I am getting this error when pressing F5 in VS Code:

C:\Users\Alex .nuget\packages\microsoft.azure.functions.worker.sdk\2.0.0\build\Microsoft.Azure.Functions.Worker.Sdk.targets(136,5): error MSB4018: The "GenerateFunctionMetadata" task failed unexpectedly.
[C:\Repos\k.Integration.ocommMessages\k.Integration.ocommMessages.csproj]

C:\Users\Alex.nuget\packages\microsoft.azure.functions.worker.sdk\2.0.0\build\Microsoft.Azure.Functions.Worker.Sdk.targets(136,5):
error MSB4018: System.IO.IOException: The process cannot access the file '\?\C: \Repos\k.Integration.ocommMessages\obj\Debug\net8.0\WorkerExtensions' because it is being used by another process. [C:\Repos\k.Integration.ocommMessages\k.Integration.ocommMessages.csproj]

C:\Users\Alex.nuget\packages\microsoft.azure.functions.worker.sdk\2.0.0\build\Microsoft.Azure.Functions.Worker.Sdk.targets(136,5): error MSB4018:
at System.IO.FileSystem.RemoveDirectoryInternal(String fullPath, Boolean topLevel, Boolean allowDirectoryNotEmpty) [C:\Repos\k.Integration.ocommMessages\k.Integration.ocommMessages.csproj] C:\Users\Alex.nuget\packages\microsoft.azure.functions.worker.sdk\2.0.0\build\Microsoft.Azure.Functions.Worker.Sdk.targets(136,5): error MSB4018:
at System.IO.FileSystem.RemoveDirectoryRecursive(String fullPath, WIN32_FIND_DATA& findData, Boolean topLevel) [C:\Repos\k.Integration.ocommMessages\k.Integration.ocommMessages.csproj] C:\Users\Alex.nuget\packages\microsoft.azure.functions.worker.sdk\2.0.0\build\Microsoft.Azure.Functions.Worker.Sdk.targets(136,5): error MSB4018:
at System.IO.FileSystem.RemoveDirectory(String fullPath, Boolean recursive) [C:\Repos\k.Integration.ocommMessages\k.Integration.ocommMessages.csproj] C:\Users\Alex.nuget\packages\microsoft.azure.functions.worker.sdk\2.0.0\build\Microsoft.Azure.Functions.Worker.Sdk.targets(136,5): error MSB4018:
at Microsoft.Azure.Functions.Worker.Sdk.ExtensionsCsprojGenerator.RecreateDirectory(String directoryPath) in D:\a_work\1\s\sdk\Sdk\ExtensionsCsprojGenerator.cs:line 54 [C:\Repos\k.Integration.ocommMessages\k.Integration.ocommMessages.csproj] C:\Users\Alex.nuget\packages\microsoft.azure.functions.worker.sdk\2.0.0\build\Microsoft.Azure.Functions.Worker.Sdk.targets(136,5): error MSB4018:
at Microsoft.Azure.Functions.Worker.Sdk.ExtensionsCsprojGenerator.Generate() in D:\a_work\1\s\sdk\Sdk\ExtensionsCsprojGenerator.cs:line 46 [C:\Repos\k.Integration.ocommMessages\k.Integration.ocommMessages.csproj] C:\Users\Alex.nuget\packages\microsoft.azure.functions.worker.sdk\2.0.0\build\Microsoft.Azure.Functions.Worker.Sdk.targets(136,5): error MSB4018:
at Microsoft.Azure.Functions.Worker.Sdk.Tasks.GenerateFunctionMetadata.Execute() in D:\a_work\1\s\sdk\Sdk\Tasks\GenerateFunctionMetadata.cs:line 53 [C:\Repos\k.Integration.ocommMessages\k.Integration.ocommMessages.csproj] C:\Users\Alex.nuget\packages\microsoft.azure.functions.worker.sdk\2.0.0\build\Microsoft.Azure.Functions.Worker.Sdk.targets(136,5): error MSB4018:
at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute() [C:\Repos\k.Integration.ocommMessages\k.Integration.ocommMessages.csproj] C:\Users\Alex.nuget\packages\microsoft.azure.functions.worker.sdk\2.0.0\build\Microsoft.Azure.Functions.Worker.Sdk.targets(136,5): error MSB4018:
at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask(ITaskExecutionHost taskExecutionHost, TaskLoggingContext taskLoggingContext, TaskHost taskHost, ItemBucket bucket, TaskExecutionMode howToExecuteTask) [C:\Repos\k.Integration.ocommMessages\k.Integration.ocommMessages.csproj]

I created a new function app in VS Code, using .NET 8.0 LTS. I added a .gitignore and a few c# classes. I tried to run it and got the error above. I've restarted VS Code and my machine, but the error persists.

What am I doing wrong?

I've attempted :

dotnet add package Microsoft.Azure.Functions.Worker.Sdk --prerelease
dotnet outdated
dotnet tool install --global dotnet-outdated
dotnet outdated --update

My .csproj looks ok:

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
    <AzureFunctionsVersion>v4</AzureFunctionsVersion>
    <OutputType>Exe</OutputType>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>
  <ItemGroup>
    <FrameworkReference Include="Microsoft.AspNetCore.App" />
    <!-- Application Insights isn't enabled by default. See . -->
    <!-- <PackageReference Include="Microsoft.ApplicationInsights.WorkerService" Version="2.22.0" /> -->
    <!-- <PackageReference Include="Microsoft.Azure.Functions.Worker.ApplicationInsights" Version="2.0.0" /> -->
    <PackageReference Include="Microsoft.Azure.Functions.Worker" Version="2.0.0" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Http" Version="3.2.0" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore" Version="2.0.0" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Sdk" Version="2.0.0" />
  </ItemGroup>
  <ItemGroup>
    <None Update="host.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
    <None Update="local.settings.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      <CopyToPublishDirectory>Never</CopyToPublishDirectory>
    </None>
  </ItemGroup>
  <ItemGroup>
    <Using Include="System.Threading.ExecutionContext" Alias="ExecutionContext" />
  </ItemGroup>
</Project>

Please note that I've tried other Azure Function projects in VS Code that I know were bug free, and now they fail with the same issue.

I am able to open and run this project using Visual Studio 2022 but not vscode.

I am getting this error when pressing F5 in VS Code:

C:\Users\Alex .nuget\packages\microsoft.azure.functions.worker.sdk\2.0.0\build\Microsoft.Azure.Functions.Worker.Sdk.targets(136,5): error MSB4018: The "GenerateFunctionMetadata" task failed unexpectedly.
[C:\Repos\k.Integration.ocommMessages\k.Integration.ocommMessages.csproj]

C:\Users\Alex.nuget\packages\microsoft.azure.functions.worker.sdk\2.0.0\build\Microsoft.Azure.Functions.Worker.Sdk.targets(136,5):
error MSB4018: System.IO.IOException: The process cannot access the file '\?\C: \Repos\k.Integration.ocommMessages\obj\Debug\net8.0\WorkerExtensions' because it is being used by another process. [C:\Repos\k.Integration.ocommMessages\k.Integration.ocommMessages.csproj]

C:\Users\Alex.nuget\packages\microsoft.azure.functions.worker.sdk\2.0.0\build\Microsoft.Azure.Functions.Worker.Sdk.targets(136,5): error MSB4018:
at System.IO.FileSystem.RemoveDirectoryInternal(String fullPath, Boolean topLevel, Boolean allowDirectoryNotEmpty) [C:\Repos\k.Integration.ocommMessages\k.Integration.ocommMessages.csproj] C:\Users\Alex.nuget\packages\microsoft.azure.functions.worker.sdk\2.0.0\build\Microsoft.Azure.Functions.Worker.Sdk.targets(136,5): error MSB4018:
at System.IO.FileSystem.RemoveDirectoryRecursive(String fullPath, WIN32_FIND_DATA& findData, Boolean topLevel) [C:\Repos\k.Integration.ocommMessages\k.Integration.ocommMessages.csproj] C:\Users\Alex.nuget\packages\microsoft.azure.functions.worker.sdk\2.0.0\build\Microsoft.Azure.Functions.Worker.Sdk.targets(136,5): error MSB4018:
at System.IO.FileSystem.RemoveDirectory(String fullPath, Boolean recursive) [C:\Repos\k.Integration.ocommMessages\k.Integration.ocommMessages.csproj] C:\Users\Alex.nuget\packages\microsoft.azure.functions.worker.sdk\2.0.0\build\Microsoft.Azure.Functions.Worker.Sdk.targets(136,5): error MSB4018:
at Microsoft.Azure.Functions.Worker.Sdk.ExtensionsCsprojGenerator.RecreateDirectory(String directoryPath) in D:\a_work\1\s\sdk\Sdk\ExtensionsCsprojGenerator.cs:line 54 [C:\Repos\k.Integration.ocommMessages\k.Integration.ocommMessages.csproj] C:\Users\Alex.nuget\packages\microsoft.azure.functions.worker.sdk\2.0.0\build\Microsoft.Azure.Functions.Worker.Sdk.targets(136,5): error MSB4018:
at Microsoft.Azure.Functions.Worker.Sdk.ExtensionsCsprojGenerator.Generate() in D:\a_work\1\s\sdk\Sdk\ExtensionsCsprojGenerator.cs:line 46 [C:\Repos\k.Integration.ocommMessages\k.Integration.ocommMessages.csproj] C:\Users\Alex.nuget\packages\microsoft.azure.functions.worker.sdk\2.0.0\build\Microsoft.Azure.Functions.Worker.Sdk.targets(136,5): error MSB4018:
at Microsoft.Azure.Functions.Worker.Sdk.Tasks.GenerateFunctionMetadata.Execute() in D:\a_work\1\s\sdk\Sdk\Tasks\GenerateFunctionMetadata.cs:line 53 [C:\Repos\k.Integration.ocommMessages\k.Integration.ocommMessages.csproj] C:\Users\Alex.nuget\packages\microsoft.azure.functions.worker.sdk\2.0.0\build\Microsoft.Azure.Functions.Worker.Sdk.targets(136,5): error MSB4018:
at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute() [C:\Repos\k.Integration.ocommMessages\k.Integration.ocommMessages.csproj] C:\Users\Alex.nuget\packages\microsoft.azure.functions.worker.sdk\2.0.0\build\Microsoft.Azure.Functions.Worker.Sdk.targets(136,5): error MSB4018:
at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask(ITaskExecutionHost taskExecutionHost, TaskLoggingContext taskLoggingContext, TaskHost taskHost, ItemBucket bucket, TaskExecutionMode howToExecuteTask) [C:\Repos\k.Integration.ocommMessages\k.Integration.ocommMessages.csproj]

I created a new function app in VS Code, using .NET 8.0 LTS. I added a .gitignore and a few c# classes. I tried to run it and got the error above. I've restarted VS Code and my machine, but the error persists.

What am I doing wrong?

I've attempted :

dotnet add package Microsoft.Azure.Functions.Worker.Sdk --prerelease
dotnet outdated
dotnet tool install --global dotnet-outdated
dotnet outdated --update

My .csproj looks ok:

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
    <AzureFunctionsVersion>v4</AzureFunctionsVersion>
    <OutputType>Exe</OutputType>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>
  <ItemGroup>
    <FrameworkReference Include="Microsoft.AspNetCore.App" />
    <!-- Application Insights isn't enabled by default. See https://aka.ms/AAt8mw4. -->
    <!-- <PackageReference Include="Microsoft.ApplicationInsights.WorkerService" Version="2.22.0" /> -->
    <!-- <PackageReference Include="Microsoft.Azure.Functions.Worker.ApplicationInsights" Version="2.0.0" /> -->
    <PackageReference Include="Microsoft.Azure.Functions.Worker" Version="2.0.0" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Http" Version="3.2.0" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore" Version="2.0.0" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Sdk" Version="2.0.0" />
  </ItemGroup>
  <ItemGroup>
    <None Update="host.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
    <None Update="local.settings.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      <CopyToPublishDirectory>Never</CopyToPublishDirectory>
    </None>
  </ItemGroup>
  <ItemGroup>
    <Using Include="System.Threading.ExecutionContext" Alias="ExecutionContext" />
  </ItemGroup>
</Project>

Please note that I've tried other Azure Function projects in VS Code that I know were bug free, and now they fail with the same issue.

I am able to open and run this project using Visual Studio 2022 but not vscode.

• c#
• visual-studio-code
• -core
• azure-functions
• -8.0

• @Itallmakescents it runs with visual studio 2022 without issue. – Alex Gordon Commented Nov 18, 2024 at 19:12
• yessir i restarted and no updates – Alex Gordon Commented Nov 18, 2024 at 19:28
• "because it is being used by another process" - yeah, something is locking your file(s), restart your computer and try again. oh, you could try to find whoever locking the file(s) using these - i normally just dig around using process explorer.. – Bagus Tesa Commented Nov 19, 2024 at 1:58
• I do agree with @BagusTesa, that some process is using it or locking it. Try restarting the machine and then also check which process is blocking the folder, then unblock it. – RithwikBojja Commented Nov 19, 2024 at 6:00

1 Answer 1

Try this:

1. Close VS Code
2. Rename your solution file from {filename}.sln to {filename}.sln.old
3. Open VS Code and let the C# Dev Kit generate a new solution file

• If you still see a Worker Extensions project you may need to hand edit the file (see example old and new files below)
• Also, depending on how complex your solution file was, you may need to adjust the new one

I have run into this a lot, but it seemed intermittent. I tried to do some research on this and landed on the solution file, which was created from the C# Dev Kit, causing this issue when [F5] kicks off the dotnet clean and dotnet build commands:

The process cannot access the file
'\?\{drive}:{repoFolder}\obj\Debug\net8.0\WorkerExtensions'
because it is being used by another process.

Also, since changing the solution file I sometimes get a warning like the following if the func.exe process hasn't completely shut down, but the [F5] experience works.

C:\Program Files\dotnet\sdk\9.0.200\Microsoft.Common.CurrentVersion.targets(5901,5):
warning MSB3061: Unable to delete file "{drive}:{repoFolder}\api\bin\Debug\net8.0\{file}".
Access to the path '{drive}:{repoFolder}\api\bin\Debug\net8.0\file' is denied.
The file is locked by: "func ({old PID})"

For reference here are my solution files. Note the additional projects added to accommodate the build of the internal WorkerExtensions projects:

New

VisualStudioVersion = 17.5.2.0
MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "api", "api\api.csproj", "{CBFA08EA-AECE-205F-7B85-326FD0B81BAD}"
EndProject
Global
    GlobalSection(SolutionConfigurationPlatforms) = preSolution
        Debug|Any CPU = Debug|Any CPU
        Release|Any CPU = Release|Any CPU
    EndGlobalSection
    GlobalSection(ProjectConfigurationPlatforms) = postSolution
        {CBFA08EA-AECE-205F-7B85-326FD0B81BAD}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
        {CBFA08EA-AECE-205F-7B85-326FD0B81BAD}.Debug|Any CPU.Build.0 = Debug|Any CPU
        {CBFA08EA-AECE-205F-7B85-326FD0B81BAD}.Release|Any CPU.ActiveCfg = Release|Any CPU
        {CBFA08EA-AECE-205F-7B85-326FD0B81BAD}.Release|Any CPU.Build.0 = Release|Any CPU
    EndGlobalSection
    GlobalSection(SolutionProperties) = preSolution
        HideSolutionNode = FALSE
    EndGlobalSection
    GlobalSection(ExtensibilityGlobals) = postSolution
        SolutionGuid = {FB949F2F-E0BF-4364-B85C-9669C391CD9E}
    EndGlobalSection
EndGlobal

Old

Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio Version 17
VisualStudioVersion = 17.5.002.0
MinimumVisualStudioVersion = 10.0.40219.1
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "api", "api\api.csproj", "{17EF75B5-878E-45C5-B4D4-196B030ED22A}"
EndProject
Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "obj", "obj", "{50606522-073B-4E32-87FD-485E4606AE21}"
EndProject
Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Debug", "Debug", "{21342CEC-2B17-4098-AE3F-CB29A9BF98D5}"
EndProject
Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "net8.0", "net8.0", "{1EAF5CCC-2456-4900-BA08-30ECE6987CB4}"
EndProject
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "WorkerExtensions", "api\obj\Debug\net8.0\WorkerExtensions\WorkerExtensions.csproj", "{6E1DAD9C-19AF-481C-8170-F3EE98ACD556}"
EndProject
Global
    GlobalSection(SolutionConfigurationPlatforms) = preSolution
        Debug|Any CPU = Debug|Any CPU
        Release|Any CPU = Release|Any CPU
    EndGlobalSection
    GlobalSection(ProjectConfigurationPlatforms) = postSolution
        {17EF75B5-878E-45C5-B4D4-196B030ED22A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
        {17EF75B5-878E-45C5-B4D4-196B030ED22A}.Debug|Any CPU.Build.0 = Debug|Any CPU
        {17EF75B5-878E-45C5-B4D4-196B030ED22A}.Release|Any CPU.ActiveCfg = Release|Any CPU
        {17EF75B5-878E-45C5-B4D4-196B030ED22A}.Release|Any CPU.Build.0 = Release|Any CPU
        {6E1DAD9C-19AF-481C-8170-F3EE98ACD556}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
        {6E1DAD9C-19AF-481C-8170-F3EE98ACD556}.Debug|Any CPU.Build.0 = Debug|Any CPU
        {6E1DAD9C-19AF-481C-8170-F3EE98ACD556}.Release|Any CPU.ActiveCfg = Release|Any CPU
        {6E1DAD9C-19AF-481C-8170-F3EE98ACD556}.Release|Any CPU.Build.0 = Release|Any CPU
    EndGlobalSection
    GlobalSection(SolutionProperties) = preSolution
        HideSolutionNode = FALSE
    EndGlobalSection
    GlobalSection(NestedProjects) = preSolution
        {50606522-073B-4E32-87FD-485E4606AE21} = {1979B036-E077-43DD-B1C6-6174578746B1}
        {21342CEC-2B17-4098-AE3F-CB29A9BF98D5} = {50606522-073B-4E32-87FD-485E4606AE21}
        {1EAF5CCC-2456-4900-BA08-30ECE6987CB4} = {21342CEC-2B17-4098-AE3F-CB29A9BF98D5}
        {6E1DAD9C-19AF-481C-8170-F3EE98ACD556} = {1EAF5CCC-2456-4900-BA08-30ECE6987CB4}
    EndGlobalSection
    GlobalSection(ExtensibilityGlobals) = postSolution
        SolutionGuid = {D0ED147E-C3BD-47A8-AA0A-CBF4FC12B486}
    EndGlobalSection
EndGlobal