Edit and Continue Changes are not allowed when

Question

Even if I create a clean WinForms project  Edit and Continue doesn t work and gives me the error   Changes are not allowed when the debugger has been attached to an already running process or the code being debugged was optimized at build or run time    Edit and Continue option is checked in Tools   Options   Debugging  Optimization is not enabled  Seems like there is no any managed profiler set up  I am running in Debug mode I am running on x64 CPU and Windows XP 32-bit  but setting platform target to x86 rather than AnyCpu doesn t help  Repairing Visual Studio installation doesn t help   I also found this article on MSDN website   Unsupported Scenarios Edit and Continue is not available in the following debugging scenarios   Debugging on Windows 98   Mixed-mode  native managed  debugging   SQL debugging   Debugging a Dr  Watson dump   Editing code after an unhandled exception  when the  quot Unwind the call stack on unhandled exceptions quot  option is not selected   Debugging an embedded runtime application   Debugging an application with Attach to rather than running the application with Start from the Debug menu   Debugging optimized code   Debugging managed code when the target is a 64-bit application  If you want to use Edit and Continue  you must set the target to x86   Project Properties  Compile tab  Advanced Compiler setting     Debugging an old version of your code after a new version failed to build due to build errors     But I can answer  quot No quot  to every item in this list  It worked before  but several days ago it stopped working  and I don t know what could be the reason

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VS2019 - ASP NET Forms In my case was Tools - Options - Windows Forms Designer -  quot Optimized Code Generation quot   lt - to false

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what worked for me was unchecking  Use Managed Compatibility Mode  under     Tools -  Options -  Debugging   TBN  checking or unchecking  Require source file to exactly match the original version  seems not influences the E amp C  Hope this can help

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Seems illogic  but only way was disabling edit and continue from VS 2017 options    Then AspNet edit and continue began to work

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For me  it was happening after I had hit a breakpoint  had done some edits  then continued on stepping through the code  then finally hit F5 or  Continue  to get to the end and out of my code block     After trying the  delete all breakpoints  option  Ctrl Shift PrtScn and OK on the prompt  and doing a Rebuild All  I still had an error in my Error Log with regard to my DLL for my project not loading     Can t apply changes  x DLL not loaded    After restarting Visual Studio  all was fine again  For me  it turned out to be just this simple    Other things here did not work for me  like  Require source files to exactly match the original version  was checked before and after things started working again just fine  and targeting  Any CPU  on my x64 machine is just fine  too  did not need to specify x86 or x64   I had  Enable Edit and Continue  enabled in my Tools   Options   Debugging and in my Project Properties    Web  tab settings

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I had this problem in Microsoft Visual Studio 2008 and the solution is easy  when you run your project please set in  Debug  mode not  Release   The another people solution can be useful

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Following shooting helped me using VS2010   go to Tools  Options  Debugging  General and make sure  Require source files to exactly match the original version  is unchecked

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If you re debugging an ASP NET application  go to properties   web   Servers  and make sure that  enable and continue  is checked under Use Visual Studio Development Server

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In my case just reseting to default debugger settings and setting IntelliTrace-  only intellytrace events helps

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The error says a possible cause is   the code being debugged was optimized at build or run time   Go to Project Properties- Debug and uncheck the Optimize Code box for Debug mode

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If I create a new project  edits while debugging do not work   If I create a new website  edits while debugging work as expected

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I removed a dataset from my project because I didn t use it  After that I could modify the program when debugging

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I finally got to solve the problem  UNINSTALL Gallio   Gallio seems to have quite some many rough edges and it s better to not use MbUnit 3 0 but use the MbUnit 2 0 framework but use the gallio runner  that you are running without installing from the installer  which also installed a visual studio plugin    Incidentally  I had the issue even after  disabling  he Gallio plugin  Only the uninstall solved the problem   PS  Edited by nightcoder  In my case disabling TypeMock Isolator  mocking framework  finally helped  Edit  amp  Continue now works     Here is the answer from TypeMock support      After looking further into the edit   and continue issue  and conversing   about it with Microsoft  we reached   the conclusion it cannot be resolved   for Isolator  Isolator implements a   CLR profiler  and according to our   research  once a CLR profiler is   enabled and attached  edit and   continue is automatically disabled    I m sorry to say this is no longer   considered a bug  but rather a   limitation of Isolator

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I found that even though under project properties build  amp  debug tab are set to Debug and all the other setting are correct I still get the message  however after digging some more under the Build menu select Configurations Manager    and make sure Debug is selected in two places there as well  go figure   how many different places do they need to set debug       even though you set Project - Configuration to Debug then under Build - Manager it is not changed so you have change the same setting there as well Project Configuration - seems like a microsoft issue again

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I was facing the same problem in Visual Studio 2005  My configuration is 64 bits  It was working fine on one of the VS solution but not the other  I noticed i only enabled  Enable edit and continue  for the project where i wanted to make changes in debug mode  This finally solved for me when I selected  Enable and Continue  for my start up project as well   There was no configuration changes except the enable and continue needed

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Other Applicable Solutions  Below is an incomplete  unordered list of possible solutions to try if you  are trying to fix Edit  amp  Continue quickly    Make sure you are in Debug Mode Make sure you re not launching a mixed mode process Try to set the CPU target to x86 rather than AnyCPU  on x64 machines  Uncheck the Optimize Code checkbox for Debug Mode in Project Properties- Debug Uncheck Enable Optimizations in Advanced Compiler Settings  ASP NET  Check nightcoder s answer if it is the case  ASP NET  Check this answer  by matrixugly  if it is the case   ASP NET  Ensure you have Edit and Continue enabled on the Web tab  vs2010   ASP NET  Go to Properties   Web   Servers  and make sure that Enable and continue is checked under Use Visual Studio Development Server   ASP NET WebAPI  Make sure you ve stopped in the Controller s method using a breakpoint  before trying to edit it   vs2017  Go to Tools   Options   Debugging and uncheck  deselect   Edit and Continue   This is actually the opposite of the  conventional  advice  see some other points in this post   It does not allow you to actually make changes in your running program  i e  it does not hot-swap the code changes that you make  - it simply allows you to edit your code  i e  it prevents that annoying message and  locking  your editor   Go to Tools   Options   Debugging   General and make sure Require source files to exactly match the original version is unchecked  Check Enable Windows debug heap allocator  Native only   VS Community 2017  Are you using Microsoft Fakes  It inhibits Edit  amp  Continue  Kill all the   vshost exe instances by selecting End Process Tree in the Task Manager  VS will regenerate a correct instance  Remove all the breakpoints with Debug- Delete All Breakpoints Enable and Continue exists in both the Tools   Options   Debugging menu and also in the Project Settings  Be sure to check both places  edit  amp  Continue is not supported with the extended Intellitrace setting  Be sure Debug Info in Project Properties   Build   Advanced   Output   Debug Info is set to Full Some plugin may be interfering  Check by disabling uninstalling and then trying again the other solutions  If you re not paying enough attention  the error you get while trying to fix this may change to something else that is easier to diagnose  E g  A method containing a lambda expression cannot support edit and continue  Make sure the System variable COR ENABLE PROFILING is not set to 1  Some profilers set this when installing and leave it like that after uninstalling  Open a command prompt and type set to quickly check it your system is affected  if so remove the variable or set it to 0    In Windows 8 and above  search for System  Control Panel   Click the Advanced system settings link  Click Environment Variables  Remove COR ENABLE PROFILING  Be aware of unsupported scenarios  as reported in the question  and that unsupported edits        by  you   I mean the visitor of the page who is hammering his head on a keyboard to find The solution     Feel free to edit this answer to add your workaround if not listed here

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For me  for a reason that I don t understand  the setting  Generate debug info  in the  Advanced Compiler Settings  was set to  pdb-only  instead of  Full    By default  this parameter is always set to  Full  but a mysterious poltergeist has changed this parameter on last night      P S  I m in Visual Basic  Net with Visual Studio 2010

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Edit and Continue   when enabled  will only allow you to edit code when it is in break-mode  e g  by having the execution paused by an exception or by hitting a breakpoint   This implies you can t edit the code when the execution isn t paused  When it comes to debugging  ASP NET  web projects  this is very unintuitive  as you would often want to make changes between requests  At this time  the code your  probably  debugging isn t running  but it isn t paused either  To solve this  you can click  Break all   or press Ctrl Alt Break   Alternatively  set a breakpoint somewhere  e g  in your Page Load event   then reload the page so the execution pauses when it hits the breakpoint  and now you can edit code  Even code in  cs files

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I did all the changes mentioned in every other answer and none worked  What did I learn  Enable and Continue exists  in both the Tools    Options   Debugging menu and also in the Project settings  After I checked both  Enable and Continue worked for me

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Some things that seemed to help using VS2010    go to Tools  Options  Debugging  General and make sure  Require source files to exactly match the original version  is unchecked  multiple  vshost exe instances can be left over from e g  detaching the VS debugger from a stopped process   This will interfere with breakpoints and compiles as well   Use Task Manager  Processes tab to kill all instances of  vshost exe by right-clicking each instance and selecting End Process Tree   VS will create a new instance

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For VS2017 it can help to remove the  suo file in your solution  it worked for me

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If your concern is with an ASP NET app  ensure you have edit and continue enabled on the web tab  vs2010   There was also a separate setting for ASP NET debugging in earlier versions   Regards   Adam

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None of the above solutions worked for me running on a 64x machine    Finally I clicked on  advanced compiler settings  and UNCHECKED  enable optimizations  and I can now step through code and edit while debugging

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This problem is due to Intellitrace setting  If Intellitrace is enabled make sure Intellitrace event only is checked  Otherwise this will not allow edit and continue    If you will click on Intellitrace options you will see the warnings

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embed interop types visual studio should be set to false

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Couple of things to check   Make sure your compile is set to Debug vs  Release Make sure you re not launching a mixed mode process If on a 64 bit machine Make sure to set the CPU target to x86 rather than AnyCPU   EDIT   I don t believe this should matter but make sure that the hosting process is enabled for the target platform   Probably won t help     If it repros for new projects then it might be something even more subtle   I would try the following      Backup HKCU  Software Wow6432Node VisualStudio 9 0  maybe just rename it  Delete the same key Try the repro again

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Enable edit and Continue only work run IIS Express  Don t work in Local ISS or External Host

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Had this problem in Rider   I had opened the  csproj file directly instead of the  sln file   The consequence is that the runtime configuration was not set to debug even though I clicked the debug button   You ll notice it says  lt No Configurations gt  in the toolbar beside the debug button

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I had this happen in a linked class file  The rest of the project allowed E amp C  but I got the same error editing the linked file  Solution was to break linked file into it s own project and reference the project

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I faced the same problem  My problem was that I could modify a file  but not another  both are in same project   Later I found that the file I couldn t modify was also part of another project  That another project  Unit Test  wasn t loaded  and intelligent VS debugger shows the error that assembly for this given file was not loaded  and changes aren t allowed  How weird   Hence  I had to unload the unit-test project and continue the EnC debugging

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I had this annoying issue since I upgraded my VS 2019 to 16 4 3 and caused me a lot of headache  Finally I solved the problem this way  1  Stop Debugging 2  Select the solution from  Solution Explorer  3  In the Properties window change the  Active config  Property From  Release Any CPU  To  Debug Any CPU  4  In Debug   Options   General Check the Edit and Continue checkbox That worked for me  and hope it works for you too

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I had the same problem  I even re-installed VS 2008 but the problem did not go away  However  when I deleted all the break points then it started to work    Debug- gt Delete All Breakpoints   I think it was happening because I had deleted an aspx page that had break points in its code  and then I created another page with the same name  This probably confused the VS 2008

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I m adding my answer because the thing that solved it for me isn t clearly mentioned yet  Actually what helped me was this article   http   www rubencanton com blog 2012 02 how-to-fix-error-changes-are-not-allowed-while-code-is-running-in-net html  and here is a short description of the solution    Stop running your app  Go to Tools   Options   Debugging   Edit and Continue Disable    Enable Edit and Continue      Note how counter-intuitive this is  I had to disable  uncheck   Enable Edit and Continue    This will then allow you to change code in your editor without getting that message  Changes are not allowed while code is running    Note however that the code changes you make will NOT be reflected in your running program - for that you need to stop and restart your program  off the top of my head I think that template ASPX changes do get reflected  but not VB C  changes  i e   code behind  code

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That happens when the debugger hasn t hit a breakpoint or you haven t hit Break All  pause    It couldn t be that simple could it

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I ran into this today - turns out that having Debug Info set to pdb-only  or none  I d imagine  will prevent Edit and Continue from working   Make sure your Debug Info is set to  full  first   Project Properties   Build   Advanced   Output   Debug Info

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I had a database project in the solution which stopped the webforms project from being editted   I clicked  Unload  on the database project and everything now works sweetly

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I install the stackify  when i enable this on icon tray  it stop my debugging with edit  so i found   Close the visual studio   in my case its vs2017 Go to icon tray and right click on stackify icon and disable  NET Profiler Open Visual studio run application again in debug mode with debugger and it allow me edit while debugging

[visual-studio] Edit and Continue: "Changes are not allowed when..."

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