Enable to access dll because it is being used by another process.

[rmarinho]

Description

The MAUI repository on net6 used parallel builds to build faster. When moving to .net7.0 we found a couple of issues and had to disable the build in parallel solution wide while we worked on these problems.

One of the last remaining problems only happens when build MauiRazorClassLibrarySample in Release mode and seems to be only on macOS. It complains it can't copy the MauiRazorClassLibrarySample.dll to the bin folder.

Steps to Reproduce

1 - Clone MAUI
2- Checkout the main
3 - Remove the line on MauiRazorClassLibrarySample.csproj <BuildInParallel Condition="'$(Configuration)' == 'Release'">false</BuildInParallel>
4 - Build on release mode on macOS

Link to public reproduction project repository

https://github.com/dotnet/maui/

Version with bug

7.0 (current)

Last version that worked well

6.0.424

Affected platforms

I was not able test on other platforms

Affected platform versions

Did you find any workaround?

Set BuildInParallel to false on MauiRazorClassLibrarySample

Relevant log output

Users/builder/azdo/_work/2/s/bin/dotnet/sdk/7.0.100/Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "obj/Release/net7.0/MauiRazorClassLibrarySample.dll" to "bin/Release/net7.0/MauiRazorClassLibrarySample.dll". Beginning retry 1 in 1000ms. The process cannot access the file '/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/bin/Release/net7.0/MauiRazorClassLibrarySample.dll' because it is being used by another process.  [/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/MauiRazorClassLibrarySample.csproj]
/Users/builder/azdo/_work/2/s/bin/dotnet/sdk/7.0.100/Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "obj/Release/net7.0/MauiRazorClassLibrarySample.dll" to "bin/Release/net7.0/MauiRazorClassLibrarySample.dll". Beginning retry 2 in 1000ms. The process cannot access the file '/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/bin/Release/net7.0/MauiRazorClassLibrarySample.dll' because it is being used by another process.  [/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/MauiRazorClassLibrarySample.csproj]
/Users/builder/azdo/_work/2/s/bin/dotnet/sdk/7.0.100/Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "obj/Release/net7.0/MauiRazorClassLibrarySample.dll" to "bin/Release/net7.0/MauiRazorClassLibrarySample.dll". Beginning retry 3 in 1000ms. The process cannot access the file '/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/bin/Release/net7.0/MauiRazorClassLibrarySample.dll' because it is being used by another process.  [/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/MauiRazorClassLibrarySample.csproj]
/Users/builder/azdo/_work/2/s/bin/dotnet/sdk/7.0.100/Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "obj/Release/net7.0/MauiRazorClassLibrarySample.dll" to "bin/Release/net7.0/MauiRazorClassLibrarySample.dll". Beginning retry 4 in 1000ms. The process cannot access the file '/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/bin/Release/net7.0/MauiRazorClassLibrarySample.dll' because it is being used by another process.  [/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/MauiRazorClassLibrarySample.csproj]
/Users/builder/azdo/_work/2/s/bin/dotnet/sdk/7.0.100/Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "obj/Release/net7.0/MauiRazorClassLibrarySample.dll" to "bin/Release/net7.0/MauiRazorClassLibrarySample.dll". Beginning retry 5 in 1000ms. The process cannot access the file '/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/bin/Release/net7.0/MauiRazorClassLibrarySample.dll' because it is being used by another process.  [/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/MauiRazorClassLibrarySample.csproj]
/Users/builder/azdo/_work/2/s/bin/dotnet/sdk/7.0.100/Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "obj/Release/net7.0/MauiRazorClassLibrarySample.dll" to "bin/Release/net7.0/MauiRazorClassLibrarySample.dll". Beginning retry 6 in 1000ms. The process cannot access the file '/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/bin/Release/net7.0/MauiRazorClassLibrarySample.dll' because it is being used by another process.  [/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/MauiRazorClassLibrarySample.csproj]
/Users/builder/azdo/_work/2/s/bin/dotnet/sdk/7.0.100/Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "obj/Release/net7.0/MauiRazorClassLibrarySample.dll" to "bin/Release/net7.0/MauiRazorClassLibrarySample.dll". Beginning retry 7 in 1000ms. The process cannot access the file '/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/bin/Release/net7.0/MauiRazorClassLibrarySample.dll' because it is being used by another process.  [/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/MauiRazorClassLibrarySample.csproj]
/Users/builder/azdo/_work/2/s/bin/dotnet/sdk/7.0.100/Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "obj/Release/net7.0/MauiRazorClassLibrarySample.dll" to "bin/Release/net7.0/MauiRazorClassLibrarySample.dll". Beginning retry 8 in 1000ms. The process cannot access the file '/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/bin/Release/net7.0/MauiRazorClassLibrarySample.dll' because it is being used by another process.  [/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/MauiRazorClassLibrarySample.csproj]
/Users/builder/azdo/_work/2/s/bin/dotnet/sdk/7.0.100/Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "obj/Release/net7.0/MauiRazorClassLibrarySample.dll" to "bin/Release/net7.0/MauiRazorClassLibrarySample.dll". Beginning retry 9 in 1000ms. The process cannot access the file '/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/bin/Release/net7.0/MauiRazorClassLibrarySample.dll' because it is being used by another process.  [/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/MauiRazorClassLibrarySample.csproj]
/Users/builder/azdo/_work/2/s/bin/dotnet/sdk/7.0.100/Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "obj/Release/net7.0/MauiRazorClassLibrarySample.dll" to "bin/Release/net7.0/MauiRazorClassLibrarySample.dll". Beginning retry 10 in 1000ms. The process cannot access the file '/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/bin/Release/net7.0/MauiRazorClassLibrarySample.dll' because it is being used by another process.  [/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/MauiRazorClassLibrarySample.csproj]
/Users/builder/azdo/_work/2/s/bin/dotnet/sdk/7.0.100/Microsoft.Common.CurrentVersion.targets(4752,5): warning MSB3026: Could not copy "obj/Release/net7.0/MauiRazorClassLibrarySample.pdb" to "bin/Release/net7.0/MauiRazorClassLibrarySample.pdb". Beginning retry 1 in 1000ms. The process cannot access the file '/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/bin/Release/net7.0/MauiRazorClassLibrarySample.pdb' because it is being used by another process.  [/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/MauiRazorClassLibrarySample.csproj]
/Users/builder/azdo/_work/2/s/bin/dotnet/sdk/7.0.100/Microsoft.Common.CurrentVersion.targets(4752,5): warning MSB3026: Could not copy "obj/Release/net7.0/MauiRazorClassLibrarySample.pdb" to "bin/Release/net7.0/MauiRazorClassLibrarySample.pdb". Beginning retry 2 in 1000ms. The process cannot access the file '/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/bin/Release/net7.0/MauiRazorClassLibrarySample.pdb' because it is being used by another process.  [/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/MauiRazorClassLibrarySample.csproj]
/Users/builder/azdo/_work/2/s/bin/dotnet/sdk/7.0.100/Microsoft.Common.CurrentVersion.targets(4752,5): warning MSB3026: Could not copy "obj/Release/net7.0/MauiRazorClassLibrarySample.pdb" to "bin/Release/net7.0/MauiRazorClassLibrarySample.pdb". Beginning retry 3 in 1000ms. The process cannot access the file '/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/bin/Release/net7.0/MauiRazorClassLibrarySample.pdb' because it is being used by another process.  [/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/MauiRazorClassLibrarySample.csproj]
/Users/builder/azdo/_work/2/s/bin/dotnet/sdk/7.0.100/Microsoft.Common.CurrentVersion.targets(4752,5): warning MSB3026: Could not copy "obj/Release/net7.0/MauiRazorClassLibrarySample.pdb" to "bin/Release/net7.0/MauiRazorClassLibrarySample.pdb". Beginning retry 4 in 1000ms. The process cannot access the file '/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/bin/Release/net7.0/MauiRazorClassLibrarySample.pdb' because it is being used by another process.  [/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/MauiRazorClassLibrarySample.csproj]
/Users/builder/azdo/_work/2/s/bin/dotnet/sdk/7.0.100/Microsoft.Common.CurrentVersion.targets(4685,5): error MSB3027: Could not copy "obj/Release/net7.0/MauiRazorClassLibrarySample.dll" to "bin/Release/net7.0/MauiRazorClassLibrarySample.dll". Exceeded retry count of 10. Failed.  [/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/MauiRazorClassLibrarySample.csproj]
/Users/builder/azdo/_work/2/s/bin/dotnet/sdk/7.0.100/Microsoft.Common.CurrentVersion.targets(4685,5): error MSB3021: Unable to copy file "obj/Release/net7.0/MauiRazorClassLibrarySample.dll" to "bin/Release/net7.0/MauiRazorClassLibrarySample.dll". The process cannot access the file '/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/bin/Release/net7.0/MauiRazorClassLibrarySample.dll' because it is being used by another process. [/Users/builder/azdo/_work/2/s/src/BlazorWebView/samples/MauiRazorClassLibrarySample/MauiRazorClassLibrarySample.csproj]
    14 Warning(s)
    2 Error(s)

[homeyf]

Verified this issue with VSM 17.6.5 (build 417). Not repro on mac OS and build successfully with sample project.
https://github.com/dotnet/maui/

[ghost]

Hi @rmarinho. We have added the "s/try-latest-version" label to this issue, which indicates that we'd like you to try and reproduce this issue on the latest available public version. This can happen because we think that this issue was fixed in a version that has just been released, or the information provided by you indicates that you might be working with an older version.

You can install the latest version by installing the latest Visual Studio (Preview) with the .NET MAUI workload installed. If the issue still persists, please let us know with any additional details and ideally a reproduction project provided through a GitHub repository.

This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.

[rmarinho]

This is still an issue on our repo.