Build error - cannot move file to \lib

[EvAlex]

Unable to move file "bin\Debug\CalcBinding.dll" to "bin\Debug\lib\CalcBinding.dll". Cannot create a file when that file already exists.

Clean, rebuild have no effect as the \lib folder is not removed on clean.

CalcBinding is a nuget package BTW.

[EvAlex]

Turned out that file was held by vshost. I've managed to delete it only after closing Visual Studio.

But still something can be done: don't move file to lib if it is already there?

[Yukinyaa]

I ran into this problem to this problem too. The problem could be solved very easily manually but is very troublesome. Could make some effort to fix this

[trigger-segfault]

Just encountered this problem as well. A quick method that I used was ending the Program.vshost.exe process.

[trigger-segfault]

Apparently ending the process does not permanently fix the issue. My issue also won't go away. Every time I build after a successful build I get the issue with the same dll: System.IO.Compression.dll.

Reopening Visual Studio did not fix the issue.

Alright, final solution:

• Open your .csproj file and goto the Move task in the build actions section.
• Append ContinueOnError="WarnAndContinue" to the end of the tag.

Should now look like this:

  <Target Name="AfterBuild">
    <ItemGroup>
      <MoveToLibFolder Include="$(OutputPath)*.dll ; $(OutputPath)*.pdb ; $(OutputPath)*.xml" />
    </ItemGroup>
    <Move SourceFiles="@(MoveToLibFolder)" DestinationFolder="$(OutputPath)lib" OverwriteReadOnlyFiles="true" ContinueOnError="WarnAndContinue"/>
  </Target>

This of course, will only work if the dlls causing the problem are not being modified. And don't need to be recopied if they already exist.