I just started learning C# a couple hours ago, but have since run into this error.
Ctrl + Shift + P
.NET:Generate Assets for Build and Debug
But when I click it, an error pops up bottom right of the window:
Could not locate .NET Core project. Assets were not generated.
Restarting VS Code solved the problem in my case.
This same thing started happening to me on my mac on vscode. For me, it was because I didn't add my dotnet project to my solution file after I created the solution file and project.
This is essentially how I created my project:
Create empty project folder mkdir RecipeApp && cd RecipeApp
Add Solution File to Project (uses the name of containing folder) dotnet new sln
Create Backend .NET API dotnet new webapi -o API
Then this is the part I forgot to do (which actually solved a few other problems I was having, like I couldn't use the CMD + . feature to auto import classes and assets etc, too):
Add the sub project to the solution file dotnet sln add API
After I added the API subproject to the solution file, I could open the main top level project folder in vscode, and everything started working again.
This issue could be because the launch.json, which ideally should have been populated with the necessary details isn't generated in case. This issue seems to be linked to Omnisharp. If you go through the issue, you understand the root cause more clearly. You may need to perform the steps mentioned in this comment to get around the issue. These steps involve re-configuring the C# extension inside of your VS Code instance.
Alternately, ensure that all the folders which the extensions uses have appropriate access.
If the issue is also involving task.json, take a look at this answer
In my way helped to change the folder name to a name without spaces.
What I recommend doing is pressing "Run" then start debugging, which should open up a launch.json. If you open it, it will have about 17 warnings and then you can delete the warnings. Then, you press f5, which will give you an option to open a tasks.json. Do that and configure all of the tasks for running your project and it should work.
for me it helped to open the project with opening project_name.csproj with vs-code instead of loading the folder
In my case I just uninstall the c# extension and reload the vscode, after I install again (The vscode will ask to install some assets and somethings that miss in the project too).
Changing extension path manually helped me
I have developed an C#, ASP.NET web application in a Windows 7 machine using Visual Studio 2012. Now i had imported the entire project into VS 2017 running on windows 10 machine, and when i try to enter the debugging mode to analyze my code it shows the following error:
I guess the project configurations are conflicting hence it throws this error.
Any suggestions??
The same error happens when Visual Studio solution has selected the wrong Startup Project. The bold project is the designated startup project.
Go to the Solution Explorer > Right click on the correct project and select "Set as StartUp Project" in the context menu.
I also got this error. I ultimately got to know that I was not selecting .sln file.
In VS, you should select .sln file and it automatically loads the complete project structrue is what I learnt.
Selecting .sln file worked for me
These errors are mostly because you are not selecting the .sln or solution file. In your solution explorer tree, double click the solution file and then build and run.
This runs contrary to a users intuition that simply opening a file and running it would work. Consider it a poor user interface. Jet Brains Rider, for instance, does not have this issue.
Change Targeting Platforms with the Configuration Manager and Build the project then try to debug it.I hope this will help you.
Don't export the project folder. upload the .sln file.
It will work.
DLLs cannot be ran/debugged directly. You have to specify host application in the
Configuration Properties>Debugging>Command and then let it load the DLL by itself.
You will most likely need to copy the DLL to the directory searchable by the host application e.g. its root or ./plugins folder.
In the Configuration Properties>Build Events>Post-Build Event>Command Line simply enter something like:
copy "$(TargetPath)" "$(HOST_APP)\plugins"
The Startup Item needs to be a .exe file. It's looking at BusinessLayer.dll because BusinessLayer is currently the Startup Project.
First, build the solution. Then, set the Solution Explorer to folder view and find the .exe in one of you project's /bin folders. Right click on it and set it to the Startup Item.
Finally, click the play button in Visual Studio top bar.
EDIT: Basically the same as Thomas' answer, but I'm pointing out that the "correct project" is the one with the .exe file. I would have commented on his answer, but I have less than 50 rep right now.
I have a WebApi2 application and it references other projects within the solution. One of these includes some files that I want copied on build. These files have their Copy to Output Directory property set to true.
The files are correctly located in the bin folder of their assembly.
However:
After the build I need them to be copied to the App_Data folder of the web application
Included in the files that get published to IIS
Is it possible?
From my experience you are going to have to get your hands dirty with MSBuild. Its been ages since I've used it but you will need to use the Move Task
This is what Visual Studio uses in the background to build the projects. It may seem daunting but is actually pretty simple once you get used to it. There are tons of tutorials online.
Alternatively, and the most straightforward way, is that you include the files in the APP_DATA folder from within the solution.
EDIT: As mentioned by robor78 you will need to call the Move Task in the Post-Build event
Add build events
In Visual Studio -> Solution Explorer -> right click the project -> properties -> go to build events.
Use something like xcopy
Also if click on "Edit Post-Build" you will see a list of useful folders and file names which you can use e.g. $(OutDir)
You can use Xcopy from the Post build event. It is pretty straight forward but will not run if code not changed. So if you update configs etc. you must force the build I beleive.
See here for how to use xcopy.
http://commandwindows.com/xcopy.htm
There are wild cards and all kinds of useful features, but your situation is pretty simple. Just copy from $(ProjectDir)/bin or something like that to a path.
I am new to Visual Studio. I am using VS 2010 and I cannot find the main method of my C# application. After browsing a bit, I found out that it is created during the compilation phase and is located in obj/{Debug/Release} folder. However, I am unable to locate the folder on my system.
My solution explorer and properties window look like this:
And the corresponding directory (path from the properties window in the above picture) doesn't have obj folder.
Can somebody help me locate the obj folder? I want to check the flow of my program.
Any help is greatly appreciated.
Thanks!
I cannot find the main method of my C# application
A web site doesn't have a "main" method. It usually has global initialization hooks, but nothing quite like Main.
It also looks like you've created a "Web Site" project rather than a "Web Application" project - I've never fully understood the difference, but I suspect you may find that a web site project isn't built in quite the same way, so you may never see the output folders you were expecting. In particular, I'm not seeing anything that would correspond to where I'd expect those initialization hooks to be. You may wish to create a new project as an ASP.NET web application instead.
(I'd update to a more modern version of Visual Studio at the same time, if you possibly can. There's a "community" edition of VS2013 or the release candidate for VS2015...)
You have created an empty WebSite not WebApplication so by default in WebSite there is no bin folder until and unless you explicitly add bin folder or you Add Reference to dll;
In WebSite your main folder for code is App_Code folder where all your .cs files are placed.And in WebApplication all of your code is converted in a dll that is placed in bin folder.
This is driving me crazy.
I have a rather large project that I am trying to modify. I noticed earlier that when I typed DbCommand, visual studio did not do any syntax highlighting on it, and I am using using System.Data.Common.
Even though nothing was highlighted, the project seemed to be running fine in my browser. So I decided to run the debugger to see if things were really working as they should be.
Every time the class that didn't do the highlighting is called I get the "the source file is different from when the module was built" message.
I cleaned the solution and rebuilt it several times, deleted tmp files, followed all the directions here Getting "The source file is different from when the module was built.", restarted the web server and still it tells me the source files are different when they clearly are not.
I cannot test any of the code I have written today because of this.
How can the source be different than the binary when I just complied
it?
Is there any way to knock some sense into visual studio, or am
I just missing something?
I got this issue running a console app where the source that was different was the source that had the entry-point (static void Main). Deleting the bin and obj directories and doing a full rebuild seemed to correct this, but every time I made a code change, it would go out-of-date again.
The reason I found for this was:
I had checked "Only build startup projects and dependencies on Run" (Tools -> Options -> Projects and Solutions -> Build and Run)
In Configuration Manager, my start-up project didn't have "Build" checked
(For #2 -> accessible via the toolbar under the 'Debug/Release' drop down list.)
I was just having this same problem, my projects were all in the same solution so they were using Project to Project references, so as one changed the others should have been updated. However it was not the case, I tried to build, rebuild, close VS2010, pulled a new copy from our source control. None of this worked, what I finally ended up trying was right clicking on the project and rebuilding each project individually. That updated the .dlls and .pdb files so I could debug through.
The issue here is that your dll and or your pdb files are not in sync.
Follow these steps
Just delete the bin directory from the project where the DLL is generated.
Re-build the project.
Remove reference from the project that make reference to the DLL.
Include again the reference.
Enjoy.
In addition to these answers I had the same issue while replacing new DLLs with old ones because of the wrong path. If you are still getting this error you may not refer the wrong path for the DLLs. Go to IIS manager and click the website which uses your DLLs. On the right window click Advanced Settings and go to path of the Physical Path folder on File Explorer and be sure that you are using this folder to replace your DLLs.
Some things for you to check:
Have you double checked your project references?
Do you have a Visual Studio started web server still running? Check the system tray and look for a page with a cog icon (you may have more than one):
(source: msdn.com)
Right click and close/exit it. You may have more than one. Can you debug your changes now?
Are you running the debug version but have only built the release version (or vice versa)?
Did the compile actually succeed? I know I've clicked through the "there were errors, do you want to continue anyway?" message a couple of times without realising.
With web services, the problem can be caused by using the Visual Studio "View in Browser" command. This places the service's DLL and PDB files in the bin and obj folders. When stepping into the web service from a client, somehow Visual Studio uses the PDB in the bin (or obj) folder, but it uses the DLL in the project's output build folder. There are a couple workarounds:
Try deleting the DLL and PDB files in the web service bin and obj files.
Try clicking "View in Browser" in Visual Studio.
If you previously got the source file mismatch error, Visual Studio might have added the filename to a black list. Check your solution properties. Choose "Common Properties -> Debug Source Files" on the left side of the dialog box. If your web service source files appear in the field "Do not look for these source files", delete them.
Unload the project that has the file that is causing the error.
Reload the project.
Fixed
I just had this issue.
I tried all the above, but only this worked:
delete the .pdb file for the solution.
delete the offending .obj files (for the file being reported out of sync)
build the solution.
This fixed the issue for all builds moving forward for me.
In Visual Studio 2017 deleting the hidden .vs folder in the resolved this issue for me.
This is how I fixed the problem in Visual Studio 2010:
1) Change the 'Solutions Configurations' option from "Debug" to "Release"
2) Start debugging
3) Stop debugging and switch the 'Solutions Configurations' option back to "Debug"
This worked for me. Step 3 is optional - it was working fine when I changed it to "Release" but I wanted to change it back.
My solution:
I had included an existing project from a different solution in a new solution file.
I did not notice that when the existing project was rebuilt, it was putting the final output into the NEW solution's output directory. I had a linker path defined to look into the OLD solution's output directory.
Switching my project to search in the new solution's output directory fixed this issue for me.
I had this problem, and it turns out I was running my console application as a windows application. Switching the output type back to console fixed the issue.
I had the same problem. To fix it I used the "Release Mode" to debug in VS2013. Which is sufficient for me, because I'm working in a node js\c++ addon.
My problem was that I had two projects in my solution. The second one was a test project used to call the first one. I had picked the path to the references from the bin folder's release folder.
So whenever I made a change to the first project's code and rebuilt it, it would update the dlls in the debug folder but the calling project was pointing to the release folder, giving me the error, "the source file is different from when the module was built."
Once I deleted the reference to the main project's dll in the release folder and set it to the dll in the debug folder, the issue went away.
In my case, the #Eliott's answer doesn't work.
To solve this problem I had Exclude/Include From Project my deficient file, andalso Clean and Rebuild the solution.
After these actions, my file with my last modifications and the debugger are restored.
I hope this help.
solution:-
the problem is:-
if your some projects in a solution , refer to some other projects,
then sometimes the dll of some projects, will not update automatically, whenever you build the solution,
some projects will have previous build dlls, not latest dlls
you have to go manually and copy the dll of latest build project into referenced project
I was using Visual Studio 2013 and I had an existing project under source control.
I had downloaded a fresh copy from source control to a new directory.
After making changes to the fresh copy, when building I received the error in question.
My solution:
1) Open Documents\IISExpress\config\applicationhost.config
2) Update virtualDirectory node with directory to the fresh copy and save.
My problem was that I had a webservice in the project and I changed the build path.
Restoring the default build path solved my issue.
I had this same problem and I followed the majority of the guidance in the other answers posted here, nothing seemed to work for me.
I eventually opened IIS and recycled the application pool for my web application. I have IIS version 8.5.9600, I right-clicked my web application, then: Deploy > Recycle > Recycle application pool > OK.
That seems to have fixed it, breakpoints now being hit as expected. I think that doing this along with deleting the bin and obj folders helped my situation.
Good luck!
I know this is an old question but I just had the same problem and wanted to post here in case it helps someone else. I got a new computer and the IT dept merged my old computer with the new one. When I set up TFS, I mapped a different local path than what I was previously using, to an additional internal drive. The old path still existed from the merged data on my hard drive so I could still build and run. My IIS paths were also pointing to the old directory. Once I updated IIS to the correct path, I was able to debug just fine. I also deleted the old directory for good measure.
I also experienced that. I just open the obj folder on the project and then open the debug folder delete the .pdb file and that's all.
This error also happens if you try to make changes to a source file that is not part of the project.
I was debugging a method from a .dll of another one of my projects, where Visual Studio had quite helpfully loaded the source because the .dll had been built on the same machine and it knew the path to the source. Obviously, changing such a file isn't going to do anything unless you rebuild the referenced project.
Delete all breakpoints.
Rebuild.
Done
At Visual Studio 2015, using C++, what fixed for me the the source file is different from when the module was built problem was
restart Visual Studio.
Check if the location you pointed to using mex() in Matlab is correct (contains lib and obj files which are modified to the last date you compiled the library in Visual studio).
If this is not the case:
Make sure you are compiling Visual studio in a mode that saves .lib files :
properties -> Config properties -> General -> Config type -> static library
properties -> Config properties -> General -> Target extension=.lib (instead of exe)
Make sure the output and intermediate directories match the Matlab directory in
properties -> Config properties -> General -> Output directory
properties -> Config properties -> General -> Intermediate directory
I get this issue when debugging sometimes w/ Visual Studio but when the application is served by IIS. (we have to develop in this form for some complicated reasons that have to do with how the original developer setup this project.)
When I change the file and rebuild, that fixes it a lot of the time. I know that sounds silly, but I was just trying to debug some code to see why it's doing something weird when I haven't changed it in a while, and I tried a dozen things from this page, but it was fixed just by changing the file..
In my case, the problem was that the debugger exe path was pointing to a net5.0 bin folder. I am using net6.0, so I should've updated the exe path back when I updated the target framework. Works fine now.
Debug-> start without debugging.
This option worked for me. Hope this helps!