuild verbosity - as shown on this screenshot (last two options):
Beware - the highest level generates a MASSIVE amount of information.
Finally - running msbuild from the solution folder in a command prompt will really nail the issue - because error messages and warnings come up in red and yellow respectively.
I found my own solution and it is simple:
When this error occurs, save the project and close VS 2013. After that, re-open VS2013 and open the last project.
It works like a charm. But it is very annoying every time!
Many people reported this problem in VS2010, VS2012 and VS2013.
Could be a corrupt Solution User Options file.
Close the solution, delete its .suo (.v12.suo for VS2012+), reopen the solution, and Visual Studio will build a new one. You will lose the StartUp Project, breakpoints, bookmarks, which files are open, which projects/folders are expanded, etc. But that's all minor compared to the solution not building!
I had the same problem. I was trying to refrence a higher .net framework version(4.5.2) to lower .net framework version(4.5) which was causing build error. I made the version same in both projects and it worked.
Check the Output Window (View -> Output) as that will tell you what's going wrong. Sometimes a reference might be missing or there is an issue with the targeted version of .NET for one project in a solution.
Have you tried to clean the solution befor rebiuld it?
This is the list of checks & things I would do if I were you (try to build after each step):
Is error list activated? (Sometimes I forgot to activate and I can see only warnings & messages)
Check output window for error messages..
Clean solution.
Double check after clean that everything is deleted from debug folders.
Build it in release mode.
Build solution project to project until you isolate problematic project.
Remove COM and comment code to see if is this the source of problem.
Restart VS2010.
Restart windows.
Few moments ago I fix it with repair of .NET Framework installation (.NET Framework v4.0 Extended in my case).
I had the same issue in VS 2015. I tried the following with no success:
Close VS project and reopen
Close all open VS projects and reopen just the project that had the issue
Clean solution
Rebuild solution
Delete all files in bin\debug and bin\release
Lastly I tried Keith Robertson's answer, delete .suo (\Visual Studio 2015\Projects\[ProjectName]\.vs\[ProjectName]\v14\.suo). Although this didn't get me a good build, it did finally give me an error message stating that I had two entry points to my application. I went to application properties (Alt + Enter) and select a Startup object from the drop down.
This error seems a bit generic to me. I also went through this situation, but I managed to solve it differently than any of the ones mentioned here.
I have a project and several dependencies. And one of these dependencies has undergone a change.
When compiling the main project in debug mode, I verified that everything was ok.
However, switching to release mode and recompiling the problem occurred.Rebuild all failed and 0 Errors
By analyzing the debug output, I encountered an error:
Although the build dependencies are configured correctly. When compiling in release mode, the main project did not find the new method created in the secondary project.
So I had to recompile each secondary project one by one in release mode. After that, I recompiled the main project and everything worked.
Hope it helps someone!
I just had the same thing. For me, it helped to restart VS and run it as Administrator.
Select the appropriate target framework
- Right click on project
- Properties
- In application tab, Select the target framework
clean the solution
Try and build each project and see where the issue is.
Check each of the references (of each project) to make sure not have the yellow warning sign
Has the solution ever built?
I just had this happen to me, and realized that I left a '#error' line in my code and forgot about it. When I tried to build, the build failed but the #error line didn't show up in my errors.
Try searching all for '#error'
I fixed it on my new implementation of Visual Studio 2013 by going to the database project / Project Settings and noticing that the Target Platform was SQL Server 2014 instead of 2012 like it should be.
Once chance of getting this error is when we try re naming the service reference name, we give some other name in the service reference, but in the namespace some where it will be referring the old name, so if you delete and add a service reference then keep the same name, else we may face this error, but we can see the error in the Output window.
There are apparently many causes of this. I just found the cause of my issue: the .NET version of a new project I created was higher than the version of the top-level project. (4.5.2 vs 4.0)
I got a similar issue today, and fixed it with repair.
Start
Run…
Appwiz.cpl
(Find your installed Visual Studio version)
Right click
Change
Repair
In my case it was the wrong date and time of computer.
I was getting no feedback/messages/errors. Just that all projects failed to build.
I closed and tried again--I noticed an error saying "you are not authorized to access..."
I clicked on my account, re-entered my credentials, and rebuilt the solution.
Voila! I got what I am used to seeing when I build a solution -- plenty of errors in all their glory.
Hope this helps someone.
Here's yet another reason which may sound familiar to some. I had integrated some code into my solution that wrapped a DLL. The C# code file that came with it offered a nice managed API and handled the low-level LoadLibrary stuff to access the DLL. Both had the same base name, so I had SomeName.cs and SomeName.dll. I could just drop it into any project and it would work.
This wasn't so nice after a while as I started using it in different projects. I got copies of both the DLL and the wrapper code in multiple projects. So I figured it would be better to drop the wrapper code and the DLL into a new class library project and then reference that new project from other projects.
After I had done that, I started to get this issue. The build went well up until the very last stage and then failed without error. Output showed nothing but successes.
The problem was the name of the wrapping class library project. I used the same base name (SomeName) for this. By default the assembly name would be SomeName.dll and I already had one such file (the DLL to be wrapped), thus I had a conflict with output files.
After renaming the wrapping project and its output assembly to SomeNameWrapper, the problem went away.
This may not be your exact cause but it seems likely you have some name clash or deployment issue as well. And it is not surprising the compiler won't give you an error because there is no problem in the compilation phase, the trouble starts with deployment and apparently this does not come out in an obvious way.
I had the same problem the original poster was displaying with 0 errors and Rebuild all succeeded. The Output tab showed a message that a referenced dll was built with a higher version of the .NET Framework.
Changing the .NET framework to match resolved the issue I was having with 0 Errors and Rebuild All succeeded.
The solution:
Because Prerequisites not set for debug set only for release
01-Change solution configuration ( in main screen )
set (debug to release)
set solution platform to (Any CPU)
02-Set Prerequisites for debug ( If you want to continue in debug mode )
03-set target platform version for all Projects
Some of the files included in your solution are not in the correct directories, or you have changed the name of one or more directories in your application. In the solution explorer under Setup review the list of all files and remove those that are not properly listed in the SourcePath Property.
One of my dependency in View file caused this. Check your view files for any dependencies which is not injected yet.
I have a Class Library project in Visual Studio and tests for it (everything is written in C#). Once after successful solution build VS shows me this window:
I haven't seen this one before, and I don't know even from what to begin: project compiles without errors and works after compilation, but this window keep appearing after each compilation. When I press Retry or Abort, error message with the same text appears in Output window of VS.
There is only one test method named AddRange1201.
So, the question is - how to get rid of this, besides just checking "Do not show this dialog box again"?
I found this on MS Connect, and I'm not sure if it will fix your problem or not. Sounds like it's a known issue and occurs if you either add the test project to your solution twice (VS doesn't realize it's been added and removed) or if you switch between debug and release modes.
A workaround given is:
1) clean solutions in both modes
2) rebuild in the mode you want
Hopefully this helps.
I have a project in C# and I get this error every time I try to compile the project:
(Unable to copy file "obj\Debug\Project1.exe" to "bin\Debug\Project1.exe". The process cannot access the file 'bin\Debug\Project1.exe' because it is being used by another process.)
So I have to close the process from the task manager. My project is only one form and there is no multi-threading.
What is the solution (without restarting VS or killing the process)?
This should work.
Go to your project properties.
Inside Build Events, under Pre-build event command line, add these two lines of code:
if exist "$(TargetPath).locked" del "$(TargetPath).locked"
if exist "$(TargetPath)" if not exist "$(TargetPath).locked" move "$(TargetPath)" "$(TargetPath).locked"
#Udpate: Since the time I was first posting this 'answer', I tend to another explanation to the problem. The issue since than happened more and more often outside of Visual Studio also - while trying to copy an .exe file from one folder to another. While in the first place Windows did not allow to copy(!) an .exe file (it was first asking me for administrative rights but refused to copy it afterwards anyway) it still showed up in the explorer. But after a while - without any further action taken, it disappeared magically. Just like the problem in the question always seems to solve itself after a while. So i assume, the problem is more related to a delayed deletion of the project output file and less a buggy VS. I apologize for any unjustified suspicion. :|
This gives the search for a solution a complete different direction, I guess. Did find that link and will update on any progress:
https://superuser.com/questions/234569/windows-7-delayed-file-delete
========================================================================
This is a known bug in VS. I discovered it very often - mostly in VS2010 (with/without SP1). Several "solutions" are recommended. Some of them, which kind of helped for me:
Delete the .suo file in your project dir. Eventually need to create your whole solution from scratch.
Close any Windows Form Designers may remain open.
Use a prebuild script, which deletes the target from the output dir.
Disable the VS hosting process.
None of these really fixes the bug. But it may brings the VS back to a usable state - until a true solution is provided by MS (if ever will).
http://social.msdn.microsoft.com/Forums/en/vsdebug/thread/cea5e4b2-5b33-453c-bffb-8da9f1a1fa4a
http://social.msdn.microsoft.com/Forums/en/vbide/thread/cd12f3c7-de96-4353-adce-23975e30933f
I can confirm this bug exists in VS 2012 Update 2 also.
My work-around is to:
Clean Solution (and do nothing else)
Close all open documents/files in the solution
Exit VS 2012
Run VS 2012
Build Solution
I don't know if this is relevant or not, but my project uses "Linked" in class files from other projects - it's a Silverlight 5 project and the only way to share a class that is .NET and SL compatible is to link the files.
Something to consider ... look for linked files across projects in a single solution.
This is happening because [yourProjectName].exe process is not closing after finishing debugging.
There are two solutions to this problem.
Every time you make change to application, Go to Task Manager -> Processes -> [yourProjectName].exe, end this process. You have to end this process every time you make changes to system.
Add a exit button in your application to exit window and add these line to click event
System.Diagnostics.Process.GetCurrentProcess().Kill();
Application.Exit();
If you look in the obj directory, and you don't see your .exe, it's possible that Avast! or other antivirus is deleting it. I would actually see the .exe show up and then disappear. As soon as I turned off Avast!, problem solved.
VS2010 throwing "Could not copy the file "obj\x86\Debug\[file].exe" because it was not found."
The real problem isn't the error you're getting; it's that the application isn't cleaning up after itself.
It's either holding on to references, not freeing resources, or something else that's causing the process to not end when it's being told to close. Fix up that issue and this problem will resolve itself. We can't really help you with that unless you post your code (and at this point, if you need help with that, you should start a new question).
I had to go into windows explorer and delete the bin/debug folder as well as the obj/debug folders. Then I cleaned & rebuilt the project.
Close your project
Delete bin folder
i find it work, :)
Rename the assembly to a different name to solve this issue.
After seeing a similar error in visual studios 2012 out of no where. I have found that that going to the root folder of the project and right clicking on it I unchecked read only and this error went away. Apparently TFS sometimes will made a folder read only. Hopefully this will help anyone with a similar issue. Thanks
This happened to me at VS 2010 and Win 7..
Case :
I can not Rebuild with Debug Configuration manager, but I can rebuild with Release Configuration manager
What I have tried:
Check my account type at control panel - user account --> My Account is Administrator
Set the bin folder not read only
Add security at bin folder to Everyone
stop the iis server
Stop antivirus, check ridiculous running program using task manager and ProcessExplorer
run VS as administrator
If All that way is still not working.
Then, the last way to try:
close solution
close visual studio
start - shutdown
press power button to turn on the computer
login to your account which has administrator previlege at user type
reopen solution
rebuild
that way working. All people call this way as Reset Computer
Mine got solved by:
Clean solution
Close all processes depending on VS (Current instances).
Rebuild
I had same problem, after read your answers , went to Task Manager and searched for app.exe because i believe maybe it doesn't close .
And found it , select it and do END TASK .my problem solved.
Before rebuild the solution, clear the project, stop the IIS and open the "bin" folder property. Uncheck the Read-only Attribute in general tab then rebuild.
I found that ending all msbuild.exe tasks (in Task Manager) fixed the issue with VS2012.
I struggeled with this since years.
I finally downloaded LockHunter to find out who locked the file.
In my case it was MBAM.
Once I added my project's directory to MBAMs exclusion list, I didn't have this problem anymore.
I too had the same issue. I resolved it
Closed my VS, then in Task Manager, End tasks like Microsoft VisualStudio WCF Tools, MSBuild.exe
Then open VS and clean and rebuild.
No matter what the cause of this problem is, the only working solution for me is the following:
Go to Your-Project-Properties -> Application tab(first tab) -> Change the Assembly name.
This way your app creates a new assembly file each time you change the assembly name.
Finally, after you finish to develop, you can delete all those extra assembly files and just keep the last one (main one). Non of the other solutions worked for me, except this one.
Run Visual Studio as Administrator
We recently experienced this on a WinPhone 8 project, in VS 2012 Update 2.
Inexplicably, the cause was using the Tuple type. Removing the code that used a Tuple the problem went away. Add the code back the problem returned.
This will Sound crazy, when ever i build the project the error will be displayed and the avast antivirus will show it as malicious attempt and the project does not run.i just simply disable my antivirus and build my solution again the missing .EXE file has been Created and the project has been successfully executed.
Or you can try this
Visual Studio build fails: unable to copy exe-file from obj\debug to bin\debug
I solved this by killing XDesProc which had a handle on the DLL it couldn't delete.
Well i have the same problem, my way to fix it was to stop and disable the "application experience" service in Windows.
Not a direct answer to your question..
One scenario when this can come is listed below -
If your application is under Debugging process - say by "Attach to Process" debugging, this error may come
If this error was encountered, you can proceed as the following
End the msbuild.exe task
End the explorer.exe task
Run the explorer.exe task again
for me it was the antivirus. Just add visual studio project or entire parent folder to Antivirus exclusion list or you can also add file extension as exclusion and this method worked for me in visual studio 2010/2012
Solution1:
Close the project.
Delete the bin folder.
Open the project.
Build the project.
Solution2:
Add the following code in pre-build event:
attrib -r $(OutDir)*..\* /s
This command line code will remove the ready-only attribute of "bin" folder. Now visual studio can easily delete and copy new dlls.
A very simple solution is to open the Task Manager (CTRL + ALT + DELETE), go to Processes tab and search by name the processes with your project name that are still running. Kill all the processes and go on ! :)
after day with search and build and rebuild i found that you just need to turn off turn on the visual studio its look like it catch the service in different thread
My Visual studio 2019 suddenly stops and restarts and then when i run project this error comes.
I resolve this issue by going into my project folder and delete bin and obj folder
Then clean and rebuild my project. This resolve my issue.